Optimization of EC-based multi-solvent electrolytes for low temperature applications of lithium-ion batteries

被引：77

作者：

Xiao, LF ^{[1
]}

Cao, YL ^{[1
]}

Ai, XP ^{[1
]}

Yang, HX ^{[1
]}

机构：

[1] Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2004年 / 49卷 / 27期

关键词：

ionic conductivity; low temperature; multi-component electrolyte; Li-ion batteries; discharge performance;

D O I：

10.1016/j.electacta.2004.05.038

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The ionic conductivities of EC-based multi-component electrolytes in various solvent compositions were measured over a wide temperature range of +40 to -40 degreesC, and the factors affecting the low temperature conductivities of the electrolytes were discussed. It is revealed from the experimental results that the co-solvents with high dielectric constant and low viscosity can improve the ionic conductivity at room temperature, whereas, only the co-solvents which possess low melting points can effectively expand the operating temperature range of the electrolyte. The Li-ion batteries using the optimized electrolyte of 1 M LiPF6/EC-DMC-EMC (8.3:25:66.7) show the capacity retentions about 90.3% of their nominal capacities when discharged to 2.0 V at -40 degreesC at 0.1 C, demonstrating excellent low temperature performances. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：4857 / 4863

页数：7

共 11 条

[1] Liquid-solid phase diagrams of binary carbonates for lithium batteries [J].