Hollow spherical LiNi0.5Mn1.5O4 built from polyhedra with high-rate performance via carbon nanotube modification
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- 作者：Luoluo Wang 王洛沿/a> ; Zhengyao Hu 胡正耀 ; Kangning Zhao 赵康嬿/a>…
- 关键词：lithium nickel manganese oxide spinel ; hollow sphere ; carbon nanotube modifi cation ; high ; rate performance ; lithiumion batteries
- 刊名：Science China Materials
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：59
- 期：2
- 页码：95-103
- 全文大小：1,078 KB
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Zhengyao Hu 胡正耀 (1)
Kangning Zhao 赵康宁 (1)
Yanzhu Luo 罗艳珠 (1)
Qiulong Wei 魏湫龙 (1)
Chunjuan Tang 唐春娟 (1)
Ping Hu 胡平 (1)
Wenhao Ren 任文皓 (1)
Liqiang Mai 麦立强 (1)
1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China - 刊物类别：Materials Science, general; Chemistry/Food Science, general;
- 刊物主题：Materials Science, general; Chemistry/Food Science, general;
- 出版者：Science China Press
- ISSN：2199-4501
文摘
Lithium nickel manganese oxide spinel (LiNi0.5Mn1.5O4, LNMO) has attracted much attention as the cathode material for rechargeable lithium-ion batteries due to its high energy density and low cost. However, the short cycle life and poor high-rate capability hinder its commercialization. In this study, we synthesized hollow spherical LNMO built from polyhedral particles. The LNMO hollow structure guarantees sufficient contact with electrolyte and rapid diffusion of lithium ions. To enhance the conductivity, we use carbon nanotubes (CNTs) to modify the surface of the cathode. After CNT modification, the LNMO hollow structure manifests outstanding cycling stability and high-rate capability. It delivers a discharge capacity of 127 mA h g−1 at 5 C, maintaining 104 mA h g−1 after 500 cycles. Even at a high rate of 20 C, a capacity of 121 mA h g−1 can be obtained. The excellent electrochemical performance is ascribed to the unique structure and the enhanced conductivity through CNT modification. It is demonstrated that the CNT-modified hollow spherical LNMO is a promising cathode for lithium ion batteries.