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| Effect of Synthesis Temperature on the Structural and Electrochemical Properties of a Full Concentration Gradient LiNi0.7Co0.15Mn0.15O2 Cathode Material |
| Author Name | Affiliation | E-mail | | TAN Chao-Pu | School of Metallurgy and Environment, Central South University, Changsha 410083, China | | | HU Guo-Rong | School of Metallurgy and Environment, Central South University, Changsha 410083, China | | | DU Ke | School of Metallurgy and Environment, Central South University, Changsha 410083, China | csutcp@163.com | | LUO Hong-Jun | Guangzhou Libode New Materials Co., Ltd., Guangzhou 510800, China | | | HUANG Dian-Hua | Guangzhou Libode New Materials Co., Ltd., Guangzhou 510800, China | | | DUAN Jian-Guo | School of Metallurgy and Environment, Central South University, Changsha 410083, China | | | CAO Yan-Bing | School of Metallurgy and Environment, Central South University, Changsha 410083, China | |
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| Abstract: Spherical Ni0.7Co0.15Mn0.15(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-LiNi0.7Co0.15Mn0.15O2 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 LiNi0.52Co0.24Mn0.24O2 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. |
| Keywords: Lithium-ion battery cathode material full concentration-gradient element diffusion |
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| 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 LiNi0.7Co0.15Mn0.15O2 Cathode Material[J].Chinese Journal of Inorganic Chemistry,2017,33(9):1537-1546. |
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