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Carbon dioxide subcritical extraction and recycling method of waste lithium-ion battery electrolyte

A lithium-ion battery, carbon dioxide technology, applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve the problems of secondary pollution solvents, separation, etc., achieve high resource utilization, avoid pollution, and save post-processing program effect

Active Publication Date: 2018-10-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the secondary pollution and solvent separation problems of traditional organic dissolution extraction, the present invention proposes a carbon dioxide subcritical extraction recovery and reuse method for the electrolyte of waste lithium-ion batteries

Method used

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  • Carbon dioxide subcritical extraction and recycling method of waste lithium-ion battery electrolyte
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  • Carbon dioxide subcritical extraction and recycling method of waste lithium-ion battery electrolyte

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specific Embodiment approach 1

[0014] Specific implementation mode 1. Combination figure 1 Describe this specific embodiment, the carbon dioxide subcritical extraction recycling method of the waste lithium-ion battery electrolyte described in this specific embodiment is realized by the following steps:

[0015] Step 1. Disassemble the used lithium-ion battery after fully discharging, and remove the shell, positive and negative terminals, sealing ring and cover plate;

[0016] Step 2. Transfer the electrolyte, current collectors with positive and negative materials, and diaphragms into a supercritical extraction device;

[0017] Step 3, adjusting the temperature, pressure, extraction time and flow rate of the supercritical carbon dioxide fluid, and then extracting the organic solvent and additives;

[0018] Step 4: Analyze the components of the obtained solvent, supplement electrolyte salt, organic solvent and additives according to the analysis results, and adjust the ratio to prepare electrolytes with dif...

specific Embodiment approach 2

[0020] Embodiment 2. The difference between this embodiment and the carbon dioxide subcritical extraction and recycling method of a waste lithium-ion battery electrolyte described in Embodiment 1 is that the waste lithium-ion battery described in step 1 is a buckle One or a combination of formula batteries, cylindrical batteries, square batteries or power batteries.

specific Embodiment approach 3

[0021] Embodiment 3. The difference between this embodiment and the carbon dioxide subcritical extraction and recycling method of a waste lithium-ion battery electrolyte described in Embodiment 1 is that the waste lithium-ion battery described in step 1 is fully The discharge method is one or a combination of liquid nitrogen freezing method, graphite powder short circuit method or charging and discharging motor discharge method.

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Abstract

The invention provides a carbon dioxide subcritical extraction, recycling and reusing method for the electrolyte of a waste lithium ion battery, belonging to the field of recycling and reusing of solid waste. The method comprises the following steps: after complete discharging of the waste lithium ion battery, dismounting the waste lithium ion battery and removing a shell, positive and negative terminals, sealing rings and cover plates; transferring the electrolyte, current collectors with positive and negative electrode materials and a diaphragm into a supercritical extraction apparatus; adjusting the temperature, pressure, extraction time and flow of a supercritical carbon dioxide fluid and extracting an organic solvent and an additive; and subjecting the obtained solvent to component analysis, supplementing electrolyte salt, the organic solvent and the additive according to analysis results and adjusting a ratio to prepare electrolytes with different functions. The method effectively prevents degradation and dissipation of heat-sensitive substances; operation parameters are easy to control; extraction, separation and recovery are integrated together; later complicated treating procedures are omitted; and the utilization rate of resources is higher.

Description

technical field [0001] The invention relates to the field of recycling and reuse of solid waste, in particular to the field of recycling and reuse of electrolyte solution of waste lithium-ion batteries. Background technique [0002] The application of lithium-ion batteries in consumer electronics and electric vehicles has experienced leapfrog development. In the 10 years from 2000 to 2010, the annual output of lithium-ion batteries increased at a rate of 800%. It is estimated that by 2020, there will be more than 25 billion waste lithium-ion batteries, totaling about 500,000 tons. Lithium-ion batteries will be discarded at the end of their life cycle. If there is no relevant policy or effective treatment technology, it is foreseeable that the world will face the dilemma of changing from an electronic paradise to an electronic hell. The recycling of lithium-ion batteries not only reduces energy consumption, but also alleviates the pressure of shortage of rare resources, elim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 戴长松穆德颖刘元龙
Owner HARBIN INST OF TECH
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