The application belongs to the technical field of
lithium ion battery recycling and regeneration, and discloses a method for repairing NCM92 positive
electrode material recycling by
dielectric material, wherein waste positive
electrode material is pretreated to obtain NCM92 positive
electrode powder;
barium titanate or
strontium titanate dielectric material is ground and sieved; the NCM92 positive electrode
powder is divided into multiple portions, the
dielectric material is mixed with the positive electrode
powder in a gradient increasing adding amount, and then dried;
lithium source is added to each
intermediate product and uniformly mixed; finally, high-temperature
sintering, crushing and sieving are performed to obtain regenerated NCM92 positive
electrode material. The core of the application is that by gradient adding of the dielectric material
barium titanate or
strontium titanate, the bulk structure repair of the positive
electrode material, the
elimination of the surface residual potential and the construction of the functional
coating layer are simultaneously realized in the high-temperature
sintering process, so that the first efficiency, the cycle stability and the rate performance of the regenerated material are significantly improved. The method has simple process, good regeneration effect and low cost, and provides a new way for realizing high-value direct regeneration of the NCM92 positive
electrode material of the retired
lithium ion battery.