| Summary: | Based on the normal co-precipitation method to synthesize LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> cathode material, we propose a novel approach using a liquid nitrogen quenching method to synthesize Al<sub>2</sub>O<sub>3</sub> coated LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> 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 622-LN@Al<sub>2</sub>O<sub>3</sub>). Liquid N<sub>2</sub> quenching increased the charge/discharge capacities and the Al<sub>2</sub>O<sub>3</sub> layer increased the cycle stability at high current, to finally obtain improved electrochemical properties.
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