Citation: TAN Chao-Pu, HU Guo-Rong, DU Ke, LUO Hong-Jun, HUANG Dian-Hua, DUAN Jian-Guo, CAO Yan-Bing. Effect of Synthesis Temperature on the Structural and Electrochemical Properties of a Full Concentration Gradient LiNi_0.7Co_0.15Mn_0.15O₂ Cathode Material[J]. Chinese Journal of Inorganic Chemistry, ;2017, 33(9): 1537-1546. doi: 10.11862/CJIC.2017.203 shu

Effect of Synthesis Temperature on the Structural and Electrochemical Properties of a Full Concentration Gradient LiNi_0.7Co_0.15Mn_0.15O₂ Cathode Material

1.
School of Metallurgy and Environment, Central South University, Changsha 410083, China
2.
Guangzhou Libode New Materials Co., Ltd., Guangzhou 510800, China

Corresponding author: DU Ke, csutcp@163.com
Received Date: 19 June 2017
Revised Date: 26 July 2017

Figures(7)

Spherical Ni_0.7Co_0.15Mn_0.15(OH)₂ precursor with a full concentration gradient (FCG) of Ni, Co and Mn elements was obtained via co-precipitation method. The precursor was evenly mixed with LiOH·H₂O and then sintered at 750~900℃ for 12 h in oxygen to synthesize FCG-LiNi_0.7Co_0.15Mn_0.15O₂ cathode material with the Ni rich in core and Mn rich in the outer layer. The diffusion of Ni, Co, and Mn under different calcination temperatures led to various elements homogeneity, and was analyzed by energy-dispersive X-ray spectroscopy (EDXS). Then, the electrochemical properties of samples were investigated by the charge-discharge test and electrochemical impedance spectroscopy (EIS) test. The results indicate that the cathode material sintered at 800℃ has an obvious concentration-gradient distribution with a shell of LiNi_0.52Co_0.24Mn_0.24O₂ and exhibits the optimal electrochemical performance. Under the voltage range 2.8~4.3 V, it deliveres an initial discharge of 186.1 mAh·g^-1 at a charge-discharge rate of 0.2C, and shows an excellent capacity retention of 90.1% after 200 cycles at a high rate of 2C.
- Lithium-ion battery,
- cathode material,
- full concentration-gradient,
- element diffusion
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Synthesis Temperature on the Structural and Electrochemical Properties of a Full Concentration Gradient LiNi0.7Co0.15Mn0.15O2 Cathode Material

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通讯作者: 陈斌, bchen63@163.com

Effect of Synthesis Temperature on the Structural and Electrochemical Properties of a Full Concentration Gradient LiNi_0.7Co_0.15Mn_0.15O₂ Cathode Material