锂离子电池高镍三元正极材料LiNi1-x-yCoxMnyO2的改性研究进展

Research Progress in Modifications of Ni-rich Ternary Cathode Material(LiNi1-x-yCoxMnyO2) for Lithium-ion Batteries

新能源产业的快速发展对储能材料与器件的综合性能提出了更高的要求。锂离子电池正极材料,尤其是高镍三元材料(LiNi1-x-yCoxMnyO2)具有高能量密度、高工作电压及优异的化学稳定性等特点,因而被认为是下一代动力电池商业化正极材料的优越选择。系统总结了高镍三元材料LiNi1-x-yCoxMnyO2的优势并指出了其亟待解决的问题;在此基础上,综述了其各类改性方法,包括各类阴阳离子掺杂、表面包覆、浓度梯度材料设计以及石墨烯复合等方法;最后对其发展方向及商业化应用进行了展望。

With the rapid development of new energy industry,higher requirements have been put forward for the comprehensive performance of energy storage materials and devices.Lithium-ion cathode materials,especially Ni-rich ternary material(LiNi1-x-yCoxMnyO2),are considered as one of the superior candidates for commercialized cathode materia-ls for the next generation power batteries owing to their high energy density,high working voltage,excellent chemical stability,etc.The advantages of Ni-rich ternary material LiNi1-x-yCoxMnyO2 are summarized systematically,and the urgent problems are pointed out.On this basis,their modification methodologies are reviewed,including doping cations and anions,surface coating,design of concentration gradient materials,and graphene compounding.Finally,the development directions and commercial applications in the future are projected.