Electrochemical Performance and Thermal Stability Studies of Two Lithium Sulfonyl Methide Salts in Lithium-Ion Battery Electrolytes
Electrochemical Performance and Thermal Stability Studies of Two Lithium Sulfonyl Methide Salts in Lithium-Ion Battery Electrolytes
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DOI：
10.1149/2.0261509jes
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发表时间：
2015-01-01
影响因子：
3.9
通讯作者：
Winter, Martin
中科院分区：
文献类型：
--
作者：
Murmann, Patrick;Schmitz, Raphael;Winter, Martin
含磺酰甲基锂盐的电解质溶液（三氟甲磺酰基）甲基化物（LiTFSM）和锂-[双（三氟甲磺酰基）甲基]在Li/石墨、Li/LiNi 1/3Co 1/3 Mn 1/3 O 2（NCM）半电池中研究了溶解在有机碳酸酯溶剂中的（三氟甲基磺酰基）-五氟乙基磺酰基]甲基化物（LiPFSM）的电化学性质，虽然所研究的盐在Li/石墨半电池中与含LiPF 6的电解质相比显示出几乎相同的性能，但甲基化物盐在Li/NCM半电池中显示出非常有希望的结果，其与含LiPF 6的电解质相比表现出上级容量保持率以及更高的库仑效率。考虑到有限的阳极稳定性以及发生的阳极溶解，两种盐，但特别是LiTFSM表明在锂离子电池电解质中的适用性，用于截止电位高达4.3 V（相对于Li/Li+）的电池。(C)作者（S）2015由ECS发布。All rights reserved.
Electrolyte solutions, containing the lithium sulfonyl methide salts lithium-tris(trifluoromethanesulfonyl)methide (LiTFSM) and lithium-[bis(trifluoromethylsulfonyl)-pentafluoroethylsulfonyl]methide (LiPFSM) dissolved in organic carbonate solvents, were electrochemically investigated in Li/graphite, Li/LiNi1/3Co1/3Mn1/3O2 (NCM) half-cells and compared to the LiPF6 based electrolyte with regard to their ionic conductivity, electrochemical stability, thermal stability at 60 degrees C and the anodic dissolution behavior vs. Al. While the investigated salts show almost the same performance in Li/graphite half-cells compared to the LiPF6 containing electrolyte, the methide salts show very promising results in Li/NCM half-cells, which depict superior capacity retention as well as higher Coulombic efficiencies compared to the LiPF6 containing electrolyte. Taking the limited anodic stability as well as the occurring anodic dissolution into account, both salts but especially LiTFSM indicate the applicability in lithium ion battery electrolytes for cells with a cutoff potential up to 4.3 V vs. Li/Li+. (C) The Author(s) 2015. Published by ECS. All rights reserved.