A method of regenerating waste lithium ion battery graphite negative electrode material

Abstract

The present invention relates to a method for regenerating waste and used lithium ion battery graphite negative electrode material, comprising the following steps: (1) adding waste and used lithium ion battery negative electrode material into an acidic solution and fully mixing, and then solid-liquid separation to obtain waste graphite powder and lithium-rich solution; ( 2) Mixing additives in waste graphite powder and processing by ball milling to obtain a regenerated graphite negative electrode material doped with groups contained in the additives, wherein the rotational speed of the ball milling processing is 100-1000rpm, and the processing time is not less than 6h. The regeneration method of the present application has the advantages of simple operation, high efficiency and environmental protection, and low cost; the regenerated graphite negative electrode material obtained by the regeneration method of the present application has excellent physical and chemical properties and electrochemical properties, and realizes the efficient utilization of the graphite negative electrode material of waste lithium ion batteries.

Description

technical field [0001] The invention relates to the field of waste and used lithium ion battery treatment, in particular to a method for regenerating a graphite negative electrode material of waste and used lithium ion batteries. Background technique [0002] At present, as the energy storage device occupying the largest market share in the field of electric vehicles and energy storage, lithium-ion batteries are developing at an unprecedented speed. With the continuous expansion of the electric vehicle market, the consumption of lithium-ion batteries has also increased sharply, and the number of retired lithium-ion batteries has also increased sharply. Therefore, how to reasonably recycle and reuse lithium-ion batteries is an urgent problem to be solved. On the one hand, the inherent toxicity of battery materials is harmful to the environment. For example, when the key of lithium-ion batteries enters the environment, it may cause heavy metal pollution and organic pollution....

AI Technical Summary

Problems solved by technology

The negative electrode powder accounts for 30-40% of the weight of the battery. During the recycling process of the battery, lithium ions will sneak into the negative electrode material, so that the decommissioned lithium-ion battery usually contains a large amount of lithium, which seriously affects its electrochemical performance.

The existing waste anode materials can improve their performance through direct recycling, or improve the electrical properties of anode materials by recycling and adopting calcination, chemical and other methods. The above methods are relatively complicated and the recycling cost is also high, which limits the use of anode materials. Reuse

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