Recovery method for electrolyte of waste lithium ion battery

A lithium-ion battery and electrolyte recycling technology, which is applied in battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of low recovery rate, complicated recycling process, and low safety, so as to avoid secondary pollution , The process is simple and efficient, and the effect of safety is good

Active Publication Date: 2017-05-17
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problems of low safety, complex recovery process, and low recovery rate in the existing electrolyte recovery methods, the present invention provides a recovery method for the electrolyte of waste lithium-ion batteries, which aims to recover the electrolyte in a safe and green way. ingredients such as organic solvents

Method used

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  • Recovery method for electrolyte of waste lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Short-circuit discharge the collected 10 18650 waste lithium-ion batteries to 0V, then put them into a negative pressure (90kPa) space, and use a pulverizer to crush the batteries vigorously;

[0064] (2) Mix nitrogen and water vapor heated to 150°C and blow it to the broken battery at a speed of 1.5m / s, so that the organic solvent and lithium salt (LiPF 6 Decomposition) volatilization, with trace solids;

[0065] (3) Condensing the volatile matter (purged air flow) obtained in step (2) to obtain a solid-liquid mixture and gas (purged tail gas);

[0066] (4) filtering the solid-liquid mixture obtained in step (3) through a 1000 mesh screen to separate solid and liquid;

[0067] (5) Ca(OH) that the gas of step (3) gained and the solid of step (4) are passed into pH 10 2 Solution, the calcium fluoride precipitate is recovered to be 0.38g, and then combusted and discharged;

[0068] (6) Pass the liquid obtained in step (5) through anhydrous alumina to remove moistur...

Embodiment 2

[0070] Compared with Example 1, the difference is that the gas flow temperature in (2) is 180°C, the calcium fluoride precipitate is reclaimed in step (4) and increased to 0.53g, and the organic DEC and DMC are reclaimed in step (6) and increased to 10.1 g.

Embodiment 3

[0072] Compared with Example 1, the difference is that the gas flow temperature in (2) is 240°C, and the calcium fluoride precipitate is reclaimed in step (4) to 0.98g, and organic EC, DEC and DMC are reclaimed in step (6). to 18.2g.

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Abstract

The invention discloses a method for safe dismantling of a waste lithium ion battery and green recovery of an internal electrolyte. The method mainly comprises the steps of (1) performing short-circuit discharging on a waste battery; (2) performing dismantling and smashing on the battery in a negative pressure space; (3) blowing drying hot gas to battery fragments smashed in the negative pressure space to volatilize the electrolyte; and (4) performing condensing, filtering and alkali adding and fluorine removing on volatile components to obtain a relatively pure organic solvent, and performing innocent treatment on the residual gas and solid-state granules. According to the method, the battery is dismantled by the negative pressure environment, a contact area with the battery fragments can be enlarged by hot air flow, so that air flow with high stability is formed, the electrolyte solvent is recycled effectively and simply, and the advantage of low cost is realized; and meanwhile, the harmful substances in the electrolyte are subjected to the innocent treatment, so that environment friendliness and industrial recovery and utilization can be realized.

Description

technical field [0001] The invention belongs to the field of lithium ion battery recycling, and in particular relates to a method for safely dismantling waste lithium ion batteries and green recycling of electrolyte. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, they have become the main force in the field of portable power banks, and are widely used in the fields of mobile phones, notebooks, and electric bicycles. With the development of electric vehicles and electric buses advancing year by year, more large-scale mobile power sources will be needed in the future. However, most lithium-ion batteries are consumables, and it is expected that a large number of lithium-ion batteries will be scrapped in the next few years. Although these used lithium-ion batteries cannot continue to provide energy, the large amount of organic electrolyte inside the battery still has certain value, but most of them are adsorbed in the porous ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 赖延清张治安闫霄林方静洪波张凯李劼
Owner CENT SOUTH UNIV
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