Complementary dual-doping of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)cathode enhances ion-diffusion and stability for Li-ion batteries  

作　　者：Zhihong Wang Huawei Zhu Haifeng Yu Tao Zhang Yanjie Hu Hao Jiang Chunzhong Li 

机构地区：[1]Shanghai Engineering Research Center of Hierarchical Nanomaterials,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China [2]Key Laboratory for Ultrafine Materials of Ministry of Education,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China [3]State Key Lab of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China

出　　处：《Chinese Chemical Letters》2023年第6期577-582,共6页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21975074,91834301);the Innovation Program of Shanghai Municipal Education Commission;the Fundamental Research Funds for the Central Universities。

摘　　要：The Ni-richLiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)layered cathodes endow Li-ion batteries(LIBs)with high energy density.However,they usually suffer from limited ion-diffusion and structural instability during cycling.Although doping strategy can effectively alleviate these issues,the coupling effects of multi-element doping and the corresponding performance enhancement mechanism have been yet unclear.Here,we report a Zr/Ti dual-doped NCM811 cathode material(ZT-NCM811),in which Zr-ion is doped into both transition metal(TM)layers and lithium layers and Ti-ion is only distributed in TM layers.The dual-doping can effectively enhance crystal structure stability via inhibiting the lattice collapse along c-axis and decreasing the Li/Ni disorder.Meantime,the lattice oxygen escape is also greatly reduced due to the presence of stronger Zr-O and Ti-O bonds,further mitigating the crystal surface parasitic reactions with electrolyte.The resultant ZT-NCM811 exhibits high specific capacity of 124 m Ah/g at even 10 C,much higher than undoped and single-doped NCM811,and a retention of 98.8%at 1 C after 100 cycles.The assembled ZT-NCM811/graphite full cell also delivers superior battery performances and durability.

关 键 词：LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) Dual-doping High power Cycling stability Li-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.11[化学工程—无机化工]