特殊结构前驱体对锂电池三元正极材料性能的提升

When preparing precursors, materials with various morphologies can be obtained by controlling different reaction conditions. Notably, the ammonia condition significantly affects morphology. Herein, high-nickel ternary precursor materials with different morphologies were prepared under different ammonia conditions. It was found that the precursor prepared under low-ammonia condition had fine whiskers on the surface, dense internal structure, and branching-like external structure. After sintering the precursor material, the primary particles still grew radially, and more slender than in other conditions. After fabricating the button battery, the capacity reached 210.3 mA·h/g at 0.2 C discharge, and the first charge-discharge efficiency reached 93.05%, with excellent cycle and rate performance. Herein, the discharge capacity of the device increased by 3% compared with the same ratio of commercial devices. The morphology control method provides a new idea for the large-scale preparation of high specific capacity ternary cathode materials.

Keywords： lithium-ion battery ; precursor ; cathode ; ammonia value ; morphology ; specific capacity