Recycling method and recycling equipment for positive electrode active material of lithium ion battery

Abstract

The invention provides a recovery method and recovery equipment for a positive active material of a lithium ion battery, and the recovery method comprises the following steps: (1) soaking a scrapped positive plate in NMP (N-Methyl Pyrrolidone), heating to dissolve a binder in the positive plate in the NMP, and filtering and drying to obtain a positive waste material; and (2) adding LiNO3 and LiOH eutectic lithium salt into the positive electrode waste material, uniformly mixing, carrying out lithium supplement repair by adopting a solid phase method, and then carrying out high-temperature sintering. According to the method, the binder is dissolved through NMP, so that the positive electrode waste material can be separated from the current collector, then solid-phase lithium supplement repair is carried out on the positive electrode waste material and the eutectic lithium salt, and then high-temperature sintering is carried out, so that the positive electrode active material is obtained. The eutectic lithium salt is adopted, the sintering temperature of the eutectic lithium salt is low, the molten lithium salt can permeate into the surface and the interior of the positive electrode waste material at the low sintering temperature, and the sintered and repaired positive electrode active material can be more uniform. The solid-phase method is adopted for one-step sintering, the recovery rate is high, and the situation that an intermediate product needs to be prepared firstly and then cleaned and calcined in a hydrothermal reaction can be avoided.

Description

technical field [0001] The present invention relates to the technical field of materials preparation and processing related technologies and equipment, in particular to a recovery method and recovery equipment, and more particularly to a recovery method and recovery equipment for positive electrode active materials of lithium-ion batteries. Background technique [0002] With the advantages of high energy density, high voltage, good cycle performance, small self-discharge, long storage time, safe operation, wide temperature range, and environmental friendliness, lithium-ion batteries gradually replace traditional nickel-cadmium batteries and nickel-hydrogen batteries, and the market The share is increasing year by year. Precious metal resources in lithium-ion batteries are concentrated in the casing, current collector, and positive electrode active materials. [0003] At present, in addition to the early commercialized lithium cobalt oxide, the commonly used cathode active m...

AI Technical Summary

Problems solved by technology

However, the traditional fire recovery process has the problems of high energy consumption and low recovery rate. Although the wet process has a high recovery rate, it also has problems such as low metal separation rate, high cost, complicated process, and serious environmental pollution.

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