Method for recycling and preparing lithium titanate negative electrode material from waste lithium titanate battery

A technology of lithium titanate battery and negative electrode material, which is applied in battery recycling, battery electrode, waste collector recycling and other directions, can solve the problems of complex process, difficult industrialization of lithium titanate material recovery, and inability to achieve large-scale industrialization, etc. Process controllable effects
CN106981698AActive Publication Date: 2017-07-25SHANGHAI ELECTRICGROUP CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI ELECTRICGROUP CORP
Publication Date
2017-07-25

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Abstract

The invention discloses a method for recycling and preparing a lithium titanate negative electrode material from a waste lithium titanate battery. The method comprises the steps of 1) performing discharging and shell disassembly on the waste lithium titanate battery to separate a pole plate, placing the waste lithium titanate battery in a separation pool, and performing heating and impregnation so that an electrode material and a current collector are separated, wherein a solvent in the separation pool is a mixed solvent formed from N-methyl pyrrolidone, dimethyl phthalate and acetone according to a mass ratio being (5-0.5):(5-0.1):(2-0.1); 2) performing solid-liquid separation on the lithium titanate battery material paste of which the current collector is separated; 3) sintering a mixture, and removing a conductive carbon material; 4) uniformly mixing the lithium titanate material, a conductive coating agent, a doping agent and a lithium salt material, and ball-milling the mixture to nanoscale by a wet method; 5) performing spray granulation on the nanometer lithium titanate mixed paste; 6) performing high-temperature calcination on a lithium titanate precursor; and 7) smashing the lithium titanate material, and performing inflation and package. The recycle method provided by the invention is controllable in process and low in cost, and industrialization can be achieved.
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Description

technical field

[0001] The invention relates to a method for recycling and preparing lithium titanate negative electrode materials from waste lithium titanate batteries. Background technique

[0002] At present, there are few patents on the recycling and reuse of lithium titanate negative electrode materials, and most of them are used to recycle lithium battery positive electrode materials. The recycling of positive and negative electrode materials for lithium-ion batteries is mostly concentrated in the laboratory recycling stage, and there are few process routes suitable for industrial recycling production.

[0003] For example, the Chinese patent application with publication number CN105990617A discloses a method for recovering and regenerating spent lithium-ion battery electrode materials. The method includes dismantling waste lithium ion batteries, sorting pole pieces, soaking in ammonia water, washing and drying. The obtained positive and negative electrode sheets are...

Claims

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