A wide-temperature superior ionic conductive polymer electrolyte for lithium metal battery

被引：192

作者：

Lin, Zhiyuan ^{[1
]}

Guo, Xianwei ^{[1
]}

Wang, Zichun ^{[2
]}

Wang, Boya ^{[1
]}

He, Shiman ^{[1
]}

O'Dell, Luke A. ^{[3
]}

Huang, Jun ^{[2
]}

Li, Hong ^{[4
]}

Yu, Haijun ^{[1
]}

Chen, Liquan ^{[4
]}

机构：

[1] Beijing Univ Technol, Educ Minist China, Key Lab Adv Funct Mat, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

[2] Univ Sydney, Sch Chem & Biomol Engn, Room 454,Chem Engn Bldg J01, Sydney, NSW 2006, Australia

[3] Deakin Univ, Inst Frontier Mat, Geelong, Vic 3220, Australia

[4] Univ Chinese Acad Sci, Chinese Acad Sci, Sch Phys Sci,Inst Phys, Key Lab Renewable Energy,Beijing Key Lab New Ener, Beijing 100190, Peoples R China

来源：

NANO ENERGY | 2020年 / 73卷 / 73期

基金：

中国国家自然科学基金; 北京市自然科学基金;

关键词：

Poly(vinyl ethylene carboznate) polymer; Polymer electrolyte; Superior ionic conductivity; Li ions transports mechanism; In-situ polymerization; SOLID-ELECTROLYTE; COMPOSITE; PERFORMANCE; ANODE; SUCCINONITRILE; INTERPHASE; MEMBRANE;

D O I：

10.1016/j.nanoen.2020.104786

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

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 x 10(-3) S cm(-1) at 25 degrees 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 C=O groups, partially from the coupling/decoupling between Li+ and oxygen atoms in C-O groups, and probably moving/exchange of Li+ between C=O 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 similar to 165 mA h g(-1) at 25 degrees C, and even similar to 104 mA h g(-1) at -15 degrees 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.

引用

页数：9