Understanding the Origin of Enhanced Performances in Core-Shell and Concentration-Gradient Layered Oxide Cathode Materials

被引:65
作者
Song, Dawei [1 ]
Hou, Peiyu [1 ]
Wang, Xiaoqing [2 ]
Shi, Xixi [1 ]
Zhang, Lianqi [1 ]
机构
[1] Tianjin Univ Technol, Sch Mat Sci & Engn, Tianjin Key Lab Photoelect Mat & Devices, Tianjin 300384, Peoples R China
[2] Tianjin Polytech Univ, Sch Environm & Chem Engn, Tianjin 300387, Peoples R China
关键词
double-shelled precursors; specific structure; surface transition; cathode materials; lithium-ion batteries; HIGH-ENERGY; LINI0.5CO0.2MN0.3O2; CATHODE; THERMAL-STABILITY; LONG-LIFE; ION; MORPHOLOGY; STATE;
D O I
10.1021/acsami.5b02373
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Core shell and concentration-gradient layered oxide cathode materials deliver superior electrochemical properties such as long cycle life and outstanding thermal stability. However, the origin of enhanced performance is not clear and seldom investigated until now. Here, a specific structured layered oxide (LiNi0.5Co0.2Mn0.3O2) consisting of concentration-gradient core, transition layer, and stable outer I shell, is designed and achieved from double-shelled precursors to overcome the great challenge by comparison with the normal layered LiNi0.5Co0.2Mn0.3O2. As expected, the specific structured layered oxide displays excellent cycle life and thermal stability. After numerous cycles, the valence state of Ni and Co at normal layered oxide surface tends to a higher oxidation state than that of the specific structured oxide, and the spinel phase is observed on particle surface of normal layered oxide. Also, the deficient spinel/layered mixed phases lead to high surface film and charge-transfer resistance for normal layered oxide, whereas the specific structured one still remains a layered structure. Those results first illustrate the origin of improved electrochemical performance of layered core shell and concentration-gradient cathode materials for lithium-ion batteries.
引用
收藏
页码:12864 / 12872
页数:9
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