电解质
阴极
电化学
电池(电)
插层(化学)
阳极
涂层
石墨
材料科学
化学工程
锂离子电池
锂(药物)
纳米技术
复合材料
化学
电极
无机化学
工程类
物理
物理化学
内分泌学
功率(物理)
医学
量子力学
作者
Wenhao Li,Hao‐Jie Liang,Xian-Kun Hou,Zhen‐Yi Gu,Xinxin Zhao,Jin‐Zhi Guo,Xu Yang,Xing‐Long Wu
标识
DOI:10.1016/j.jechem.2020.03.043
摘要
Dual-ion battery (DIB) composed of graphite cathode and lithium anode is regarded as an advanced secondary battery because of the low cost, high working voltage and environmental friendliness. However, DIB operated at high potential (usually ≥ 4.5 V versus Li+/Li) is confronted with severe challenges including electrolyte decomposition on cathode interface, and structural deterioration of graphite accompanying with anions de-/intercalation, hinder its cyclic life. To address those drawbacks and preserve the DIB virtues, a feasible and scalable surface modification is achieved for the commercial graphite cathode of mesocarbon microbead. In/ex-situ studies reveal that, such an interfacial engineering facilitates and reconstructs the formation of chemically stable cathode electrolyte interphase with better flexibility alleviating the decomposition of electrolyte, regulating the anions de-/intercalation behavior in graphite with the retainment of structural integrity and without exerting considerable influence on kinetics of anions diffusion. As a result, the modified mesocarbon microbead exhibits a much-extended cycle life with high capacity retention of 82.3% even after 1000 cycles. This study demonstrates that the interface modification of electrode and coating skeleton play important roles on DIB performance improvement, providing the feasible basis for practical application of DIB owing to the green and scalable coating procedures
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