Citation: NIE Xiang, GUO Xiao-Dong, ZHONG Ben-He, LIU Heng, FANG Wei-Mao. Effect of Mn Source on 5 V LiNi_0.5Mn_1.5O₄ Positive Electrode Materials Prepared by Combustion Method[J]. Chinese Journal of Inorganic Chemistry, ;2012, 28(12): 2573-2580. shu

Effect of Mn Source on 5 V LiNi_0.5Mn_1.5O₄ Positive Electrode Materials Prepared by Combustion Method

1.
1. College of Chemical Engineering, Sichuan University, Chengdu 610065, China;

Corresponding author: GUO Xiao-Dong,
Received Date: 22 March 2012
Available Online: 13 June 2012
Fund Project: 国家科技支撑计划(No.2007BAQ01055) (No.2007BAQ01055)国家自然科学基金(No.50574063)以及四川大学青年基金(No.2011SCU11081)资助项目. (No.50574063)以及四川大学青年基金(No.2011SCU11081)

Sub-micrometric LiNi_0.5Mn_1.5O₄ cathode materials were prepared by sucrose combustion method with two different Mn sources. The effect of manganese acetate and manganese nitrate on the crystal structure, morphology, particle size and electrical performance of the prepared samples was evaluated by X-ray diffraction (XRD),scanning electron microscopy (SEM), particle size analysis, cyclic voltammetry (CV),galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). XRD analysis shows that the structure of both samples is a typical cubic spinel with Fd3m space group. The particle size and the distribution of the LiNi_0.5Mn_1.5O₄ powder are strongly influenced by Mn source. The materials prepared by manganese acetate have smaller particle size and narrower particle size distribution, which can facilitate Li ions extraction and insertion. Furthermore, the sample LiNi_0.5Mn_1.5O₄ prepared by manganese acetate has better electrochemical performances. An initial specific capacity of 144.5 mAh·g^-1 at 1C in the voltage range of 3.6~5.2 V, 96% of the initial capacity after 100 cycles is maintained, and capacities of 136.3, 132.0, 124.7 and 96.6 mAh·g^-1 are achieved at the rate of 3C, 5C, 10C and 20C, respectively.
- high voltage cathode materials;sucrose combustion method;LiNi_0.5Mn_1.5O₄;Mn source
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沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Mn Source on 5 V LiNi0.5Mn1.5O4 Positive Electrode Materials Prepared by Combustion Method

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通讯作者: 陈斌, bchen63@163.com

Effect of Mn Source on 5 V LiNi_0.5Mn_1.5O₄ Positive Electrode Materials Prepared by Combustion Method