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

Active Publication Date: 2017-07-25
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the process of recovering lithium titanate negative electrode material is complex and cannot achieve the purpose of large-scale industrialization, and provides a method for recovering and preparing titanium from waste lithium titanate batteries. Lithium Oxide Negative Electrode Material to solve the problem of difficult industrialization of lithium titanate material recovery

Method used

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

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Embodiment 1

[0038] Put 500kg of lithium titanate battery pole pieces that have been discharged and separated into the separation pool. The solvent of the separation pool is a mixed solvent of NMP, DMF and acetone with a mass ratio of 1:1:1. The temperature of the separation pool is 55°C, and the immersion time is For 24 hours, the separation cell ultrasonically turns on the high-frequency mode. The current collector was washed, dried and recovered, and the battery slurry solution in the separation tank was transferred to a filter press to separate the battery slurry solution from solid to liquid, and the moisture content of the separated mixture was detected to be 10.2%. Put the mixture obtained by pressure filtration into a pusher furnace, sinter at 500°C for 4.5 hours, pass compressed air all the time during the sintering process, and cool to room temperature with the furnace to obtain lithium titanate from which the carbon material conductive agent has been removed.

[0039] Re-add lit...

Embodiment 2

[0042] Put 500kg of lithium titanate battery pole pieces that have been discharged and separated into the separation pool. The solvent of the separation pool is a mixed solvent of NMP, DMF and acetone with a mass ratio of 1:1:1. The temperature of the separation pool is 55°C, and the immersion time is For 24 hours, the separation cell ultrasonically turns on the high-frequency mode. The current collector was washed, dried and recovered, and the battery slurry solution in the separation tank was transferred to a filter press to separate the battery slurry solution from solid to liquid, and the moisture content of the separated mixture was detected to be 11.7%. Put the mixture obtained by pressure filtration into a pusher furnace, sinter at 500°C for 4.5 hours, pass compressed air all the time during the sintering process, and cool to room temperature with the furnace to obtain lithium titanate from which the carbon material conductive agent has been removed.

[0043]Re-add lith...

Embodiment 3

[0046] Put 500kg of lithium titanate battery pole pieces that have been discharged and separated into the separation pool. The solvent of the separation pool is a mixed solvent of NMP, DMF and acetone with a mass ratio of 1:1:1. The temperature of the separation pool is 55°C, and the immersion time is For 24 hours, the separation cell ultrasonically turns on the high-frequency mode. The current collector was washed, dried and recovered, and the battery slurry solution in the separation tank was transferred to a filter press to separate the battery slurry solution from solid to liquid, and the moisture content of the separated mixture was detected to be 9.7%. Put the mixture obtained by pressure filtration into a pusher furnace, sinter at 500°C for 4.5 hours, pass compressed air all the time during the sintering process, and cool to room temperature with the furnace to obtain lithium titanate from which the carbon material conductive agent has been removed.

[0047] Re-add lith...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/485
CPCH01M4/485H01M10/54Y02E60/10Y02W30/84
Inventor 李旺刘佳丽卞沛文万玲玉潘光杰
Owner SHANGHAI ELECTRICGROUP CORP
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