@article{xiao_assessing_2024,

title = {Assessing cathode–electrolyte interphases in batteries},

author = {Jie Xiao and Nicole Adelstein and Yujing Bi and Wenjuan Bian and Jordi Cabana and Corie L. Cobb and Yi Cui and Shen J. Dillon and Marca M. Doeff and Saiful M. Islam and Kevin Leung and Mengya Li and Feng Lin and Jun Liu and Hongmei Luo and Amy C. Marschilok and Ying Shirley Meng and Yue Qi and Ritu Sahore and Kayla G. Sprenger and Robert C. Tenent and Michael F. Toney and Wei Tong and Liwen F. Wan and Chongmin Wang and Stephen E. Weitzner and Bingbin Wu and Yaobin Xu},

url = {https://www.nature.com/articles/s41560-024-01639-y},

doi = {10.1038/s41560-024-01639-y},

issn = {2058-7546},

year  = {2024},

date = {2024-10-07},

urldate = {2024-10-07},

journal = {Nature Energy},

pages = {1–11},

abstract = {The cathode–electrolyte interphase plays a pivotal role in determining the usable capacity and cycling stability of electrochemical cells, yet it is overshadowed by its counterpart, the solid–electrolyte interphase. This is primarily due to the prevalence of side reactions, particularly at low potentials on the negative electrode, especially in state-of-the-art Li-ion batteries where the charge cutoff voltage is limited. However, as the quest for high-energy battery technologies intensifies, there is a pressing need to advance the study of cathode–electrolyte interphase properties. Here, we present a comprehensive approach to analyse the cathode–electrolyte interphase in battery systems. We underscore the importance of employing model cathode materials and coin cell protocols to establish baseline performance. Additionally, we delve into the factors behind the inconsistent and occasionally controversial findings related to the cathode–electrolyte interphase. We also address the challenges and opportunities in characterizing and simulating the cathode–electrolyte interphase, offering potential solutions to enhance its relevance to real-world applications.},

note = {Publisher: Nature Publishing Group},

keywords = {batteries},

pubstate = {published},

tppubtype = {article}

}

@article{katz_high-viscosity_2024,

title = {High-Viscosity Phase Inversion Separators for Freestanding and Direct-on-Electrode Manufacturing in Lithium-Ion Batteries},

author = {Michelle E. R. Katz and Corie L. Cobb},

url = {https://doi.org/10.1021/acsami.4c09342},

doi = {10.1021/acsami.4c09342},

issn = {1944-8244},

year  = {2024},

date = {2024-08-28},

urldate = {2024-08-28},

journal = {ACS Applied Materials & Interfaces},

volume = {16},

number = {34},

pages = {44863–44878},

abstract = {Separators play a critical role in lithium-ion batteries (LIBs) by facilitating lithium-ion (Li-ion) transport while enabling safe battery operation. However, commercial separators made from polypropylene (PP) or polyethylene (PE) impose a discrete processing step in current LIB manufacturing as they cannot be manufactured with the same slot-die coating process used to fabricate the electrodes. Moreover, commercial separators cannot accommodate newer manufacturing processes used to produce leading-edge microbatteries and flexible batteries with customized form factors. As a path toward rethinking LIB fabrication, we have developed a high-viscosity polymer composite separator slurry that enables the fabrication of both freestanding and direct-on-electrode films. A streamlined phase inversion process is used to impart porosity in cast separator films upon drying. To understand the impacts of material composition and rheology on phase inversion processing and separator performance, we investigated four different separator formulations. We used either diethylene glycol (DEG) or triethyl phosphate (TEP) as a nonsolvent, and either silica (SiO2) or alumina (Al2O3) as an inorganic additive in a polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) matrix. Through a down-selection process, we developed a TEP-SiO2 separator formulation that matched or outperformed a commercial Celgard 2325 (PP/PE/PP) separator and a Beyond Battery ceramic-coated PE (CC/PE/CC) separator under rate and cycle life tests in LiFePO4textbarLi4Ti5O12 (LFPtextbarLTO) and LiNi0.5Mn0.3Co0.2O2textbargraphite (NMC-532textbargraphite) coin cells at C/10–1C rates. Our TEP-SiO2 slurry had a viscosity of 298 Pa s at a 1 s–1 shear rate and shear-thinning behavior. When deposited directly onto an LTO anode and cycled against an LFP cathode, the direct-on-electrode TEP-SiO2 separator increased the specific capacity by 58% and 304% at 2C rates relative to the PP/PE/PP and CC/PE/CC separators, respectively. Additionally, the freestanding TEP-SiO2 separator maintained dimensional stability when heated to 200 °C for 1 h and demonstrated a higher elastic modulus and hardness than the PP/PE/PP and CC/PE/CC separators when measured with nanoindentation.},

note = {Publisher: American Chemical Society},

keywords = {additive manufacturing, batteries, printed batteries},

pubstate = {published},

tppubtype = {article}

}

@article{johnson_two-dimensional_2023,

title = {Two-dimensional patterning of mesoscale fibers using acoustophoresis},

author = {Keith E. Johnson and Brandon C. Montano and Kailino J. Nambu and Emilee N. Armstrong and Corie L. Cobb and Matthew R. Begley},

url = {https://www.sciencedirect.com/science/article/pii/S0264127523007438},

doi = {10.1016/j.matdes.2023.112328},

issn = {0264-1275},

year  = {2023},

date = {2023-10-01},

urldate = {2023-10-01},

journal = {Materials & Design},

volume = {234},

pages = {112328},

abstract = {The performance of functional composites can rely critically on the arrangement of secondary phases; for example, patterned networks of conductive particles can impart anisotropic thermal, electric or ionic conductivity while preserving flexibility in the matrix. We demonstrate the use of standing acoustic waves to generate periodic patterns of short fibers. We extend the range of possible patterns with the first demonstration of both rectangular grids and arrays of octagons interspersed with rectangles. These newly demonstrated patterns are rationalized using theoretical models of acoustic forces and torques on fibers that account for two-dimensional spatial variations arising from applied acoustic fields. The models enable simulations of fiber motion, which are used to (i) map out final fiber positions as a function of initial position and orientation, and (ii) corroborate experiments visualizing fiber motion and final patterns. This approach provides a fast and accurate way to predict emergent fiber patterns as a function of excitation modality and fiber length. The theory and experiments clearly indicate strong coupling between the length of the fibers and the spacing of the acoustic nodes. This coupling is used to estimate reductions in percolation thresholds associated with the ratio of fiber length and acoustic wavelength.},

keywords = {acoustic focusing, acoustophoresis, periodic patterns},

pubstate = {published},

tppubtype = {article}

}

@article{johnson_simple_2023,

title = {A simple, validated approach for design of two-dimensional periodic particle patterns via acoustophoresis},

author = {Keith E. Johnson and Drew S. Melchert and Emilee N. Armstrong and Daniel S. Gianola and Corie L. Cobb and Matthew R. Begley},

url = {https://www.sciencedirect.com/science/article/pii/S0264127523005804},

doi = {10.1016/j.matdes.2023.112165},

issn = {0264-1275},

year  = {2023},

date = {2023-07-20},

urldate = {2023-07-01},

journal = {Materials & Design},

pages = {112165},

abstract = {Two-dimensional patterning of microparticles enables a wide range of functional materials, including patterned energy storage electrodes, flexible electronics, and sensor arrays. Particle patterning via acoustics offers an attractive path to generate a wide variety of 2D periodic patterns that introduce tailorable hierarchical porosity, useful for controlling surface area, transport distances, and other properties. This method is most effective with micron scale particles and patterns of tens to hundreds of microns. To enable systematic exploration of the broad design space for such patterns, this work develops a model of 2D and 3D assembly of particles at high loadings and validates the obtained patterns against both experiments and more computationally intensive modeling techniques. Using this simple model, connections are mapped between input parameters (like actuation conditions, particle volume fraction, material properties) and output geometrical features (like void size and shape, pattern connectivity, and surface area) so that they can be tailored to given applications. The utility of this simple model is illustrated by predicting and then experimentally demonstrating new hierarchical patterns resulting from multiple waves of different frequencies interacting. These multiscale patterns offer the potential to lift the limits on surface area, diffusion distances, and other features.},

keywords = {acoustic focusing, architechted materials, periodic patterns},

pubstate = {published},

tppubtype = {article}

}

@article{hung_are_2022,

title = {Are Three-Dimensional Batteries Beneficial? Analyzing Historical Data to Elucidate Performance Advantages},

author = { Chih-Hsuan Hung and Phong Huynh and Katrina Teo and Corie L. Cobb},

url = {https://doi.org/10.1021/acsenergylett.2c02208},

doi = {10.1021/acsenergylett.2c02208},

year  = {2022},

date = {2022-11-01},

urldate = {2022-11-01},

journal = {ACS Energy Letters},

pages = {296-305},

abstract = {Conventional lithium-ion batteries (LIBs) are composed of planar stacks of anodes, cathodes, and separators, all immersed in electrolyte and sandwiched between current collectors. However, planar LIBs have a performance trade-off where increasing electrode thickness leads to higher capacity but lower rate capability. Three-dimensional (3D) batteries circumvent this issue with 3D electrode architecture. Herein, we systematically analyze 3D LIBs from experimental publications over the past 20 years. Using a previously developed empirical model, we obtain parameters to quantify the rate capability and rate-limiting mechanisms of 3D LIBs. Compared to conventional LIBs, 3D LIBs exhibit better rate capability, confirming their expected performance benefit. To provide further insight, we investigate the impact of liquid-phase and solid-phase diffusion mechanisms on this performance benefit. Lastly, we discuss the design landscape of 3D LIBs across multiple electrode designs and material sets and highlight our perspective on the applicability of 3D LIBs at different application scales.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{melchert_anisotropic_nodate,

title = {Anisotropic Thermally Conductive Composites Enabled by Acoustophoresis and Stereolithography},

author = {Drew S. Melchert and Amir Tahmasebipour and Xin Liu and Julie Mancini and Bryan Moran and Brian Giera and Ishan D. Joshipura and Maxim Shusteff and Carl D. Meinhart and Corie L. Cobb and Christopher Spadaccini and Daniel S. Gianola and Matthew R. Begley},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.202201687},

doi = {10.1002/adfm.202201687},

issn = {1616-3028},

year  = {2022},

date = {2022-05-17},

urldate = {2022-05-17},

journal = {Advanced Functional Materials},

pages = {2201687},

abstract = {Opportunities to improve thermal management in electronic devices are currently hindered by processing constraints that limit thermal conductivity in polymer-matrix composites. Active patterning of filler particles is a promising route to improve conductivity while retaining processability by improving particle contact density and directing heat along optimized pathways. This study employs acoustic patterning to align and compact filler particles into stripes during stereolithographic 3D printing. This approach produces polymer-based composite materials with highly efficient embedded heat transport pathways which reach 95 vol% particle utilization (relative to the parallel conduction upper limit). These composites exhibit anisotropic thermal conductivity up to 300% higher than unpatterned composites, with in-plane anisotropy ratios of up to 350%. Combining this high conductivity with 3D printing enables materials with engineered heat networks that optimize transport from hot spots to heatsinks while maintaining low viscosity for fast particle patterning and for infiltration around electronic components. Finally, numerical simulations of acoustic assembly of particles with varied geometry, when compared to experimentally characterized particle packing, illuminate pathways for further improving conductivity by optimizing particle geometry for alignment and stacking of particles with maximum contact surface area.},

keywords = {3D printing, acoustophoresis, composites, stereolithography},

pubstate = {published},

tppubtype = {article}

}

@article{hung_modeling_2021,

title = {Modeling Current Density Non-Uniformities to Understand High-Rate Limitations in 3D Interdigitated Lithium-ion Batteries},

author = {Chih-Hsuan Hung and Srikanth Allu and Corie L Cobb},

url = {https://doi.org/10.1149/1945-7111/ac2ac5},

doi = {10.1149/1945-7111/ac2ac5},

issn = {1945-7111},

year  = {2021},

date = {2021-10-08},

urldate = {2021-10-08},

journal = {Journal of The Electrochemical Society},

volume = {168},

number = {10},

pages = {100512},

abstract = {Conventional planar Lithium-ion battery (LIB) cells are composed of a cathode and an anode with a polymer separator sheet sandwiched in between. Three-dimensional (3D) interdigitated batteries, where an anode and a cathode are intertwined, have been proposed as an alternative to planar LIBs to significantly improve energy, power, and fast charge performance. Various 3D battery designs have been demonstrated by researchers over the years, but a systematic study of how architecture and material impact 3D battery performance has been limited. In this paper, we conduct a comparative 3D computational modeling study on four 3D interdigitated battery designs previously shown in literature. We model each 3D battery using Li4Ti5O12 (LTO)∣LiFePO4 (LFP) and Graphite∣LiNi0.5Mn0.3Co0.2O2 (NMC), two widely studied LIB material systems, while conserving mass across all designs. Moreover, we propose a 3D current density metric to evaluate 3D LIBs and quantify the impact of current non-uniformities on high-rate LIB performance. Our results indicate that material selection and 3D architecture are equally critical for maximizing performance at high discharge rates. In addition, our analysis suggests quantifying the rate of change in current density early in a model discharge cycle can be a guiding metric to screen designs more quickly for premature failure.},

note = {Publisher: The Electrochemical Society},

keywords = {additive manufacturing, battery modeling},

pubstate = {published},

tppubtype = {article}

}

@article{bonnassieux_2021,

title = {The 2021 flexible and printed electronics roadmap},

author = {Yvan Bonnassieux and Christoph J Brabec and Yong Cao and Tricia Breen Carmichael and Michael L Chabinyc and Kwang-Ting Cheng and Gyoujin Cho and Anjung Chung and Corie L Cobb and Andreas Distler and Hans-Joachim Egelhaaf and Gerd Grau and Xiaojun Guo and Ghazaleh Haghiashtiani and Tsung-Ching Huang and Muhammad M Hussain and Benjamin Iniguez and Taik-Min Lee and Ling Li and Yuguang Ma and Dongge Ma and Michael C McAlpine and Tse Nga Ng and Ronald Österbacka and Shrayesh N Patel and Junbiao Peng and Huisheng Peng and Jonathan Rivnay and Leilai Shao and Daniel Steingart and Robert A Street and Vivek Subramanian and Luisa Torsi and Yunyun Wu},

url = {https://doi.org/10.1088/2058-8585/abf986},

doi = {10.1088/2058-8585/abf986},

issn = {2058-8585},

year  = {2021},

date = {2021-05-17},

urldate = {2021-05-17},

journal = {Flexible and Printed Electronics},

volume = {6},

number = {2},

pages = {023001},

abstract = {This roadmap includes the perspectives and visions of leading researchers in the key areas of flexible and printable electronics. The covered topics are broadly organized by the device technologies (sections 1–9), fabrication techniques (sections 10–12), and design and modeling approaches (sections 13 and 14) essential to the future development of new applications leveraging flexible electronics (FE). The interdisciplinary nature of this field involves everything from fundamental scientific discoveries to engineering challenges; from design and synthesis of new materials via novel device design to modelling and digital manufacturing of integrated systems. As such, this roadmap aims to serve as a resource on the current status and future challenges in the areas covered by the roadmap and to highlight the breadth and wide-ranging opportunities made available by FE technologies.},

note = {Publisher: IOP Publishing},

keywords = {printed electronics, wearables},

pubstate = {published},

tppubtype = {article}

}

@article{melchert_modeling_2021,

title = {Modeling meso- and microstructure in materials patterned with acoustic focusing},

author = {Drew S Melchert and Keith Johnson and Brian Giera and Erika J Fong and Maxim Shusteff and Julie Mancini and John J Karnes and Corie L Cobb and Christopher Spadaccini and Daniel S Gianola and Matthew R Begley},

url = {http://www.sciencedirect.com/science/article/pii/S0264127521000654},

doi = {10.1016/j.matdes.2021.109512},

issn = {0264-1275},

year  = {2021},

date = {2021-01-26},

urldate = {2021-01-28},

journal = {Materials & Design},

pages = {109512},

abstract = {We conduct numerical simulations of acoustic focusing in dense suspensions to map the design space of acoustically patterned materials. We develop closed-form expressions for acoustic forces on particles, enabling rapid simulation of thousands of particles, and find excellent agreement with experimentally focused patterns over a range of conditions. We map the geometrical and microstructural features of focused particle patterns and their dependence on processing parameters. We find that mesostructural geometrical features (focused line height, width, and profile shape) can be controlled reliably over a broad range by modulating input parameters, and that while microstructural features are less readily modulated via input parameters, they are well-suited for various transport properties in functional materials. Notably, packing density nears the random close packing limit at 0.64, and particle contact density shows anisotropy favoring particle contacts along the focused lines. These results guide process design for controlling the properties of patterned materials, and outline the property ranges accessible via acoustic focusing. Additionally, we discuss the dependence of material functionalities, particularly electrical, thermal, and ionic transport properties, on the meso- and micro-structural features of patterned composite materials in the context of acoustic focusing.},

keywords = {additive manufacturing, architected materials, composite materials},

pubstate = {published},

tppubtype = {article}

}

@article{hatzell_challenges_2020,

title = {Challenges in lithium metal anodes for solid state batteries},

author = { Kelsey B. Hatzell and Xi Chelsea Chen and Corie L. Cobb and Neil P Dasgupta and Marm B. Dixit and Lauren E Marbella and Matthew T. McDowell and Partha Mukherjee and Ankit Verma and Venkatasubramanian Viswanathan and Andrew Westover and Wolfgang G. Zeier},

url = {https://doi.org/10.1021/acsenergylett.9b02668},

doi = {10.1021/acsenergylett.9b02668},

year  = {2020},

date = {2020-02-18},

urldate = {2020-02-18},

journal = {ACS Energy Letters},

volume = {5},

number = {3},

pages = {922-934},

abstract = {In this perspective, we highlight recent progress and challenges related to the integration of lithium metal anodes in solid-state batteries. While prior reports have suggested that solid electrolytes may be impermeable to lithium metal, this hypothesis has been disproven under a variety of electrolyte compositions and cycling conditions. Herein, we describe the mechanistic origins and importance of lithium filament growth and interphase formation in inorganic and organic solid electrolytes. Multi-modal techniques that combine real and reciprocal space imaging and modeling will be necessary to fully understand non-equilibrium dynamics at these buried interfaces. Currently, most studies on lithium electrode kinetics at solid electrolyte interfaces are completed in symmetric Li-Li configurations. To fully understand the challenges and opportunities afforded by Li metal anodes, full-cell experiments are necessary. Finally, the impacts of operating conditions on solid state batteries are largely unknown with respect to pressure, geometry, and break-in protocols. Given the rapid growth of this community and diverse portfolio of solid electrolytes, we highlight the need for detailed reporting of experimental conditions and standardization of protocols across the community.},

keywords = {batteries},

pubstate = {published},

tppubtype = {article}

}

@article{doi:10.1002/admt.201900452,

title = {3D Printing Ionogel Auxetic Frameworks for Stretchable Sensors},

author = { Jitkanya Wong and Alex T. Gong and Peter A. Defnet and Leire Meabe and Bruce Beauchamp and Robert M. Sweet and Haritz Sardon and Corie L. Cobb and Alshakim Nelson},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/admt.201900452},

doi = {10.1002/admt.201900452},

year  = {2019},

date = {2019-08-08},

urldate = {2019-08-08},

journal = {Advanced Materials Technologies},

volume = {4},

number = {9},

pages = {1900452},

abstract = {Ionogels are an emerging class of soft materials that exhibit ionic conductivity and thermal stability without the need to replenish ions or the addition of conductive particle fillers. An ionogel ink is reported for direct-write 3D printing to fabricate conductive structures that can vary in the printed object geometries. This approach relies on a shear-thinning ionogel ink that can be extruded to afford self-supporting constructs. After a brief UV cure, the printed construct is transformed into a mechanically tough, transparent structure that is ionically conductive. Upon application of stretching and twisting loads, the 3D-printed objects exhibit detectable changes in conductivity. To demonstrate the versatility of rapid prototyping with the ionogel inks, an auxetic structure is 3D printed and tested as a strain sensor. The printed auxetic structure exhibits an electrical response to strain, but also demonstrates increased extensibility and operational range in comparison to a casted bulk film with the same outer dimensions.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{cobb_communicationanalysis_2017,

title = {Communication—Analysis of Thick Co-Extruded Cathodes for Higher-Energy-and-Power Lithium-Ion Batteries},

author = {Corie L Cobb and Scott E Solberg},

url = {https://iopscience.iop.org/article/10.1149/2.0101707jes},

doi = {10.1149/2.0101707jes},

issn = {0013-4651, 1945-7111},

year  = {2017},

date = {2017-01-01},

urldate = {2017-01-01},

journal = {Journal of The Electrochemical Society},

volume = {164},

number = {7},

pages = {A1339--A1341},

abstract = {3-dimensional (3D) electrode architectures have been explored as a means to decouple power and energy trade-offs in thick battery electrodes. Limited work has been published which systematically examines the impact of these architectures at the pouch cell level. This paper conducts an analysis on the potential capacity gains that can be realized with thick co-extruded electrodes in a pouch cell. Our findings show that despite lower active material composition for each cathode layer, the effective gain in thickness and active material loading enables pouch cell capacity gains greater than 10% with a Lithium Nickel Manganese Cobalt Oxide (NMC) materials system.},

keywords = {Co-extrusion},

pubstate = {published},

tppubtype = {article}

}

@article{cobb_additive_2016,

title = {Additive Manufacturing: Rethinking Battery Design},

author = {Corie L Cobb and Christine C Ho},

url = {http://interface.ecsdl.org/content/25/1/75},

issn = {1064-8208, 1944-8783},

year  = {2016},

date = {2016-01-01},

urldate = {2017-09-13},

journal = {The Electrochemical Society Interface},

volume = {25},

number = {1},

pages = {75-78},

abstract = {This article outlines emerging trends in the use of additive manufacturing techniques for the manufacture of batteries with customized geometries. Following a brief overview of conventional battery manufacturing, we discuss additive manufacturing strategies such as extrusion and dispenser printing, ink-jet printing, and screen printing in the context of battery manufacturing, and highlight the pros and cons of each technique. We provide some examples of 2D and 3D battery structures created by additive manufacturing, and highlight current and future research directions for battery design, manufacturing, and integration for small, portable and wearable electronics.},

keywords = {additive manufacturing, printed batteries},

pubstate = {published},

tppubtype = {article}

}

@article{cobb_what_2016,

title = {What Alumni Value from New Product Development Education: A Longitudinal Study},

author = {Corie L Cobb and Jonathan Hey and Alice M Agogino and Sara L Beckman and Sohyeong Kim},

url = {http://advances.asee.org/publication/what-alumni-value-from-new-product-development-education-a-longitudinal-study/},

year  = {2016},

date = {2016-01-01},

urldate = {2018-03-05},

journal = {Advances in Engineering Education},

volume = {5},

number = {1},

abstract = {We present a longitudinal study of what graduates take away from a cross-disciplinary graduate-level New Product Development (NPD) course at UC Berkeley over a 15-year period from 1996-2010. We designed and deployed a longitudinal survey and interviewed a segment of our NPD alumni population to better understand how well our course prepared these alumni for careers in design, innovation, entrepreneurship and product management. We questioned alumni regarding the value of specific NPD skills, methods, and tools taught in the course. This paper presents a quantitative and qualitative analysis of survey and interview data. The results reaffirm the value of engaging students in multidisciplinary design projects as a means for developing the skills needed in today’s competitive NPD environment and highlight the similarities and differences that exist between academic and industry NPD practices. We believe the findings will inform educators about what is valued in NPD courses by graduates now working in industry.},

keywords = {engineering education, new product development},

pubstate = {published},

tppubtype = {article}

}

@article{richter_progress_2015,

title = {Progress in fine-line metallization by co-extrusion printing on cast monosilicon PERC solar cells},

author = {Philipp L Richter and Gerd Fischer and Lamine Sylla and Melanie Hentsche and Stefan Steckemetz and Matthias Müller and Corie L Cobb and Scott E Solberg and Ranjeet Rao and Scott Elrod and Phedon Palinginis and Eric Schneiderlöchner and Holger D Neuhaus},

url = {http://www.sciencedirect.com/science/article/pii/S0927024815002287},

doi = {10.1016/j.solmat.2015.05.023},

issn = {0927-0248},

year  = {2015},

date = {2015-11-01},

urldate = {2018-03-05},

journal = {Solar Energy Materials and Solar Cells},

volume = {142},

pages = {18--23},

series = {Proceedings of the 5th International Conference on Crystalline Silicon Photovoltaics (SiliconPV 2015)},

abstract = {In this paper, we present our progress in co-extrusion printing for fine-line metallization. With this technique, 30µm wide and 20µm tall front grid fingers are currently printed. Applied to industrial size cast silicon PERC solar cells, a world record conversion efficiency of 21.42% has been demonstrated. This result was achieved with a production-ready co-extrusion printer that runs at a throughput of 2700 wafers per hour. Furthermore, a printhead is presented that has been developed to enable co-extrusion printing on pseudo-square wafers. Finally the cost advantage of the technology is discussed.},

keywords = {Co-extrusion, solar},

pubstate = {published},

tppubtype = {article}

}

@article{cobb_modeling_2014,

title = {Modeling mass and density distribution effects on the performance of co-extruded electrodes for high energy density lithium-ion batteries},

author = {Corie L Cobb and Mario Blanco},

url = {http://www.sciencedirect.com/science/article/pii/S0378775313017503},

doi = {10.1016/j.jpowsour.2013.10.084},

issn = {0378-7753},

year  = {2014},

date = {2014-01-01},

urldate = {2017-09-13},

journal = {Journal of Power Sources},

volume = {249},

pages = {357--366},

abstract = {Utilizing an existing macro-homogeneous porous electrode model developed by John Newman, this paper aims to explore the potential energy density gains which can be realized in lithium-ion battery electrodes fabricated with co-extrusion printing technology. This paper conducts an analysis on two-dimensional electrode cross-sections and presents the electrochemical performance results, including calculated volumetric energy capacity for a general class of lithium cobalt oxide (LiCoO2) co-extruded cathodes, in the presence of a lithium metal anode, polymer separator and liquid ethylene carbonate, propylene carbonate, and dimethyl carbonate (EC:PC:DMC) electrolyte. The impact of structured electrodes on cell performance is investigated by varying the physical distribution of a fixed amount of cathode mass over a space of dimensions which can be fabricated by co-extrusion. By systematically varying the thickness and aspect ratio of the electrode structures, we present an optimal subset of geometries and design rules for co-extruded geometries. Modeling results demonstrate that ultra-thick LiCoO2 electrodes, on the order of 150–300 μm, can garner a substantial improvement in material utilization and in turn capacity through electrolyte channels and fine width electrode pillars which are 25–100 μm wide.},

keywords = {battery modeling, Co-extrusion, printed batteries},

pubstate = {published},

tppubtype = {article}

}