材料科学
电化学
钠
傅里叶变换红外光谱
电池(电)
大气(单位)
反应性(心理学)
化学工程
钠离子电池
分析化学(期刊)
无机化学
离子
电极
环境化学
冶金
化学
有机化学
功率(物理)
物理化学
病理
法拉第效率
热力学
替代医学
医学
量子力学
工程类
物理
作者
Lituo Zheng,Lingjun Li,Ramesh Shunmugasundaram,M. N. Obrovac
标识
DOI:10.1021/acsami.8b14209
摘要
NaNi0.5Mn0.5O2 is a promising sodium-ion battery cathode material that has been extensively studied. However, the air sensitivity of this material limits practical application and is not well understood. Here, we present a detailed study of NaNi0.5Mn0.5O2 powders stored in different atmospheres (oxygen, argon, and carbon dioxide), either dry or wet. X-ray diffraction and Fourier transform infrared measurements were used to characterize the materials and their surface species before and after controlled-atmosphere storage. It was determined that the exposure of untreated NaNi0.5Mn0.5O2 powders to moisture results in desodiation and material degradation, leading to poor cycling. This effect was found to be caused by reactive surface species. From these results, a simple ethanol washing method was found to significantly reduce the air-reactivity and improve the electrochemical performance of NaNi0.5Mn0.5O2 by removing surface impurities formed by air exposure.
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