Solid phase regeneration method of waste ternary lithium ion battery positive electrode material

Abstract

The invention discloses a solid phase regeneration method of a waste ternary lithium ion battery positive electrode material. The solid phase regeneration method comprises the following steps of (1) performing battery refined dismantling, taking out a positive electrode plate, and performing washing and drying on the positive electrode plate; (2) performing heat treatment on the positive electrodeplate at a temperature of 300-500 DEG C to realize screening and separating of a ternary positive electrode material and an aluminum foil or a conductive agent; (3) performing elemental analysis on the ternary positive electrode material and then matching with a lithium source, a cobalt source, a nickel source and a manganese source to adjust the element molar ratio; (4) performing mixing and ball milling on the added lithium source, cobalt source, nickel source and manganese source, and performing high-temperature sintering in an inert atmosphere or vacuum atmosphere to obtain a pre-sinteredsolid body; and (5) next, adding the conductive agent and doped metal ions, and performing secondary sintering in the air atmosphere to obtain the battery positive electrode material. The solid phaseregeneration method of the waste ternary lithium ion battery positive electrode material provided by the invention has the characteristics of simple operation, economic and reasonable property, highcycle recovery rate and environment friendliness.

Description

technical field [0001] The invention relates to the technical field of nickel-cobalt-manganese ternary materials, in particular to a method for solid-phase regeneration of spent ternary lithium-ion battery cathode materials. Background technique [0002] Lithium-ion batteries are widely used in various electronic devices due to their advantages such as high working voltage, high energy density, small self-discharge, long life, and no memory effect. Unlike other types of chemical power systems, the positive and negative electrode materials of lithium-ion batteries are still in constant innovation and development. Taking the cathode material as an example, the most commercialized lithium-ion battery uses layered LiCoO2, and then develops olivine-like LiFePO4. Due to the continuous improvement of national policies and industry standards, the specific capacity is larger and the cycle life is longer. The layered LiNixCoyMnz ternary cathode material with higher charge and dischar...

AI Technical Summary

Problems solved by technology

However, due to the complex and cumbersome process, a large amount of acid-base solution is used in the process, which increases the cost and lowers the recovery efficiency.

Therefore, it is not suitable for industrial cycle production

[0004] There are also some other recovery methods, such as CN 103199320 B (method for recycling nickel-cobalt-manganese ternary positive electrode materials), which adopts the method of liquid phase repair and regeneration. After dissolving the mixed acid solution, metal soluble salts are added, and then the complex is carried out. Although this method is feasible, it still has the disadvantages of complex process and large consumption of auxiliary materials.

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