Benjamin G. Meyer, , , Guillaume Matthews*, , , Robin Scales, , , Nicole C. Mitchell, , , Ed Darnbrough, , , Robert A. House, , , David E. J. Armstrong, , and , Patrick S. Grant,
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Deformation and Tensile Properties of Free-Standing Solvent-Free Electrodes for Li-Ion Batteries
Solvent-free (dry-processed) electrodes offer substantial economic and environmental benefits to Li-ion batteries and are manufactured in a way that requires them to withstand tensile loads during roll-to-roll processing. Electrode sheets comprising graphite particles embedded within a polytetrafluoroethylene (PTFE) polymer fibril network were investigated under tension and exhibited viscoelastic behavior: linear loading, plastic deformation, and sheet failure. The degree of PTFE fibrillation during manufacture impacted final sheet properties, and calendering induced fibril alignment and crystallographic texture and macroscopic mechanical anisotropy. Increasing the PTFE fraction by 3.5 wt % led to remarkable improvements in ultimate tensile strength (+900%) and failure strain (+30%). Increasing electrode temperature (>19 °C) delayed sheet failure as PTFE transformed from a triclinic to hexagonal phase, however, higher temperatures (>80 °C) accelerated failure by fibril elongation, pull-out and widespread fibril fracture.
期刊介绍：
ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.
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