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A method for recovering lithium from lithium-ion battery waste electrolyte

A lithium-ion battery and waste electrolyte technology, which is applied in the field of lithium recovery, can solve problems such as harming the health of on-site workers and polluting the environment with hydrogen fluoride gas, and achieves the effect of short recovery process, clean and efficient utilization

Active Publication Date: 2020-04-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, this has caused problems that hydrogen fluoride gas pollutes the environment and endangers the health of on-site workers. On the other hand, the obtained lithium salt must undergo complex subsequent transformations before it can be used again for the synthesis of lithium-ion battery materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation containing 0.1mol / L KCl and 0.4mol / L C 8 h 20 The mixed solution of ClN was 310 milliliters, and 150 milliliters of lithium ion waste electrolyte was added while stirring at room temperature, and the stirring reaction was continued for 180 minutes after the addition was completed. After the stirring reaction was completed, the precipitate and lithium-containing solution were separated by filtration. KOH was added to the separated lithium-containing solution to adjust the pH value to 13, and the reaction was heated at 60° C. for 60 minutes. After the solution was cooled, it was filtered to obtain a purified solution. Heat the purified solution to 90°C and add 30mL of 300g / L sodium carbonate solution while stirring, continue to react for 120 minutes after the addition is completed, filter immediately after the reaction is completed, wash the obtained lithium carbonate with hot water and dry at 100°C for 12 hours, weigh The recovery rate of lithium was calcul...

Embodiment 2

[0037] The operating process is the same as in Example 1, except that the preparation contains KCl and NH 4Cl concentration is 1mol / L mixed solution 205 milliliters, 150 milliliters of lithium ion spent electrolyte solution is added while stirring at 60 ℃, continue to stir and react for 60 minutes after the addition is complete. After the stirring reaction was completed, the precipitate and lithium-containing solution were separated by filtration. KOH was added to the separated lithium-containing solution to adjust the pH value to 10, and the reaction was heated at 40° C. for 30 minutes, and the solution was cooled and then filtered to obtain a purified solution. Heat the purified solution to 70°C and add 30mL of 300g / L sodium carbonate solution while stirring, continue to react for 30 minutes after the addition is completed, filter immediately after the reaction is completed, wash the obtained lithium carbonate with hot water and dry at 100°C for 12 hours, weigh The recovery...

Embodiment 3

[0039] The operation process is the same as that of Example 1, except that the preparation contains 0.5mol / L KCl and 0.5mol / L Ni(NH 3 ) 6 Cl 2 155 milliliters of the mixed solution, 150 milliliters of lithium-ion waste electrolyte was added while stirring at 30° C., and the stirring reaction was continued for 90 minutes after the addition was completed. After the stirring reaction was completed, the precipitate and lithium-containing solution were separated by filtration. KOH was added to the separated lithium-containing solution to adjust the pH value to 12, and the reaction was heated at 60° C. for 60 minutes, and the solution was cooled and then filtered to obtain a purified solution. Heat the purified solution to 90°C and add 30mL of 300g / L sodium carbonate solution while stirring, continue to react for 60 minutes after the addition is completed, filter immediately after the reaction is completed, wash the obtained lithium carbonate with hot water and dry at 100°C for 12...

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Abstract

The invention relates to a method for recycling lithium from a lithium ion battery waste electrolyte, and belongs to the technical field of resources cyclic utilization. The invention aims to providethe method for recycling the lithium from the lithium ion battery waste electrolyte. The method is mainly characterized by mixing and reacting the waste electrolyte and a halogenide solution containing a large positive ionic radius, wholly separating PF6- in the electrolyte, deeply purifying the lithium-containing solution after separation, and precipitating the lithium to obtain lithium carbonate, so that the aim of cleanly and high-efficiently utilizing the lithium ion battery waste electrolyte is achieved.

Description

technical field [0001] The invention relates to a method for recovering lithium from waste electrolyte of a lithium ion battery, and belongs to the technical field of resource recycling. [0002] technical background [0003] Lithium-ion batteries are widely used in the mobile electronic communication market due to their advantages such as high specific energy, long cycle life, and no memory effect, and have also become one of the preferred power batteries for pure electric vehicles. With the rapid development of the lithium-ion battery industry, the demand for related battery materials continues to grow. When preparing electrode materials for lithium-ion batteries, whether it is the early LiCoO 2 Or the LiMn that was gradually developed in the later stage 2 o 4 、LiFePO 4 Or ternary materials, without exception, must use high-purity lithium salts as raw materials, mainly lithium carbonate or lithium hydroxide. Due to the influence of reactivity, etc., lithium phosphate i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 陈亚曹利涛关杰豪甘辉陈白珍石西昌
Owner CENT SOUTH UNIV
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