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Synthesis of High-performance LiNi0.6Co0.2Mn0.2O2 Cathode Material for Lithium-ion Batteries by Using a Four Times Liquid Nitrogen Quenching Method and an Al2O3 Coating Method

1
National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
2
Yunnan Jingxi New Material Technology Co., Ltd., Qujing 655000, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(22), 3666; https://doi.org/10.3390/ma12223666
Received: 10 October 2019 / Revised: 31 October 2019 / Accepted: 4 November 2019 / Published: 7 November 2019
Based on the normal co-precipitation method to synthesize LiNi0.6Co0.2Mn0.2O2 cathode material, we propose a novel approach using a liquid nitrogen quenching method to synthesize Al2O3 coated LiNi0.6Co0.2Mn0.2O2 cathode material. In the whole process, liquid nitrogen was used four times to quench the materials from high temperatures (50 °C, 750 °C, 90 °C, 500 °C) to −196 °C rapidly in four stages. Various characterizations proved that this method could help to improve the electrochemical performance of lithium-ion batteries. Especially at 5 C rate current, after 100 cycles, the specific discharge capacities were 24.5 mAh/g (LNCM 622), 43.8 mAh/g (LNCM 622-LN), and 53.9 mAh/g (LNCM [email protected]2O3). Liquid N2 quenching increased the charge/discharge capacities and the Al2O3 layer increased the cycle stability at high current, to finally obtain improved electrochemical properties. View Full-Text
Keywords: lithium ion batteries; LiNi0.6Co0.2Mn0.2O2; liquid nitrogen; Al2O3; electrochemical performance lithium ion batteries; LiNi0.6Co0.2Mn0.2O2; liquid nitrogen; Al2O3; electrochemical performance
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Yang, W.; Zuo, Y.; Chen, Q.; Zhang, Y. Synthesis of High-performance LiNi0.6Co0.2Mn0.2O2 Cathode Material for Lithium-ion Batteries by Using a Four Times Liquid Nitrogen Quenching Method and an Al2O3 Coating Method. Materials 2019, 12, 3666.

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