材料科学
氧化物
过渡金属
阴极
离子
超级交换
氧气
化学物理
原子单位
金属
表面改性
曲面重建
镍
电化学
化学工程
锂(药物)
电极
纳米技术
曲面(拓扑)
物理化学
冶金
化学
几何学
生物化学
量子力学
物理
有机化学
催化作用
医学
数学
内分泌学
工程类
作者
Xinyan Li,Ang Gao,Zhexin Tang,Fanqi Meng,Tongtong Shang,Shengnan Guo,Jiarun Ding,Yanhong Luo,Dongdong Xiao,Xuefeng Wang,Dong Su,Qinghua Zhang,Lin Gu
标识
DOI:10.1002/adfm.202010291
摘要
Abstract Loss of active materials is a critical problem of layered oxide cathodes for lithium‐ion batteries and undermines their long‐term electrochemical performance. However, the atomic‐scale outward migration mechanism of transition metals and oxygen remains elusive due to a highly localized environment at surface. Here, the robust surface reconstruction of LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC811) induced by artificially introduced Ni/Li antisites is reported. Using scanning transmission electron microscopy, the outward co‐migration process of nickel and oxygen ions is directly revealed at the atomic scale, finally resulting in a stable surface structure. The robust nature of this surface structure originates from the strong linear superexchange interaction between subsurface Ni Li and surface Ni as supported by first‐principles calculations. An idealized subsurface structure with Ni Li is designed to suppress the outward migration of transition metal and oxygen ions and provide a universal lattice‐coherent surface protection strategy for layered lithium transition metal oxide cathodes.
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