Deformation and Tensile Properties of Free-Standing Solvent-Free Electrodes for Li-Ion Batteries

IF 8.7 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Materials Letters Pub Date : 2025-09-12 DOI:10.1021/acsmaterialslett.5c00947

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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Abstract

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.

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锂离子电池独立式无溶剂电极的变形和拉伸性能

无溶剂（干法加工）电极为锂离子电池提供了可观的经济效益和环境效益，并且其制造方式要求它们在卷对卷加工过程中承受拉伸载荷。在聚四氟乙烯（PTFE）聚合物纤维网络中嵌入石墨颗粒的电极片在张力下进行了研究，并表现出粘弹性行为：线性加载，塑性变形和片失效。聚四氟乙烯在制造过程中的纤颤程度影响最终板材的性能，压延引起纤维取向、晶体织构和宏观力学各向异性。将PTFE分数增加3.5 wt %，可显著提高极限抗拉强度（+900%）和失效应变（+30%）。当电极温度升高（19℃）时，随着PTFE由三斜相转变为六方相，延迟了板材的失效，然而，当温度升高（80℃）时，纤维伸长、拉出和广泛的纤维断裂加速了板材的失效。

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来源期刊

ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

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.