石墨
复合数
材料科学
碳纳米管
电极
小袋
复合材料
碳纤维
离子
纳米管
纳米技术
化学工程
化学
有机化学
物理化学
工程类
解剖
医学
作者
Reid Dressler,J. R. Dahn
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2024-03-13
标识
DOI:10.1149/1945-7111/ad3398
摘要
Abstract Silicon-Graphite composite electrodes are a rapidly developing area of research and commercialization. Increasing the energy density of current Li-ion battery technology can be done by simply creating silicon/graphite composite electrodes. It is well known that the failure of these silicon/graphite composite electrodes stems from the expansion of the silicon during cycling that causes mechanical degradation, excessive SEI formation, and electrode shift loss. Development of a suitable binder will be crucial to the success of these composites. In this work we explore the benefits of CMC/SBR binder used in conjunction with single walled carbon nanotubes. These nanotubes are thought to be effective in increasing mechanical strength of the electrodes and increase the electrical connectivity between particles within the formed electrode. When the Si/graphite electrode cycles, it is believed that the SWCNTs help keep the active particles electrically connected and, hence, electrochemically active. The pouch cells studied here are shown to exhibit minimal loss of active mass in the negative electrode but experience capacity loss due to continued negative electrode SEI growth leading to lithium inventory or shift loss.
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