材料科学
阳极
离子电导率
硅
锂(药物)
化学工程
离子键合
电导率
复合材料
离子
电极
冶金
有机化学
化学
物理化学
医学
工程类
电解质
内分泌学
作者
Yang He,Feng Zhou,Yingxi Zhang,Tuan Lv,Paul K. Chu,Kaifu Huo
出处
期刊:Small
[Wiley]
日期:2024-07-19
标识
DOI:10.1002/smll.202404556
摘要
Abstract Silicon (Si) is a promising anode material for high‐energy‐density lithium‐ion batteries, but the significant volume change of Si particles during alloying/dealloying with lithium (Li) undermines the mechanical integrity of Si anode, causing electrode fracture, delamination and rapid capacity decay. Herein, a robust triple crosslinked network (TCN) binder with high ionic conductivity and hierarchical stress dissipation is reported for Si anodes, which is prepared by in situ chemical crosslinking polyacrylic acid (PAA) and melamine (MA). The triple interactions of hydrogen bonds, electrostatic interactions, and covalent amide bonds enhance the adhesion of binder to Si and synergistically promote stress dissipation within Si anodes, thus strengthening the dynamic structural stability of Si anodes during cycling. Moreover, the rapid coupling/decoupling of Li + with the TCN binder enables an impressive Li + transference number of 0.63 and high ionic conductivity of 1.2 × 10 −4 S cm −1 . Consequently, the Si‐TCN anode delivers specific capacity of 2268 mAh g −1 with a high mass loading of 2 mg cm −2 , high‐rate performance of 1673 mAh g −1 at 5 A g −1 , and stable cycling for 250 cycles at 1 A g −1 , thus showing great prospects for high‐energy‐density Si‐based batteries.
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