电解质
材料科学
碳酸二甲酯
碳酸乙烯酯
电化学
锂(药物)
阳极
电镀(地质)
碳酸锂
化学工程
碳酸盐
碳酸丙烯酯
多收费
储能
无机化学
电极
化学
冶金
电池(电)
有机化学
离子
离子键合
催化作用
功率(物理)
物理化学
内分泌学
工程类
地质学
物理
医学
量子力学
地球物理学
作者
Simeng Zhang,Gaojing Yang,Shuai Liu,Xiaoyun Li,Xuefeng Wang,Zhaoxiang Wang,Liquan Chen
出处
期刊:Nano Energy
[Elsevier]
日期:2020-04-01
卷期号:70: 104486-104486
被引量:51
标识
DOI:10.1016/j.nanoen.2020.104486
摘要
Lithium metal is an ideal anode material for high energy-density batteries owing to its high specific capacity and low redox potential. The carbonate-based electrolytes are attractive in developing high energy-density lithium metal batteries because of their wide electrochemical windows. However, the lithium deposition potential is often found dropping in the cells using the carbonate-based electrolytes, which may lead to overcharge as well as low energy conversion efficiency and low energy density of a full cell. Herein, the reason for the potential dropping in the commercial LiPF6-EC/DMC electrolyte is studied by both electrochemical evaluation and physical characterization (EC for ethylene carbonate and DMC for dimethyl carbonate). It is clarified that the repeated formation and decomposition of the organic species such as ROCO2Li and ROLi in the solid electrolyte interphase (SEI) layer during lithium plating/stripping cycling are responsible for the potential dropping. Our findings shed light on eliminating or suppressing the potential dropping to improve the energy density and the energy conversion efficiency of the secondary lithium metal batteries.
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