材料科学
电解质
离子键合
碳酸乙烯酯
电化学
电化学窗口
聚合物
离子电导率
无机化学
化学工程
电极
离子
复合材料
有机化学
物理化学
化学
工程类
作者
Zhenxu Lin,Xianwei Guo,Zichun Wang,Boya Wang,Shan He,Luke A. O’Dell,Jun Huang,Hong Li,Haijun Yu,Liquan Chen
出处
期刊:Nano Energy
[Elsevier]
日期:2020-07-01
卷期号:73: 104786-104786
被引量:125
标识
DOI:10.1016/j.nanoen.2020.104786
摘要
Polymer electrolytes are one of promising candidates that can meet the demands of high safety and stability of high-energy lithium metal batteries. However, the practical applications of polymer electrolytes are usually limited by the low ionic conductivity, narrow electrochemical window and highly interfacial resistance. Here we designed a poly(vinyl ethylene carbonate) polymer electrolyte for polymer lithium metal battery by in-situ polymerization method. The new polymer electrolyte provides superior ionic conductivity with 2.1 × 10−3 S cm−1 at 25 °C, wide electrochemical window up to 4.5 V (vs. Li+/Li) and excellent interfacial compatibility to electrodes. The ions transports are mainly achieved from the coupling/decoupling between Li ions and oxygen atoms in CO groups, partially from the coupling/decoupling between Li+ and oxygen atoms in C–O groups, and probably moving/exchange of Li+ between CO and C–O groups in the process of segmental motions in high and low molecular polymers of polymer electrolyte. The lithium metal batteries with LiFePO4 cathode can deliver a high discharge capacity of ~165 mA h g−1 at 25 °C, and even ~104 mA h g−1 at −15 °C with current density of 0.1C. Therefore, the novel polymer electrolyte designed in this study is a promising candidate for high performances polymer lithium metal batteries.
科研通智能强力驱动
Strongly Powered by AbleSci AI