An Effectively Activated Hierarchical Nano-/Microspherical Li1.2Ni0.2Mn0.6O2 Cathode for Long-Life and High-Rate Lithium-Ion Batteries

被引：67
作者：
Li, Yu [1 ]
Bai, Ying [1 ,2 ]
Bi, Xuanxuan [3 ]
Qian, Ji [1 ]
Ma, Lu [4 ]
Tian, Jun [1 ]
Wu, Chuan [1 ,2 ]
Wu, Feng [1 ,2 ]
Lu, Jun [3 ]
Amine, Khalil [3 ]
机构：
[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China
[2] Collaborat Innovat Ctr Elect Vehicles Beijing, Beijing 100081, Peoples R China
[3] Chem Sci & Engn Div, 9700 South Cass Ave, Lemont, IL 60439 USA
[4] Xray Sci Div, 9700 South Cass Ave, Lemont, IL 60439 USA
来源：
CHEMSUSCHEM | 2016年 / 9卷 / 07期
关键词：
electrochemistry; energy storage; hierarchical structures; lithium; lithium-ion batteries; HIGH-CAPACITY; RICH CATHODE; ELECTROCHEMICAL PERFORMANCE; NANOSTRUCTURED MATERIALS; ENERGY-CONVERSION; BUILDING-BLOCKS; STORAGE DEVICES; VOLTAGE FADE; ELECTRODES; COMPOSITE;
D O I：
10.1002/cssc.201501548
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Rechargeable lithium-ion batteries with high energy and high power density are required in the application of electric vehicles and portable electronics. Herein, we introduce a type of spherical Li-rich cathode material, Li1.2Ni0.2Mn0.6O2, assembled from uniform nanocubes by a facile polyvinylpyrrolidone (PVP)-assisted hydrothermal method. The material with a hierarchical nano-/microstructure exhibits stable high-rate performance. Furthermore, the precipitant (i.e., urea) and the structure-directing agent (i.e., PVP) effectively activated the Li2MnO3 components in the microscale material to achieve a high specific capacity of 298.5mAhg(-1) in the first cycle. This Li-rich cathode material still delivered 243mAhg(-1) at 0.1C after 200cycles and the capacity retentions at 0.5, 1, 2, and 5C were 94.4, 78.7, 76.3, and 67.8% after 150cycles, respectively. The results make this Li-rich nano-/microstructure a promising cathode material for long-life and high-performance lithium-ion batteries.
引用
收藏
页码：728 / 735
页数：8
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