材料科学
硅
电极
阳极
集电器
电化学
锂(药物)
复合材料
微粒
化学工程
锂离子电池
多孔性
电池(电)
电解质
光电子学
化学
功率(物理)
物理化学
内分泌学
工程类
物理
医学
量子力学
作者
Anita Li,Jacob Hempel,Michael P. Balogh,Yang‐Tse Cheng,Alan I Taub
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2023-01-01
卷期号:170 (1): 010533-010533
被引量:4
标识
DOI:10.1149/1945-7111/acb388
摘要
Formulation strongly influences the structure, properties, and electrochemical performance in composite electrodes. The role of polymeric binders is especially critical for electrodes containing high volume change active materials, such as silicon. In this study, we investigated the impact of polyimide binder in silicon microparticle electrodes. The impact of binder content on electrode adhesion to the current collector, cohesion, porosity, electrical resistivity, local electrical connectivity, and silicon utilization was characterized in pristine and cycled electrodes to elucidate the mechanisms driving the electrochemical performance during rate and cycle life tests of Si-NMC622 full cells. We observed that capacity retention improved with increasing binder content, but rate performance suffered with excess binder content, indicating that there is an optimal binder weight fraction to balance the trade-off between these two metrics. Our research reveals important design principles for the optimization of binder content in silicon electrode formulations and can be applied to the development of electrodes containing other active materials and conductive additives.
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