Ji Xueqian, Xu Yuxing, Xia Qing, Zhou Yuncheng, Song Jiechen, Feng Hailan, Wang Pengfei, Yang Jun, Tan Qiangqiang
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
ACS Appl Mater Interfaces. 2022 Jul 6;14(26):30133-30143. doi: 10.1021/acsami.2c03073. Epub 2022 Jun 23.
With the increasing demand for high energy density and rapid charging performance, Li-rich materials have been the up and coming cathodes for next-generation lithium-ion batteries. However, because of oxygen evolution and structural instability, the commercialization of Li-rich materials is extremely retarded by their poor electrochemical performances. In this work, Li-deficient materials LiNbO and (NbLi)TiO are applied to functionalize the surface of LiMnNiCoO, aiming to suppress oxygen evolution and increase structural stability in LIBs. In addition, a fast Li-ion transport channel is beneficial to enhance Li diffusion kinetics. The results demonstrate that the electrodes decorated with LiNbO and (NbLi)TiO materials exhibit more stable cycling stability after long-term cycling and outstanding rate capability.
随着对高能量密度和快速充电性能需求的不断增加，富锂材料已成为下一代锂离子电池中崭露头角的阴极材料。然而，由于析氧和结构不稳定性，富锂材料的商业化因其较差的电化学性能而受到极大阻碍。在这项工作中，缺锂材料LiNbO和(NbLi)TiO被用于对LiMnNiCoO的表面进行功能化处理，旨在抑制析氧并提高锂离子电池中的结构稳定性。此外，快速的锂离子传输通道有利于增强锂扩散动力学。结果表明，用LiNbO和(NbLi)TiO材料修饰的电极在长期循环后表现出更稳定的循环稳定性和出色的倍率性能。
