Method for efficiently recovering positive electrode material of mixed lithium ion battery

A technology for ion batteries and positive electrode materials, which is applied in the field of efficient recovery of positive electrode materials for mixed lithium ion batteries, can solve the problems of comprehensive treatment and recycling of unfavorable waste batteries, separate utilization, and low purity, etc., and achieves suitability for industrial applications, loss reduction, and high purity. Effect

Active Publication Date: 2019-09-13
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN103035977A discloses a method for recovering valuable metals from waste lithium-ion batteries, but it can only recover lithium in batteries, and the lithium recovery process is long, time-consuming, low in concentration and high in cost
CN108559846A discloses a comprehensive recovery method based on solid reducing agent and concentrated sulfuric acid mixed aging treatment waste positive electrode materials, to obtain leachate containing useful elements lithium, cobalt, nickel, manganese, vanadium, but these useful elements can not be used separately, directly Prepare corresponding products, and the consumption of concentrated sulfuric acid is large
The currently disclosed waste lithium-ion battery recycling methods are all aimed at a single type of waste lithium-ion battery. The recycled products are single and have low added value, which is not conducive to the comprehensive treatment and recycling of waste batteries.
And after a series of complex treatments, there are still problems such as low recovery rate of valuable metal products and low purity

Method used

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  • Method for efficiently recovering positive electrode material of mixed lithium ion battery
  • Method for efficiently recovering positive electrode material of mixed lithium ion battery
  • Method for efficiently recovering positive electrode material of mixed lithium ion battery

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Effect test

Embodiment 1

[0047] The method for efficiently recycling the positive electrode material of the mixed lithium-ion battery specifically comprises the following steps:

[0048] (1) Disassemble waste lithium-ion batteries containing different positive electrode materials lithium manganese oxide, lithium cobalt oxide, lithium iron phosphate, and nickel-cobalt lithium manganese oxide, take 25g of positive electrode powder, and use the filtered waste lead-acid battery electrolyte and H 2 o 2 for leaching, H 2 o 2 The addition amount of the battery is 20% of the electrolyte of the waste lead-acid battery, and the solid-liquid ratio is 25g / L. The leaching temperature is 90°C and the time is 90 minutes. The leaching process also includes stirring at a stirring speed of 200 rpm to obtain the leaching solution of the mixed lithium-ion battery cathode material;

[0049] (2) with NH 4 OH adjusts the pH value of the leaching solution to 5, so that Fe 3+ and Al 3+ Precipitate, filter after keeping...

Embodiment 2

[0061] The method for efficiently recycling the positive electrode material of the mixed lithium-ion battery specifically comprises the following steps:

[0062] (1) Lithium-ion batteries containing different cathode materials lithium manganese oxide, lithium cobalt oxide, lithium iron phosphate, and nickel-cobalt lithium manganese oxide were disassembled respectively, and 25 g of positive electrode powder was taken, and mixed with 3mol / LH 2 SO 4 and H 2 o 2 Carry out leaching, the solid-to-liquid ratio is 20g / L, the leaching temperature is 95°C, and the time is 120min. The leaching process also includes stirring, and the stirring speed is 300rpm to obtain the leach solution of the mixed lithium-ion battery cathode material.

[0063] (2) Adjust the pH value of the leaching solution to 6.5 with NaOH, so that Fe 3+ and Al 3+ precipitation, followed by filtration to separate the precipitate from solution;

[0064] (3) Adjust the pH value of the remaining solution to 10, add ...

Embodiment 3

[0072] The method for efficiently recycling the positive electrode material of the mixed lithium-ion battery specifically comprises the following steps:

[0073] (1) Disassemble waste lithium-ion batteries containing different cathode materials lithium manganese oxide, lithium cobalt oxide, lithium iron phosphate, and nickel-cobalt lithium manganese oxide, take 50 g of positive electrode powder, and use the filtered waste lead-acid battery electrolyte and H 2 o 2 for leaching, H 2 o 2 The addition amount is 22% of the waste lead-acid battery electrolyte. The solid-to-liquid ratio is 40g / L, the leaching temperature is 95°C, and the time is 120min. The leaching process also includes stirring at a stirring speed of 300rpm to obtain the leaching solution of the mixed lithium-ion battery cathode material;

[0074] (2) with NH 4 OH adjusts the pH value of the leaching solution to 5.4, so that Fe 3+ and Al 3+ Precipitate, filter after keeping for 1.5h, separate the precipitate...

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Abstract

The invention discloses a method for efficiently recovering a positive electrode material of a mixed lithium ion battery. The method specifically comprises the steps of disassembling a waste lithium ion battery, and carrying out leaching with an acidic solution to obtain a leaching solution; precipitating Fe<3+> and Al<3+> by using an alkali solution, and carrying out precipitation separation; adjusting the pH value of the solution to be 9-10.5, adding Na2S to precipitate Mn<2+> and the like, and then filtering precipitates to obtain a lithium-containing solution; adding carbonate ions to carry out lithium precipitation to obtain Li2CO3 precipitates; and putting MnS, CoS and NiS precipitates into a hydrochloric acid solution with the pH value of 5.5-6.5 for enabling the MnS to be re-dissolved, carrying out filtering to separate out the Mn<2+>, dissolving the residual precipitates in the hydrochloric acid solution to release Co<2+> and Ni<2+>, and electrically depositing the Co<2+> intoCo. The solubility of the Li2CO3 at the room temperature is reduced by adding ethanol to participate in lithium ion precipitation, so that the recovery rate of Li and Co reaches more than 95%; meanwhile, other Fe<3+>, Al<3+>, Mn<2+> and Ni<2+> precipitates are recovered; and the method has the advantages of being low in cost, high in efficiency, high in recovery purity, capable of realizing valuable metal recovery and suitable for industrial application.

Description

technical field [0001] The invention relates to the technical field of recycling methods for waste lithium-ion batteries, in particular to a method for efficiently recycling positive electrode materials of mixed lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, power tools, and portable electronic devices due to their excellent properties such as high energy density, high voltage, long life, and low weight-to-volume ratio. Currently, the most common cathode material is LiMn 2 o 4 、LiFePO 4 、LiCoO 2 and Li(Ni, Co, Mn)O 2 . As fast-growing and promising alternatives to conventional internal combustion engine vehicles, electric and hybrid vehicles have been significantly developed to reduce greenhouse gas emissions to mitigate climate change. According to a McKinsey report, global EV production will grow from 3.2 million (2017) to about 18 million (2025), and eventually to 36 million in 2030 (7 years). The vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00C22B26/12C22B3/00C22B47/00
CPCC22B7/008C22B23/0461C22B26/12C22B47/00H01M10/54Y02W30/84Y02P10/20
Inventor 王欣鹏顾帅张亮叶海梅韦悦周
Owner GUANGXI UNIV
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