Effects of contaminant water on coulombic efficiency of lithium deposition/dissolution reactions in tetraglyme-based electrolytes
Effects of contaminant water on coulombic efficiency of lithium deposition/dissolution reactions in tetraglyme-based electrolytes
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DOI：
10.1016/j.jpowsour.2017.03.041
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发表时间：
2017-05-15
影响因子：
9.2
通讯作者：
Nakanishi, Shuji
中科院分区：
文献类型：
--
作者：
Koshikawa, Hiroyuki;Matsuda, Shoichi;Nakanishi, Shuji
研究了四甘醇二甲醚电解液中水浓度（C-H2O）对锂（Li）沉积/溶解反应库仑效率（CE）的影响。随着C-H2O增加到1000 ppm，CE从大约50%增加到80%，但是随着C-H2O的进一步增加而降低。所形成的Li沉积物的X射线光电子能谱分析揭示，在C-H2O值为1000 ppm时CE的增加与电阻性氢氧化锂（110 H）的形成有关。此外，沉积物的扫描电子显微镜分析显示，当C-H2O超过1000 ppm时，形成具有数十μ m尺寸的大的Li聚集体。总之，这些结果表明，优化的水量有利于可逆的Li沉积/溶解反应。(C)2017爱思唯尔B. V.保留所有权利。
The effects of water concentration (C-H2O) on the coulombic efficiency (CE) of lithium (Li) deposition/ dissolution reactions in tetraglyme-based electrolytes are examined. The CE increases from approximately 50% to 80% with increasing C-H2O to 1000 ppm, but decreases with further increase in C-H2O. X-ray photoelectron spectroscopy analyses of the formed Li deposits reveal that the increase in CE at C-H2O values of 1000 ppm is associated with the formation of resistive lithium hydroxide (110H). In addition, scanning electron microscopic analysis of the deposits reveals that large Li-aggregates with the size of several tens of pm are formed when the C-H2O exceeds 1000 ppm. Taken together, these results indicate that optimized amount of water is beneficial for reversible Li deposition/dissolution reactions. (C) 2017 Elsevier B.V. All rights reserved.