Yang Wenyuan, Zuo Yinze, Chen Qi, Zhang Yan
National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.
Yunnan Jingxi New Material Technology Co., Ltd., Qujing 655000, China.
Materials (Basel). 2019 Nov 7;12(22):3666. doi: 10.3390/ma12223666.
Based on the normal co-precipitation method to synthesize LiNiCoMnO cathode material, we propose a novel approach using a liquid nitrogen quenching method to synthesize AlO coated LiNiCoMnO 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@AlO). Liquid N quenching increased the charge/discharge capacities and the AlO layer increased the cycle stability at high current, to finally obtain improved electrochemical properties.
基于常规共沉淀法合成LiNiCoMnO正极材料，我们提出了一种使用液氮淬火法合成AlO包覆的LiNiCoMnO正极材料的新方法。在整个过程中，液氮分四个阶段使用四次，将材料从高温（50℃、750℃、90℃、500℃）快速淬火至-196℃。各种表征证明，该方法有助于提高锂离子电池的电化学性能。特别是在5C倍率电流下，经过100次循环后，比放电容量分别为24.5mAh/g（LNCM 622）、43.8mAh/g（LNCM 622-LN）和53.9mAh/g（LNCM 622-LN@AlO）。液氮淬火提高了充放电容量，AlO层提高了高电流下的循环稳定性，最终获得了改善的电化学性能。
