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Lithium recovery process of waste lithium ion batteries

A lithium-ion battery and waste technology, applied in the field of lithium recovery technology, can solve the problems of difficult purification, long process, waste, etc., and achieve the effect of efficient recovery, simple process and high recovery rate

Inactive Publication Date: 2019-11-01
先进储能材料国家工程研究中心有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of new energy vehicles, a large number of lithium-ion batteries have entered the market, but lithium-ion batteries have a certain service life and need to be replaced after a period of use, resulting in more waste lithium-ion batteries, and waste lithium-ion batteries contain A lot of valuable metals, if not treated, will cause a lot of waste, and will also cause pollution to the environment. Therefore, the recycling and reuse of waste lithium-ion batteries has become a major challenge for the industry
The recovery of lithium from traditional waste lithium-ion batteries is basically carried out through steps such as acid leaching, impurity removal, extraction and separation, which has problems such as long process, large investment, low recovery rate due to lithium inclusions, and difficult purification treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of lithium reclaiming process of waste and old lithium ion battery, carries out according to the following steps,

[0019] (a) Crushing and sorting waste lithium-ion batteries to obtain positive and negative electrode active material powders and separators; crushing includes two steps of coarse crushing and fine crushing; after testing, the nickel in the positive and negative electrode active material powders obtained by sorting The mass content is 16%, the mass content of cobalt is 10%, the mass content of manganese is 15%, and the mass content of lithium is 7%, and the separator component obtained by sorting is polyethylene;

[0020] (b) Place the positive and negative active material powder and separator obtained by sorting in step (a) into a roasting furnace with a temperature of 600° C. for 3 h, wherein the added mass of the separator is 11% of the added mass of the positive and negative active material powder %;

[0021] (c) leaching the roasted product ob...

Embodiment 2

[0024] A kind of lithium recovery process of waste lithium ion battery, its step is basically the same as the step of the lithium recovery process of waste lithium ion battery in embodiment 1, and its difference is:

[0025] 1. In step (a), after testing, in step (a), the mass content of nickel in the positive and negative electrode active material powder obtained by sorting is 19%, the mass content of cobalt is 8%, and the mass content of manganese is 18%, The mass content of lithium is 5%, and the separator components obtained by sorting are polyethylene and polypropylene;

[0026] 2. In step (b), the temperature of the roasting furnace is controlled at 650° C., the mass of the separator is 20% of the mass of the positive and negative active material powders, and the roasting time is controlled at 5 hours;

[0027] 3. In step (c), the solid-to-liquid ratio of the roasted product to the oxalic acid solution is 15g:1L, the molar concentration of oxalic acid is 1.5mol / l, the le...

Embodiment 3

[0030] A kind of lithium recovery process of waste lithium ion battery, its step is basically the same as the step of the lithium recovery process of waste lithium ion battery in embodiment 1, and its difference is:

[0031] 1. In step (a), after testing, in step (a), the mass content of nickel in the positive and negative electrode active material powder obtained by sorting is 17%, the mass content of cobalt is 7%, the mass content of manganese is 15.5%, The mass content of lithium is 6%, and the separator components obtained by sorting are polyethylene and polypropylene;

[0032] 2. In step (b), the temperature of the roasting furnace is controlled at 625° C., the mass of the separator is 18% of the mass of the positive and negative active material powders, and the roasting time is controlled at 4 hours;

[0033] 3. In step (c), the solid-to-liquid ratio of the roasted product to the oxalic acid solution is 45g:1L, the molar concentration of oxalic acid is 2mol / l, the leachi...

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Abstract

The invention provides a lithium recovery process of waste lithium ion batteries. The process comprises the following steps of firstly crushing the waste lithium ion batteries and then sorting out toobtain positive and negative electrode active material powder and diaphragms; placing the sorted positive and negative electrode active material powder and diaphragms in a roasting furnace for roasting for a certain period of time based on a certain mass ratio at the temperature of 600 DEG C-650 DEG C; leaching roasting product through using oxalic acid solution and then filtering to obtain nickel-cobalt-manganese slag and lithium oxalate solution; adding calcium hydroxide into the lithium oxalate solution for reaction, and filtering to obtain lithium hydroxide solution and calcium oxalate; and finally, adding sulfuric acid into the obtained calcium oxalate for acidifying treatment, and then filtering to obtain oxalic acid solution. The method has the advantages of being simple and novel in process and high in the purity of the obtained lithium hydroxide solution and the recovery rate.

Description

technical field [0001] The invention relates to a lithium recovery process for waste lithium ion batteries. Background technique [0002] With the development of new energy vehicles, a large number of lithium-ion batteries have entered the market, but lithium-ion batteries have a certain service life and need to be replaced after a period of use, resulting in more waste lithium-ion batteries, and waste lithium-ion batteries contain A lot of valuable metals, if not treated, will cause a lot of waste, and will also cause pollution to the environment. Therefore, the recycling and reuse of waste lithium-ion batteries has become a major challenge for the industry. The recovery of lithium from traditional waste lithium-ion batteries is basically carried out through steps such as acid leaching, impurity removal, extraction and separation, which has problems such as long process, large investment, low recovery rate due to lithium inclusions, and difficult purification treatment. C...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B26/12C22B3/16H01M10/54
CPCC22B1/02C22B3/165C22B7/007C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 钟发平杨先锋黄林波
Owner 先进储能材料国家工程研究中心有限责任公司
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