Improved Performance of High Voltage Graphite/LiNi0.5Mn1.5O4 Batteries with Added Lithium Tetramethyl Borate

ECS Electrochemistry Letters Pub Date : 2015-01-01 DOI:10.1149/2.0021508EEL

Mengqing Xu, Liu Zhou, Yingnan Dong, U. K. Tottempudi, Julien Demeaux, A. Garsuch, B. Lucht

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引用次数: 17

Abstract

Lithium tetramethyl borate (LTMB, LiB(OCH3)4) has been prepared and investigated as a novel cathode film forming additive to improve the performance of LiNi0.5Mn1.5O4 cathodes cycled to high potential (4.25-4.8 V). Addition of LTMB to 1.2 M LiPF6 in EC/EMC (3/7, v/v) improves the capacity retention of graphite/LiNi0.5Mn1.5O4 cells cycled at 55◦C. The added LTMB is sacrificially oxidized on the surface of the cathode during the first charging cycle. Ex-situ surface analysis of the LiNi0.5Mn1.5O4 by X-ray photoelectron spectroscopy (XPS) reveals the presence of a borate based passivating layer which appears to inhibit electrolyte oxidation on the cathode surface. © The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. [DOI: 10.1149/2.0021508eel] All rights reserved.

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添加四甲基硼酸锂改善高压石墨/LiNi0.5Mn1.5O4电池性能

制备并研究了四甲基硼酸锂(LTMB, LiB(OCH3)4)作为一种新型阴极成膜添加剂，以改善循环至高电位(4.25-4.8 V)的LiNi0.5Mn1.5O4阴极的性能。在EC/EMC (3/7, V / V)条件下，将LTMB添加到1.2 M LiPF6中，可以提高55◦C循环时石墨/LiNi0.5Mn1.5O4电池的容量保持率。在第一次充电循环中，所添加的LTMB在阴极表面被牺牲氧化。利用x射线光电子能谱(XPS)对LiNi0.5Mn1.5O4进行了非原位表面分析，发现阴极表面存在硼酸盐基钝化层，该钝化层可以抑制电解液的氧化。©作者2015。由ECS出版。这是一篇在知识共享署名非商业禁止衍生品4.0许可(CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/)条款下发布的开放获取文章，该许可允许在任何媒介上进行非商业重用、分发和复制，前提是原始作品不以任何方式改变并适当引用。如需商业使用许可，请发邮件至oa@electrochem.org。[DOI: 10.1149/2.0021508eel]版权所有

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ECS Electrochemistry Letters ELECTROCHEMISTRY-MATERIALS SCIENCE, MULTIDISCIPLINARY

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