High power nano-LiMn2O4 cathode materials with high-rate pulse discharge capability for lithium-ion batteries

doi:10.1088/1674-1056/20/2/028201

中国物理B ›› 2011, Vol. 20 ›› Issue (2): 28201-028201.doi: 10.1088/1674-1056/20/2/028201

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

High power nano-LiMn₂O₄ cathode materials with high-rate pulse discharge capability for lithium-ion batteries

陈颖超, 谢凯, 盘毅, 郑春满, 王华林

Department of Material Engineering and Applied Chemistry, College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China

收稿日期:2010-03-03 修回日期:2010-11-24 出版日期:2011-02-15 发布日期:2011-02-15
基金资助:
Project supported by the National Natural Science Foundation for Postdoctoral Scientists of China (Grant No. 20090451554).

High power nano-LiMn₂O₄ cathode materials with high-rate pulse discharge capability for lithium-ion batteries

Chen Ying-Chao(陈颖超)^†,Xie Kai(谢凯),Pan Yi(盘毅), Zheng Chun-Man(郑春满),and Wang Hua-Lin(王华林)

Department of Material Engineering and Applied Chemistry, College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China

Received:2010-03-03 Revised:2010-11-24 Online:2011-02-15 Published:2011-02-15
Supported by:
Project supported by the National Natural Science Foundation for Postdoctoral Scientists of China (Grant No. 20090451554).

摘要/Abstract

摘要： Nano-LiMn₂O₄ cathode materials with nano-sized particles are synthesized via a citric acid assisted sol--gel route. The structure, the morphology and the electrochemical properties of the nano-LiMn₂O₄ are investigated. Compared with the micro-sized LiMn₂O₄, the nano-LiMn₂O₄ possesses a high initial capacity (120 mAh/g) at a discharge rate of 0.2 C (29.6 mA/g). The nano-LiMn₂O₄ also has a good high-rate discharge capability, retaining 91% of its capacity at a discharge rate of 10 C and 73% at a discharge rate of 40 C. In particular, the nano-LiMn₂O₄ shows an excellent high-rate pulse discharge capability. The cut-off voltage at the end of 50-ms pulse discharge with a discharge rate of 80 C is above 3.40 V, and the voltage returns to over 4.10 V after the pulse discharge. These results show that the prepared nano-LiMn₂O₄ could be a potential cathode material for the power sources with the capability to deliver very high-rate pulse currents.

Abstract: Nano-LiMn₂O₄ cathode materials with nano-sized particles are synthesized via a citric acid assisted sol–gel route. The structure, the morphology and the electrochemical properties of the nano-LiMn₂O₄ are investigated. Compared with the micro-sized LiMn₂O₄, the nano-LiMn₂O₄ possesses a high initial capacity (120 mAh/g) at a discharge rate of 0.2 C (29.6 mA/g). The nano-LiMn₂O₄ also has a good high-rate discharge capability, retaining 91% of its capacity at a discharge rate of 10 C and 73% at a discharge rate of 40 C. In particular, the nano-LiMn₂O₄ shows an excellent high-rate pulse discharge capability. The cut-off voltage at the end of 50-ms pulse discharge with a discharge rate of 80 C is above 3.40 V, and the voltage returns to over 4.10 V after the pulse discharge. These results show that the prepared nano-LiMn₂O₄ could be a potential cathode material for the power sources with the capability to deliver very high-rate pulse currents.

Key words: lithium-ion batteries, lithium manganese oxide, high-rate, pulse discharge

中图分类号: (Lithium-ion batteries)

82.47.Aa

82.45.Yz (Nanostructured materials in electrochemistry)

陈颖超, 谢凯, 盘毅, 郑春满, 王华林. High power nano-LiMn₂O₄ cathode materials with high-rate pulse discharge capability for lithium-ion batteries[J]. 中国物理B, 2011, 20(2): 28201-028201.

Chen Ying-Chao(陈颖超),Xie Kai(谢凯),Pan Yi(盘毅), Zheng Chun-Man(郑春满),and Wang Hua-Lin(王华林) . High power nano-LiMn₂O₄ cathode materials with high-rate pulse discharge capability for lithium-ion batteries[J]. Chin. Phys. B, 2011, 20(2): 28201-028201.

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High power nano-LiMn₂O₄ cathode materials with high-rate pulse discharge capability for lithium-ion batteries

High power nano-LiMn₂O₄ cathode materials with high-rate pulse discharge capability for lithium-ion batteries

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