HIGH-COMPACTED-DENSITY POSITIVE ELECTRODE MATERIAL AND ELECTROCHEMICAL ENERGY STORAGE APPARATUS

摘要

This application relates to the field of battery technologies, and in particular, to a high-compacted-density positive electrode material and an electrochemical energy storage apparatus. The positive electrode material includes a lithium-nickel transition metal oxide A and a lithium-nickel transition metal oxide B. The lithium-nickel transition metal oxide A is secondary particles, whose chemical formula is shown in formula I: Li_a1(Ni_b1Co_c1Mn_d1)_x1M_1-x1O_2-e1X_e1. The lithium-nickel transition metal oxide B is a monocrystalline structure or a monocrystalline-like structure, whose chemical formula is shown in formula II: Li_a2(Ni_b2Co_c2Mn_d2)_x2M′_1-x2O_2-e2X′_e2 (II). The positive electrode material of this application includes the large-particle lithium-nickel transition metal oxide A and the small-particle lithium-nickel transition metal oxide B to improve an energy density of the battery. A degree of crystallinity and particle size distribution of the mixed positive electrode material can improve a compacted density of the high-nickel active material, and ensure lower gassing and good cycle performance.