Li/LiFePO4 batteries with room temperature ionic liquid as electrolyte

被引：82

作者：

Jin, J. ^{[1
]}

Li, H. H. ^{[1
]}

Wei, J. P. ^{[1
]}

Bian, X. K. ^{[1
]}

Zhou, Z. ^{[1
]}

Yan, J. ^{[1
]}

机构：

[1] Nankai Univ, Inst New Energy Mat Chem, Dept Chem Mat, Tianjin 300071, Peoples R China

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2009年 / 11卷 / 07期

关键词：

Room temperature ionic liquid; Lithium batteries; Safety; LiFePO4; Vinylene carbonate; Piperidinium; LI/LICOO2; CELL;

D O I：

10.1016/j.elecom.2009.05.040

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Room temperature ionic liquid (RTIL) was prepared on basis of N-methyl-N-butylpiperidinium bis(trifluoromethanesulfonyl)imide (PP14TFSI), which showed a wide electrochemical window (-0.1-5.2 V vs. Li+/Li) and is theoretically feasible as an electrolyte for batteries with metallic Li as anodes. The addition of vinylene carbonate (VC) improved the compatibility Of PP14TFSI-based electrolyte towards lithium anodes and enhanced the formation of solid electrolyte interphase film to protect lithium anodes from corrosion. Accordingly, Li/LiFePO4 cells initially delivered a discharge capacity of about 127 mAh g(-1) at a current density of 17 mA g(-1) in the ionic liquid with the addition of VC and showed better cyclability than in the near ionic liquid. Electrochemical impedance spectroscopy disclosed that the addition of VC enhanced Li-ion diffusion and depressed interfacial resistance significantly. (c) 2009 Elsevier B.V. All rights reserved.

引用

页码：1500 / 1503

页数：4