Li Chunliu, Zhang Linchao, Yang Junfeng, Xie Zhuoming, Zhang Tao, Wang Jianxin, Fang Qianfeng, Wang Xianping
Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences Hefei 230031 PR China
Department of Materials Science and Engineering, University of Science and Technology of China Hefei 230026 PR China.
RSC Adv. 2019 Jan 25;9(6):3436-3442. doi: 10.1039/c8ra09407a. eCollection 2019 Jan 22.
In this work, to improve the cyclability and high-temperature performance of cubic spinel LiMnO (LMO) as cathode materials, Nb-doped LiMnO powders coated and uncoated with AlO and/or BO were synthesized the modified solid-state reaction method. It was found that Nb-doped and BO + AlO-coated LMO powders comprising 5 μm granular agglomerated fine primary particles smaller than 350 nm in diameter exhibited superior electrochemical properties with initial discharge capacity of 101.68 mA h g; we also observed capacity retention of 96.31% after 300 cycles at room temperature (RT) and that of 98% after 50 cycles at 55 °C and 1C rate.
在本工作中，为了提高立方尖晶石LiMnO₂（LMO）作为正极材料的循环稳定性和高温性能，采用改进的固态反应法合成了未包覆和包覆有Al₂O₃和/或B₂O₃的Nb掺杂LiMnO₂粉末。结果发现，由直径小于350nm的5μm粒状团聚细初级颗粒组成的Nb掺杂和B₂O₃+Al₂O₃包覆的LMO粉末表现出优异的电化学性能，初始放电容量为101.68 mA h g⁻¹；我们还观察到，在室温（RT）下300次循环后容量保持率为96.31%，在55℃和1C倍率下50次循环后容量保持率为98%。
