A design strategy of large grain lithium-rich layered oxides for lithium-ion batteries cathode

被引:21
作者
Jiang, Xiong [1 ]
Wang, Zhenhua [1 ,3 ]
Rooney, David [2 ]
Zhang, Xiaoxue [1 ]
Feng, Jie [1 ]
Qiao, Jinshuo [1 ]
Sun, Wang [1 ]
Sun, Kening [1 ,3 ]
机构
[1] Beijing Inst Technol, Sch Chem Engn & Environm, Beijing Key Lab Chem Power Source & Green Catalys, Beijing 100081, Peoples R China
[2] Queens Univ, Sch Chem & Chem Engn, Belfast BT9 5AG, Antrim, North Ireland
[3] Collaborat Innovat Ctr Elect Veh Beijing, Beijing 100081, Peoples R China
基金
中国国家自然科学基金;
关键词
Large grain; Lithium ion battery; Cathode material; Cyclic stability; ELECTRODES; MN; IMPROVEMENT; EVOLUTION; CAPACITY; NI; CO;
D O I
10.1016/j.electacta.2015.02.061
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Li-rich materials are considered the most promising for Li-ion battery cathodes, as high capacity can be achieved. However, poor cycling stability is a critical drawback that leads to poor capacity retention. Here a strategy is used to synthesize a large-grain lithium-rich layered oxides to overcome this difficulty without sacrificing rate capability. This material is designed with micron scale grain with a width of about 300 nm and length of 1-3 mu m. This unique structure has a better ability to overcome stress-induced structural collapse caused by Li-ion insertion/extraction and reduce the dissolution of Mn ions, which enable a reversible and stable capacity. As a result, this cathode material delivered a highest discharge capacity of around 308 mAh g (1) at a current density of 30 mAg (1) with retention of 88.3% (according to the highest discharge capacity) after 100 cycles, 190 mAhg (1) at a current density of 300 mA g (1) and almost no capacity fading after 100 cycles. Therefore, Lithium-rich material of large-grain structure is a promising cathode candidate in Lithium-ion batteries with high capacity and high cycle stability for application. This strategy of large grain may furthermore open the door to synthesize the other complex architectures for various applications. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:131 / 138
页数:8
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