Method for double-effect molten salt low-temperature regeneration of waste lithium cobalt oxide positive electrode material

Abstract

The invention discloses a method for double-effect molten salt low-temperature regeneration of a waste lithium cobalt oxide positive electrode material, which comprises the following steps: mixing a waste lithium cobalt oxide battery positive electrode material with a molten salt system, grinding the mixture, carrying out low-temperature sintering, washing the sintered product with water, and conducting drying to obtain a regenerated lithium cobalt oxide positive electrode material. The method does not need an acid leaching process, can avoid secondary environment pollution, and is environment-friendly; the method only needs to be carried out in a low-temperature environment, energy consumption is reduced, and cost is reduced; the waste lithium ion battery positive electrode material can be directly adopted as a raw material so as to achieve the resource recycling, the addition amount of the required lithium source does not need to be changed according to different waste degrees during the preparation process, and only the mixing according to the fixed ratio is needed, such that the molten salt system can meet the requirements of different lithium supplementing amounts, the reaction temperature can be reduced as a medium, regeneration is completed in one step, and the application range is wide.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for regenerating waste lithium cobalt oxide cathode materials at low temperature with double-effect molten salts. Background technique [0002] Lithium-ion battery is a rechargeable secondary battery that mainly relies on lithium ions to move between positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. In the Chinese market, lithium cobalt oxide is widely used due to its high energy density, high voltage and other advantages, but in the process of repeated charging and discharging, the irreversible conversion of lithium ions has become the main r...

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Problems solved by technology

[0003] Common recycling methods include wet leaching, high-temperature solidification, etc. These methods are prone to secondary pollution of acid or high energy consumption and high cost, which do not conform to the new concept of "green chemistry"

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