Method for repairing and regenerating nickel cobalt manganese ternary positive electrode material in waste battery

Abstract

The invention provides a method for repairing and regenerating a nickel cobalt manganese ternary positive electrode material in a waste battery. The method comprises the following steps: splitting an positive electrode material from a lithium cobalt oxide waste battery; laying the ternary positive electrode material on a mesh belt, controlling the mesh belt to continuously vibrate, and controlling gas to pass through meshes of the mesh belt from bottom to top; under the conditions that the mesh belt vibrates and gas flows through the meshes of the mesh belt, respectively heating a ternary positive electrode slice at the temperature of 100 to 300 DEG C and the temperature of 380 to 520 DEG C for 10 to 60 minutes, and collecting ternary positive electrode material powder I; sequentially sieving the ternary positive electrode material powder I to remove a broken aluminum foil and performing electromagnetic iron removal on the ternary positive electrode material powder I to obtain ternary positive electrode material powder II, and performing ball milling on the ternary positive electrode material powder II to obtain ternary positive electrode material powder III; dissolving aluminum powder by the ternary positive electrode material powder III under the condition of weak acid, corroding the surface of the ternary positive electrode material to form the ternary positive electrode material with high activity and high dispersity, and synthesizing and repairing the ternary positive electrode material serving as a nucleating agent to obtain a spherical ternary precursor material with uniform particles. The size mixing and coating properties and electrochemical properties of the spherical ternary precursor material prepared by the method provided by the invention are repaired.

Description

technical field [0001] The invention relates to the recycling of waste batteries, in particular to a method for repairing and regenerating nickel-cobalt-manganese ternary positive electrode materials in waste batteries. Background technique [0002] Since its commercialization, lithium-ion batteries have been widely used in civilian and military fields, such as cameras, Mobile phones, notebook computers, and portable thermometers, etc., while lithium-ion batteries are also one of the preferred light-weight high-energy power batteries for electric vehicles. [0003] After 500-1000 charge and discharge cycles of a lithium-ion battery, its active material will lose its activity, resulting in a decrease in the capacity of the battery and causing the battery to be scrapped. Lithium-ion battery recycling technology can be divided into wet recycling and fire recycling. Wet methods include pretreatment (dismantling, sorting, etc.) and recovery of cobalt and other metals. For th...

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Problems solved by technology

Pyrochemical recovery requires high investment in equipment and high pressure on environmental protection. Metals need to be further processed before they can be used, and the cost is high.

[0005] In the prior art, regardless of wet recycling or fire recycling, metals such as Co and Li in waste batteries are recycled as raw materials, which has a long process and high recycling costs.

[0006] The ternary cathode material powder obtained from the dismantling and recycling of waste batteries, due to the continuous charging and discharging process, some of the particles are broken into fine particles, and the particle distribution becomes wider. Poor, uneven coating thickness, affecting battery performance

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