电解质
锂(药物)
石墨
电化学
法拉第效率
双键
磺酸盐
材料科学
无机化学
化学
阳极
化学工程
高分子化学
钠
有机化学
电极
物理化学
内分泌学
工程类
医学
作者
Shuai Heng,Linze Lv,Yunhao Zhu,Jie Shao,Weibo Huang,Fu Long,Qunting Qu,Honghe Zheng
出处
期刊:Carbon
[Elsevier BV]
日期:2021-07-07
卷期号:183: 108-118
被引量:14
标识
DOI:10.1016/j.carbon.2021.06.069
摘要
The electrochemical performance of lithium ion batteries is closely related to the solid electrolyte interphase (SEI) film formed on anode surface. Despite the widespread commercialization of graphite anodes, SEI still suffers from unsatisfactory stability, leading to gradual loss of active lithium ions and capacity degradation of batteries. Here organic small molecular salts with unsaturated bonds and diverse anions are coated on graphite particles and work as substrates to form a modified SEI. The CC double bond-containing organic salts, sodium acrylate (SA), sodium vinylsulfonate (SVS) and vinyl sodium phosphate (VSP), possessing carboxylate, sulfonate and phosphate groups, respectively, are rationally selected and their effects on the SEI and electrochemical properties of graphite anodes are systematically investigated. SVS modified graphite generates a SEI film with high flexibility, good compactness and lithium ions conductivity owning to the in-situ polymerization of carbon double bonds and polarity of ionic sulfonate groups. Accordingly, the first coulombic efficiency, rate capability and cycle life of graphite anodes are improved in both half cell and LiNi0·6Co0·2Mn0·2O2-based full cell testing.
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