材料科学
阳极
电解质
聚丙烯酸
电极
硅
电化学
纳米技术
锂(药物)
化学工程
石墨
复合材料
光电子学
聚合物
化学
医学
物理化学
工程类
内分泌学
作者
Meifang Jiang,Pengzhou Mu,Huanrui Zhang,Ting Dong,Ben Zhong Tang,Huayu Qiu,Chen Zhou,Guanglei Cui
标识
DOI:10.1007/s40820-022-00833-5
摘要
Silicon (Si) has been regarded as an alternative anode material to traditional graphite owing to its higher theoretical capacity (4200 vs. 372 mAh g-1). However, Si anodes suffer from the inherent volume expansion and unstable solid electrolyte interphase, thus experiencing fast capacity decay, which hinders their commercial application. To address this, herein, an endotenon sheath-inspired water-soluble double-network binder (DNB) is presented for resolving the bottleneck of Si anodes. The as-developed binder shows excellent adhesion, high mechanical properties, and a considerable self-healing capability mainly benefited by its supramolecular hybrid network. Apart from these advantages, this binder also induces a Li3N/LiF-rich solid electrolyte interface layer, contributing to a superior cycle stability of Si electrodes. As expected, the DNB can achieve mechanically more stable Si electrodes than traditional polyacrylic acid and pectin binders. As a result, DNB delivers superior electrochemical performance of Si/Li half cells and LiNi0.8Co0.1Mn0.1O2/Si full cells, even with a high loading of Si electrode, to traditional polyacrylic acid and pectin binders. The bioinspired binder design provides a promising route to achieve long-life Si anode-assembled lithium batteries.
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