氧化还原
X射线光电子能谱
电化学
电解质
材料科学
降级(电信)
离子
碳纤维
离子键合
电极
化学工程
无机化学
化学
物理化学
复合数
计算机科学
工程类
电信
复合材料
有机化学
作者
Laure Caracciolo,Lénaïc Madec,Emmanuel Petit,Vincent Gabaudan,Dany Carlier,Laurence Croguennec,Hervé Martínez
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2020-09-30
卷期号:167 (13): 130527-130527
被引量:15
标识
DOI:10.1149/1945-7111/abbb0c
摘要
K-ion batteries need efficient positive electrode materials with open structural frameworks to accommodate the large ionic radius of K+. In that direction, polyanionic compounds are of great interest. Among them, KVPO4F is the most studied one. Its electrochemical redox processes still remain unclear, especially at high voltage. To tackle this issue, X-ray photoelectron spectroscopy was used to reveal the electrochemical redox processes of KxVPO4F. First, a carbon coating was performed and allowed increasing the overall electrochemical performance while mitigating electrolyte degradation at high voltage. Then, XPS analysis showed a high reversibility of the redox processes although the K+ extraction (and insertion) from x = 0.5 to 0 was hindered, possibly by structural constraints while electrolyte degradation occurred mostly above 4.5 V.
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