Complementary dual-doping of LiNi0.8Co0.1Mn0.1O2 cathode enhances ion-diffusion and stability for Li-ion batteries

被引:0
作者
Zhihong Wang [1 ,2 ]
Huawei Zhu [1 ]
Haifeng Yu [1 ]
Tao Zhang [2 ]
Yanjie Hu [1 ,3 ]
Hao Jiang [1 ,3 ]
Chunzhong Li [1 ,3 ]
机构
[1] Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology
[2] State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences
[3] Key Laboratory for Ultrafine Materials of Ministry of Education, School of Chemical Engineering, East China University of Science and Technology
基金
中国国家自然科学基金; 中央高校基本科研业务费专项资金资助;
关键词
D O I
暂无
中图分类号
TM912 [蓄电池]; TQ131.11 [];
学科分类号
0808 ; 0817 ;
摘要
The Ni-richLiNi0.8Co0.1Mn0.1O2(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.
引用
收藏
页码:607 / 612
页数:6
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