A method for regenerating waste lithium nickel cobalt manganate ternary cathode material

Abstract

The invention discloses a method for regenerating waste lithium nickel cobalt manganate ternary cathode material of. The method comprises lixiviating the waste lithium nickel cobalt manganate ternarycathode material by using phosphoric acid- citric acid mixed acid solution to obtain a lixivium; adjusting the metal ion ratio of the lixivium by a nickel salt, a cobalt salt and a manganese salt, andthen adding the lixivium into an oxalic acid solution for coprecipitation reaction; pre-calcining the obtained precipitate to obtain nickel cobalt manganese oxide, and grinding and mixing the nickelcobalt manganese oxide with a lithium source, calcining a resultant object to obtain a regenerated lithium nickel cobalt manganate ternary cathode material; The method adopts mixed acid lixiviating process, the acid consumption is small, the lixiviating time is short, the cost is low, the environmental impact is small, and the reducing agent is not needed, and the process is simple; The mixed acidlixivium is directly used for synthesizing ternary cathode materials, thereby avoiding the complicated process of separating and purifying various metals in the lixivium in the prior art, and realizing the closed-loop recycling utilization of metals.

Description

technical field [0001] The present invention relates to a recycling method of nickel-cobalt-lithium-manganese-manganate ternary positive electrode material of waste lithium-ion batteries, in particular to a waste lithium-ion battery nickel-cobalt-lithium-manganese-oxide ternary positive electrode waste through mixed acid leaching, co-crystallization precipitation and high-temperature solid phase The method for realizing regeneration by reaction belongs to the technical fields of secondary resource recovery and utilization and circular economy. Background technique [0002] With the development and popularization of portable electronic devices and electric vehicles, the use of lithium-ion batteries has increased dramatically, while generating a large amount of solid waste of lithium-ion batteries. Studies have shown that by 2020, China's discarded lithium-ion batteries will reach 25 billion, and their quality will reach 500,000 tons. Due to the high content of heavy metals a...

AI Technical Summary

Problems solved by technology

For the metal separation and recovery process, precipitation, solvent extraction, and crystallization methods are usually used to separate and recover metals in the leachate after leaching the positive electrode waste. The closed-loop circulation of the metal components in the positive electrode waste has not been realized, and there are serious secondary pollution and impure products. , complex recycling process, high recycling cost and other disadvantages

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