材料科学
尖晶石
阴极
电解质
自行车
溶解
电池(电)
高原(数学)
化学计量学
锰
化学工程
分析化学(期刊)
冶金
电极
热力学
物理化学
数学分析
功率(物理)
化学
物理
数学
考古
色谱法
工程类
历史
作者
Valerie Siller,Juan Carlos Gonzalez-Rosillo,Marc Nuñez Eroles,Federico Baiutti,Maciej Oskar Liedke,Maik Butterling,Ahmed G. Attallah,Eric W. Hirschmann,Andreas Wagner,Alex Morata,Albert Tarancón
标识
DOI:10.1021/acsami.2c10798
摘要
Extending the potential window toward the 3 V plateau below the typically used range could boost the effective capacity of LiMn2O4 spinel cathodes. This usually leads to an “overdischarge” of the cathode, which can cause severe material damage due to manganese dissolution into the electrolyte and a critical volume expansion (induced by Jahn–Teller distortions). As those factors determine the stability and cycling lifetime for all-solid-state batteries, the operational window of LiMn2O4 is usually limited to 3.5–4.5 V versus Li/Li+ in common battery cells. However, it has been reported that nano-shaped particles and thin films can potentially mitigate these detrimental effects. We demonstrate here that porous LiMn2O4 thin-film cathodes with a certain level of off-stoichiometry show improved cycling stability for the extended cycling range of 2.0–4.5 V versus Li/Li+. We argue through operando spectroscopic ellipsometry that the origin of this stability lies in the surprisingly small volume change in the layer during lithiation.
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