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Recycling and resource treatment method of power lithium battery

A treatment method, lithium battery technology, applied in the direction of battery recycling, recycling technology, process efficiency improvement, etc., can solve environmental and human hazards and other problems, achieve the effects of improving pollution, realizing waste gas reuse, and reducing energy consumption

Active Publication Date: 2021-11-30
GO HIGHER ENVIRONMENT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Especially in the current field, the recovery of lithium metal in lithium batteries is mainly focused on the recovery of lithium metal in positive electrode materials, while there are few studies on lithium recovery in electrolyte, which also contains lithium, and electrolytes such as LiPF 6 Electrolytes such as EC (ethylene carbonate), EMC (ethyl methyl carbonate), DMC (dimethyl carbonate) and other organic solvents are harmful to the environment and human body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A recycling treatment method for a power lithium battery, comprising the following steps:

[0058] Pretreatment: Discharge the waste power lithium battery. The specific operation is: discharge the waste power lithium battery in a discharge battery filled with 10wt% sodium chloride aqueous solution for 6 hours, and then cool it in a liquid nitrogen environment to - 225℉, and then crushed and filtered to obtain solid fragments and electrolyte;

[0059] Electrolyte Li recovery: add water and milk of lime to the electrolyte, so that calcium ions and fluoride ions fully react to form calcium fluoride precipitates, add lime milk while stirring, the volume ratio of water to electrolyte is 3:1, stop adding Stir after the milk of lime for 40 minutes, so that lithium exists in the mixed solution as lithium hydroxide;

[0060] Add 12wt% hydrochloric acid to the mixed solution until the pH value of the mixed solution is 7, react for 40 minutes, hydrochloric acid and lithium hydrox...

Embodiment 2

[0068]A recycling treatment method for a power lithium battery is carried out according to the method in Example 1, the difference is that the organic solvent mixture in the positive electrode sheet Li recovery step and the negative electrode sheet processing step is prepared by mixing the following raw materials: 30Kg waste organic carbonate solvent, 25Kg tetrahydrofuran, 20Kg N, N-dimethylformamide and 10Kg polysorbate solubilizer.

Embodiment 3

[0070] A recycling treatment method for a power lithium battery is carried out according to the method in Example 1, the difference is that the organic solvent mixture in the positive electrode sheet Li recovery step and the negative electrode sheet processing step is prepared by mixing the following raw materials: 46Kg waste organic carbonate solvent, 40Kg THF, 35Kg N, N-dimethylformamide and 25Kg polysorbate solubilizer.

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PUM

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Abstract

This application relates to the field of resource recovery and utilization, and specifically discloses a recycling treatment method for power lithium batteries, including the following steps: pretreatment to obtain electrolyte, positive electrode sheet and negative electrode sheet; electrolyte Li recovery: adding Lime milk and water, stirred, reacted to form calcium fluoride precipitate, solid-liquid separation, obtained calcium fluoride precipitate and mixed solution containing lithium and organic carbonate solvent; added hydrochloric acid to the mixed solution until the pH value of the mixed solution was 6 ‑7, then add diethyl ether, extract and separate, respectively obtain Li-containing solution and waste organic carbonate solvent, add sodium carbonate to the Li-containing solution, and react at 75‑80 °C to obtain lithium carbonate precipitation, and realize electrolyte Li recovery , The preparation method of the present application has the advantage of realizing the resource recovery and utilization of lithium iron phosphate waste batteries, especially realizing the resource utilization of the electrolyte.

Description

technical field [0001] The present application relates to the technical field of resource reuse, and more specifically, it relates to a method for recycling power lithium batteries. Background technique [0002] Compared with other types of batteries, lithium iron phosphate batteries have a longer cycle life and better safety performance. Therefore, they are widely used in electric vehicles and are the main type of power battery production in my country. [0003] However, because the average service life of lithium iron phosphate batteries is limited, less than 5 years, with the rapid development of my country's electric vehicle industry, more and more waste lithium iron phosphate batteries will be produced in my country every year. Without effective treatment and recycling, it will cause certain pollution to the environment. On the other hand, lithium batteries currently occupy a dominant position in the field of power batteries. With the development of new energy sources, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B21/00C22B26/12H01M10/54
CPCC22B7/006C22B7/007C22B21/0023C22B26/12H01M10/54Y02W30/84Y02P10/20
Inventor 陈福泰翟玉斌杜学兰
Owner GO HIGHER ENVIRONMENT GRP CO LTD