材料科学
阳极
电解质
锂(药物)
化学工程
复合数
法拉第效率
锂离子电池
电化学
相间
复合材料
电极
离子电导率
快离子导体
作者
Guo Junpo,Wei Wu,Jun Wang,Tian Zhang,Ruo Wang,Dongwei Xu,Chaoyang Wang,Yonghong Deng
标识
DOI:10.1016/j.ssi.2020.115272
摘要
Abstract High-performance electrode materials with intelligent design hold the promise for the development of lithium ion batteries regarding high energy density and long cycling life. Herein, we report an artificial solid electrolyte interphase (SEI) modified porous SiOx anode (P-SiOx) prepared by a facile in-situ polymerization of tannin (PTN) under alkaline condition, forming an elastic polymer layer surrounding P-SiOx particles. The as-prepared P-SiOx@PTN composite demonstrates higher initial Coulombic efficiency (ICE) and stronger mechanical property than the P-SiOx. Consequently, the outer elastic and electric buffer layer ensures the composite showing a high reversible capacity of 1616 mAh g−1 at 0.1 C and exceptional long-term cycling performance. Moreover, when coupled with LiNi0.8Mn0.1Co0.1O2 cathode, high reversible capacity (123 mAh g−1) and good capacity retention (83 mAh g−1 after 300 cycles) at 0.5 C are achieved. This facile method constructing the artificial solid electrolyte interphase with enhanced mechanical and electrochemical properties by the in-situ PTN is of great promise for Si-based anode materials.
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