Tungsten and phosphate polyanion co-doping of Ni-ultrahigh cathodes greatly enhancing crystal structure and interface stability

作     者：Huawei Zhu Haifeng Yu Zhaofeng Yang Hao Jiang Chunzhong Li Huawei Zhu;Haifeng Yu;Zhaofeng Yang;Hao Jiang;Chunzhong Li

作者机构：Shanghai Engineering Research Center of Hierarchical NanomaterialsFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science&TechnologyShanghai 200237China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2021年第34卷第9期

页      面：144-151页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China(91834301) the Innovation Program of Shanghai Municipal Education Commission the Shanghai Scientific and Technological Innovation Project(18JC1410500) the Fundamental Research Funds for the Central Universities(222201718002) 

主　　题：LiNi_(0.9)Co_(0.1)O_(2) Co-doping Crystal stability Cycling life Li-ion batteries 

摘      要：The Ni-ultrahigh cathode material is one of the best choices for further increasing energy-density of lithium-ion batteries(LIBs),but they generally suffer from the poor structure stability and rapid capacity ***,the tungsten and phosphate polyanion co-doped LiNi_(0.9)Co_(0.1)O_(2)cathode materials are successfully fabricated in terms of Li(Ni_(0.9)Co_(0.7))_(1-x)W_(x)O_(2-4y)(PO_(4))_(y) by the precursor modification and subsequent *** higher bonding energy of W—O(672 kJ·mol^(-1))can extremely stabilize the lattice oxygen of Ni-rich oxides compared with Ni—O(391.6 kJ·mol^(-1))and Co—O(368 kJ·mol^(-1)).Meanwhile,the stronger bonding of Ni—(PO_(4)^(3-))***—O could fix Ni cations in the transition metal layer,and hence suppressing the Li/Ni disorder during the charge/discharge ***,the optimized Li(Ni_(0.9)Co_(0.1))_(0.99)W_(0.01)O_(1.96)(PO_4)_(0.01)delivers a remarkably extended cycling life with 95.1%retention of its initial capacity of 207.4 mA·h·g^(-1)at 0.2 C after 200 ***,the heteroatoms doping does not sacrifice the specific capacity even at different rates.