电解质
材料科学
涂层
阴极
锂(药物)
图层(电子)
电池(电)
锂电池
电压
电化学窗口
X射线光电子能谱
电化学
电极
化学工程
复合材料
电气工程
化学
功率(物理)
工程类
离子
离子电导率
物理化学
内分泌学
有机化学
物理
医学
量子力学
离子键合
作者
Cheng Wei,Chuang Yu,Shaoqing Chen,Shuai Chen,Linfeng Peng,Yuanke Wu,Shuping Li,Shijie Cheng,Jia Xie
标识
DOI:10.1016/j.electacta.2022.141545
摘要
The coating layer can effectively mitigate the undesirable side effects that occur at the active material/sulfide electrolyte interface in the cathode mixture. Plenty of research has reported the coating layer effect in the typical voltage window, while the influence at different voltage windows is unclear. Herein, the degradation mechanism of the bare and LiNbO3 coated LiCoO2 electrodes in all-solid-state batteries when cycled at different cut-off voltages has been systematically investigated. Thecoated electrodes exhibit superior electrochemical performance than the bare electrodes at different charging/discharging rates when the upper cut-off voltage is 3.6 V, while both electrodes show fast degradation of battery performance at higher cut-off voltages (3.9 and 4.2 V). The electrochemical performances are highly dependent on the interfacial stability between the active material and solid electrolyte in the cathode mixture and the structural instability of LiCoO2 at different voltage windows. The evolution of interfacial resistances is systematically investigated in combination of in-situ EIS, relaxation time distribution (DRT), TEM, and XPS. Structural changes of bare and coated LiCoO2 before and after cycled at different cut-off voltages are studied by XRD, TEM, and dQ/dV analysis. The clarification of complex interfaces and phase stability evolution of LiCoO2 provides a strong theoretical basis for constructing high-performance all-solid-state batteries.
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