材料科学
阴极
结晶度
锂(药物)
双功能
涂层
化学工程
电化学
插层(化学)
离子电导率
电极
离子键合
电解质
复合材料
热稳定性
离子
无机化学
物理化学
物理
工程类
内分泌学
医学
催化作用
化学
量子力学
生物化学
作者
Jong Hwa Kim,Hyeongwoo Kim,Wonchang Choi,Min Park
标识
DOI:10.1021/acsami.0c10799
摘要
High-Ni cathode materials with a layered structure generally suffer from structural instability induced by a highly reactive Ni component, especially at the surface. Crystalline LiNbO3, with excellent thermal stability and ionic conductivity, has the potential to considerably enhance the interfacial stability of these cathode materials. By optimizing the crystalline coating of bifunctional LiNbO3 on a high-Ni cathode material, we are able to improve cycle performance and rate capability by minimizing the direct exposure of Ni with electrolytes. Since a LiNbO3 coating layer directly affects electrochemical performance, we also focus on the correlation of LiNbO3 crystallinity with electrochemical behaviors of Li+ in the cathode materials. We show that the Li+ conducting behaviors are closely related to the crystallinity of LiNbO3. Highly crystalline LiNbO3 effectively suppresses the structural changes of the cathode materials by facilitating strain relaxation induced by repeated Li+ intercalation and deintercalation into and from the host structure. Moreover, it offers strong enhancement in mechanical and thermal stabilities at elevated temperatures above 60 °C. In this regard, this research provides a practical solution for successfully utilizing high-Ni layered cathode materials in commercial LIBs.
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