Method for recovering electrolyte in waste lithium ion battery

A lithium-ion battery and recycling method technology, which is applied in the field of recycling and processing waste lithium-ion battery electrolyte, can solve problems such as air pollution, fluorine does not meet environmental protection standards, and high operating costs, and achieves the effect of improving separation rate and efficient recycling

Inactive Publication Date: 2019-12-03
XINZHONGTIAN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Patent CN103825065B adopts low-temperature freezing method to eliminate the harm of electrolyte, but low-temperature freezing method has high energy consumption and high operating cost
The above existing methods do not recycle the electrolyte, and the treatment of fluorine does not meet the environmental protection standards, and the discharged gas still pollutes the atmosphere.

Method used

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  • Method for recovering electrolyte in waste lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Recycling and processing of electrolyte in the waste lithium-ion battery of embodiment 1

[0029] process such as figure 1 shown.

[0030] The specific process is as follows:

[0031] 1. Disassemble the discharged waste lithium-ion single cells by mechanical means, destroy the internal structure of the battery, facilitate transportation, improve processing efficiency, and avoid risks. Single cells include pouch batteries, cylindrical batteries, and square batteries.

[0032] 2. The disassembled cell material is subjected to thermal cracking treatment, which can effectively solve the pollution of electrolyte and binder. Electrolyte LiPF in the electrolyte 6 It is converted into fluoride and phosphide, and the solvent is vaporized; the binder is carbonized into amorphous carbon to fail, and the separation rate of the electrode material and the current collector is improved. The pyrolysis temperature is 400°C, the pyrolysis time is about 1.0h, and the pyrolysis proces...

Embodiment 2

[0037] Embodiment 2 Recycling and processing of electrolyte in waste lithium-ion batteries

[0038] process such as figure 1 shown.

[0039] The specific process is as follows:

[0040] 1. Disassemble the discharged waste lithium-ion single cells by mechanical means, destroy the internal structure of the battery, facilitate transportation, improve processing efficiency, and avoid risks. Single cells include pouch batteries, cylindrical batteries, and square batteries.

[0041] 2. The disassembled cell material is subjected to thermal cracking treatment, which can effectively solve the pollution of electrolyte and binder. Electrolyte LiPF in the electrolyte 6 It is converted into fluoride and phosphide, and the solvent is vaporized; the binder is carbonized into amorphous carbon to fail, and the separation rate of the electrode material and the current collector is improved. The pyrolysis temperature is 300°C, and the pyrolysis time is about 1.5h. Pass inert gas protectio...

Embodiment 3

[0045] Embodiment 3 Recycling of Electrolyte in Waste Lithium-ion Batteries

[0046] process such as figure 1 shown.

[0047] The specific process is as follows:

[0048] 1. Disassemble the discharged waste lithium-ion single cells by mechanical means, destroy the internal structure of the battery, facilitate transportation, improve processing efficiency, and avoid risks. Single cells include pouch batteries, cylindrical batteries, and square batteries.

[0049] 2. The disassembled cell material is subjected to thermal cracking treatment, which can effectively solve the pollution of electrolyte and binder. Electrolyte LiPF in the electrolyte 6 It is converted into fluoride and phosphide, and the solvent is vaporized; the binder is carbonized into amorphous carbon to fail, and the separation rate of the electrode material and the current collector is improved. The pyrolysis temperature is about 500°C, the pyrolysis time is about 0.5, and the pyrolysis process is protected ...

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Abstract

The invention discloses a method for recovering an electrolyte in a waste lithium ion battery. The method comprises the steps that the single cell of the waste lithium ion battery after discharging isdisassembled; thermal cracking treatment is carried out at 300 to 500 DEG C, wherein the pyrolysis time is 0.5 to 1.5h; the solid material after thermal cracking is pulverized, sorted and recovered to acquire an electrode material, iron, aluminum and copper powder; the thermally cracked gas is first dedusted and then condensed to recover the condensed electrolyte; and the condensed gas is discharged after being leached with an alkaline solution. According to the method provided by the invention, the electrolyte is recovered, and the fluorine content of the discharged gas is reduced to below the emission standard to meet the requirement of environmental protection treatment.

Description

technical field [0001] The invention belongs to the technical field of recycling waste lithium-ion batteries, and in particular relates to a method for recycling and treating electrolytes of waste lithium-ion batteries. Background technique [0002] With the rapid development of new energy electric vehicles, the output of automotive power lithium batteries will increase significantly. Lithium batteries contain various recyclable materials. An electric vehicle uses an average of 50 kg of positive electrode materials, 40 kg of negative electrode materials, and 40 kg of electrolyte. In 2018, 5,000 tons of positive electrode materials, 4,000 tons of negative electrode materials, and 4,000 tons of electrolyte will be produced. If 2 million lithium battery electric vehicles are invested in 2020, 100,000 tons of positive electrodes, 80,000 tons of negative electrodes, and 80,000 tons of electrolyte will be produced in 2025-2027, and the industrial scale will exceed 35 billion yuan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54B09B3/00B09B5/00
CPCH01M10/54B09B3/00B09B5/00B09B3/40Y02W30/20Y02W30/84
Inventor 令狐磊左姣刘科强毛小英赵静何睿鸣
Owner XINZHONGTIAN ENVIRONMENTAL PROTECTION
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