Influence of Post-annealing in N2 on Structure and Electrochemical Characteristics of LiNi0.5Mn1.5O4

doi:10.1007/s40242-013-2190-z

Chemical Research in Chinese Universities ›› 2013, Vol. 29 ›› Issue (2): 329-332.doi: 10.1007/s40242-013-2190-z

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Influence of Post-annealing in N₂ on Structure and Electrochemical Characteristics of LiNi_0.5Mn_1.5O₄

HE Shi-ci¹, ZHANG Qian¹, LIU Wei-wei¹, FANG Guo-qing¹, SATO Yuichi², ZHENG Jun-wei¹, LI De-cheng¹

1. Institute of Chemical Power Sources, Soochow University, Suzhou 215006, P. R. China;
2. Department of Applied Chemistry, Faculty of Engineering, Kanagawa University, Yokohama 221-8686, Japan

Received:2012-05-14 Revised:2012-06-14 Online:2013-04-01 Published:2013-03-20
Supported by:
Supported by the Project of Ministry of Science and Technology of China(No.2010EG111015).

Abstract

Abstract:

LiNi_0.5Mn_1.5O₄ prepared by a spray drying method was re-treated in N₂ at 500, 600 and 700℃, respectively. Their structural and electrochemical properties were studied by means of Fourier transform infrared(FTIR), X-ray diffraction(XRD), and charge-discharge tests. The space group of the LiNi_0.5Mn_1.5O₄ transforms from P4₃32 to Fd3 m at an annealing temperature of 700℃. The electrochemical characteristics of the treated samples are closely related to the annealing temperature. The sample treated in N₂ at 500℃ shows both an improved rate capability and cyclic performance at a high temperature compared with the as-prepared sample, while the sample treated in N₂at 700℃ shows dramatically decrease in its reversible capacity.

Key words: Li-ion battery, Cathode material, LiNi_0.5Mn_1.5O₄, Structural and electrochemical property

HE Shi-ci, ZHANG Qian, LIU Wei-wei, FANG Guo-qing, SATO Yuichi, ZHENG Jun-wei, LI De-cheng. Influence of Post-annealing in N₂ on Structure and Electrochemical Characteristics of LiNi_0.5Mn_1.5O₄[J]. Chemical Research in Chinese Universities, 2013, 29(2): 329-332.

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Influence of Post-annealing in N₂ on Structure and Electrochemical Characteristics of LiNi_0.5Mn_1.5O₄

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