COBALT-FREE, LITHIUM-RICH TERNARY POSITIVE ELECTRODE MATERIAL NMA AND PREPARATION METHOD THEREOF

摘要

Disclosed is a cobalt-free, lithium-rich ternary positive electrode material NMA and a preparation method thereof. The chemical formula is Li₁ + _PNi_1-x-y-zMn_xAl_yM_zO₂, where 0.03 P 0.3, 0.1 X 0.6, 0.01 Y 0.1, 0.01 Z 0.3, M is one of, or two or more of Ce³⁺, Ti⁴⁺, Zr⁴⁺, Mg²⁺, and the precursor is nano-flaked agglomerated particles with a thickness of 30-50 nm. Main uses and advantages: expensive Co is replaced with inexpensive Mn, and a layered LiNiO ₂ phase is combined with a layered LiMnO ₂ phase by adding excess lithium (thus lithium-rich) to prepare a lithium-rich layered NMA positive electrode material. As the material is cobalt-free, the production cost is reduced by 20-30%. The capacity of the positive electrode material reaches 190-200 mAh/g, and the capacity retention rate for 100 cycles is 90-95%.