放射状NCM811电极材料制备及性能评价

Preparation and Evaluation of Radioactive NCM811 Electrode Material

锂离子正极材料种类多样,层状结构型材料因较好的适用性,得到了广泛应用,但也存在不少问题,三元正极材料应运而生。由于镍钴铝(NCA)三元材料生产制备要求高,工艺简单的NCM三元材料率先实现了部分商用,富镍型NCM811 (LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2))仍处在研究阶段,尚未大量使用。采用共沉淀法-高温固相法相结合的方式制备放射状NCM811 (RA-NCM811),对材料微观形貌、元素分布、晶体结构等进行表征分析,发现材料呈二次类球体,具有放射状结构,构筑了三维扩散通道,元素分布符合要求,晶胞参数表明制备出了RA-NCM811电极材料;对电化学性能进行评价,发现基于RA-NCM811的电池能量密度、循环稳定性、倍率性能等性能均十分优异。通过制备、评价RA-NCM811电极材料,为进一步研究高能量密度电池提供了依据。

There are many kinds of lithium-ion cathode materials, among which layered structure materials are widely used because of their good applicability though with many problems. Due to the high requirement of Nickel-Cobalt-Aluminium(NCA) class ternary materials, simple NCM class ternary materials have achieved some commercial applications. Nickel-rich NCM811 (LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)) is still in the research stage and has not been widely used. Radioactive NCM811(RA-NCM811) was prepared by co-precipitation and high temperature solid-state method. The microstructure, element distribution and crystal structure of the material were characterized. RA-NCM811 electrode material of was then prepared, which was proved by the crystal cell parameters. The electrochemical performance was evaluated by the assembly of the battery and it was found that the performance of the cell based on RA-NCM811 was very good, such as energy density, cycle stability, rate performance, etc. The preparation and evaluation of RA-NCM811 electrode material provide a basis for further research on high energy density battery.