Structurally modulated Li-rich cathode materials through cooperative cation doping and anion hybridization  

作　　者：Xu-Dong Zhang Ji-Lei Shi Jia-Yan Liang Ya-Xia Yin Yu-Guo Guo Li-Jun Wan 

机构地区：[1]CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry, Chinese Academy of Sciences [2]School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences

出　　处：《Science China Chemistry》2017年第12期1554-1560,共7页中国科学（化学英文版）

基　　金：supported by the National Key R&D Program of China (2016YFA0202500);the National Natural Science Foundation of China (51225204, 21127901);the "Strategic Priority Research Program" of the Chinese Academy of Sciences (XDA09010100)

摘　　要：High capacity Li-rich materials are mighty contenders for building rechargeable batteries that coincide with the demand in energy density. Fully realizing the extraordinary capacity involves oxygen evolution and related cation migration, resulting in phase transitions and deteriorations that would hinder their practical application. In an attempt to enhance the anodic redox participation and stabilize the structure at the same time, we proposed a structural modulation strategy with modification on anion hybridization intensifying and cation doping. Spectator ions with large ionic radius were introduced into the lattice during calcination with stannous chloride and the d-p hybridization between transition metal 3 d and oxygen 2 p orbitals was subsequently intensified along with expelling weakly bonded chloride species in the reheating process. Both of the reversible capacity and stability upon cycling were remarkably improved through the cooperation of bond alteration and dopant. This strategy might provide new insight into the modulation of the structure to truly fulfill the potential of Li-rich materials.High capacity Li-rich materials are mighty contenders for building rechargeable batteries that coincide with the demand in energy density. Fully realizing the extraordinary capacity involves oxygen evolution and related cation migration, resulting in phase transitions and deteriorations that would hinder their practical application. In an attempt to enhance the anodic redox participation and stabilize the structure at the same time, we proposed a structural modulation strategy with modification on anion hybridization intensifying and cation doping. Spectator ions with large ionic radius were introduced into the lattice during calcination with stannous chloride and the d-p hybridization between transition metal 3d and oxygen 2p orbitals was subsequently intensified along with expelling weakly bonded chloride species in the reheating process. Both of the reversible capacity and stability upon cycling were remarkably improved through the cooperation of bond alteration and dopant. This strategy might provide new insight into the modulation of the structure to truly fulfill the potential of Li-rich materials.

关 键 词：Li-ion batteries cathode materials structural modification doping anodic redox 

分 类 号：TB33[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]