电解质
阳极
石墨
电导率
锂(药物)
材料科学
化学工程
电极
化学
物理化学
复合材料
医学
工程类
内分泌学
作者
Qiurong Chen,Min Chen,Zhangyating Xie,Kuan Zhou,Tianwei Chen,Shen Luo,Shuai Chen,R. Li,Xiaoqing Li,Mengqing Xu,Weishan Li
标识
DOI:10.1021/acs.jpclett.3c02714
摘要
Solid electrolyte interphase (SEI) is regarded as a key factor to enable high power outputs of Lithium-ion batteries (LIBs). Herein, we demonstrate a modified electrolyte consisting of a novel electrolyte additive, 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (FTMS) to construct a highly robust and stable SEI on a graphite anode for LIBs to enhance its rate performance. With 2% FTMS, the anode presents an improved capacity retention from 77.6 to 91.2% at 0.5 C after 100 cycles and an improved capacity from 86 to 229 mAh g-1 at 2 C. Experimental characterizations and theoretical calculations reveal that FTMS is preferentially absorbed and reduced on graphite to construct an interface chemistry with uniform fluoride-containing organic lithium salt and silicon-containing polymer, which exhibits high flexibility and conductivity and endows the SEI with high robustness and stability. This work provides an effective way to address the issue of slow lithium insertion/desertion kinetics of graphite anodes.
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