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A kind of method adopting red mud to separate waste lithium battery cathode material and aluminum foil

A cathode material, lithium battery technology, applied in battery recycling, recycling technology, waste collector recycling, etc., can solve problems such as equipment corrosion and environmental pollution, and achieve the effect of reducing anti-corrosion costs, reducing air pollution, and preventing corrosion

Active Publication Date: 2021-03-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation principle is that the organic binder polyvinylidene fluoride in the positive pole piece undergoes a thermal decomposition reaction under high temperature conditions. The red mud can not only promote the decomposition of polyvinylidene fluoride through the action of flux, but also absorb polyvinylidene fluoride. The fluoride released by the thermal decomposition of vinyl fluoride can effectively solve the problem of equipment corrosion and environmental pollution caused by the high-temperature separation of aluminum foil and positive electrode material powder in the positive electrode sheet of waste lithium batteries and the fluoride released by the thermal decomposition of polyvinylidene fluoride compared with the existing technology question

Method used

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  • A kind of method adopting red mud to separate waste lithium battery cathode material and aluminum foil
  • A kind of method adopting red mud to separate waste lithium battery cathode material and aluminum foil

Examples

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Effect test

Embodiment 1

[0030] Firstly, the collected waste ternary lithium batteries were intensively charged and discharged in sodium chloride solution to prevent possible explosive reactions during manual disassembly. Then use tools to break the metal shell of the discarded lithium battery, and manually disassemble to obtain the positive pole piece, negative pole piece, separator and metal shell. Dry the positive pole piece in an oven at 80 degrees as a spare raw material for the next step.

[0031] Mix the red mud powder and the obtained positive pole piece uniformly at a mass ratio of 2:1 and put them into a quartz boat, place the quartz boat in a tube furnace for a thermal reaction at 300 degrees for 30 minutes, and decompose the organic adhesive in the positive pole piece. binder polyvinylidene fluoride. After the reaction is completed, the tube furnace is naturally cooled down. After the temperature is lowered to room temperature, the positive electrode piece is taken out from the reaction m...

Embodiment 2

[0035] Firstly, the collected waste ternary lithium batteries were intensively charged and discharged in sodium chloride solution to prevent possible explosive reactions during manual disassembly. Then use tools to break the metal shell of the discarded lithium battery, and manually disassemble to obtain the positive pole piece, negative pole piece, separator and metal shell. Dry the positive pole piece in an oven at 80 degrees as a spare raw material for the next step. Mix the red mud powder and the positive electrode piece of the waste lithium battery evenly at a mass ratio of 1:1 and put it into a quartz boat, place the quartz boat in a tube furnace for a thermal reaction at 350 degrees for 30 minutes, and decompose the positive electrode piece Organic binder polyvinylidene fluoride. After the reaction is completed, the tube furnace is naturally cooled down. After the temperature is lowered to room temperature, the positive electrode piece is taken out from the reaction me...

Embodiment 3

[0037] Firstly, the collected waste ternary lithium batteries were intensively charged and discharged in sodium chloride solution to prevent possible explosive reactions during manual disassembly. Then use tools to break the metal shell of the discarded lithium battery, and manually disassemble to obtain the positive pole piece, negative pole piece, separator and metal shell. Dry the positive pole piece in an oven at 80 degrees as a spare raw material for the next step. Mix the red mud powder and the positive pole piece of the waste lithium battery evenly at a mass ratio of 3:1 and put them into a quartz boat, put the quartz boat in a tube furnace for a thermal reaction at 300 degrees for 20 minutes, and decompose the positive pole piece Organic binder polyvinylidene fluoride. After the reaction is completed, the tube furnace is naturally cooled down. After the temperature is lowered to room temperature, the positive electrode piece is taken out from the reaction medium red m...

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Abstract

The invention discloses a method of using red mud as a reaction medium to separate the positive electrode material and aluminum foil of a waste lithium battery. The method can realize the separation of the positive electrode material and aluminum foil in the positive pole piece of a waste lithium battery by using red mud as a high temperature reaction medium. Mud, as an in-situ reaction reagent, promoted the adsorption of fluoride produced by the high-temperature thermal decomposition and decomposition of the organic binder polyvinylidene fluoride in the positive electrode sheet of the spent lithium battery. Compared with the prior art, the method of the present invention uses red mud as the reaction medium to separate the positive electrode material and aluminum foil of the waste lithium battery. Flux can solve the problem of industrial solid waste stacking, and can also realize the reduction, recycling and harmlessness of industrial solid waste. The peeling rate of red mud on the aluminum foil and positive electrode material of the positive electrode sheet of the waste lithium battery is as high as 97.0 wt%.

Description

technical field [0001] The invention belongs to the technical field of industrial solid waste and electronic waste treatment and recycling, and more specifically relates to a method of using red mud as a reaction medium to separate the positive electrode material and aluminum foil of a waste lithium battery. The high-temperature reaction medium realizes the separation of the positive electrode material and the aluminum foil in the positive pole piece of the waste lithium battery. Adsorption of fluoride. Background technique [0002] With the increasing shortage of global fossil resources and the urgent need to deal with greenhouse gas emissions, the development of new energy electric vehicles to reduce the consumption of fossil resources and reduce environmental pollution is gradually becoming a broad social consensus. In 2017, global sales of electric vehicles reached 1.09 million, a year-on-year increase of 57%. However, corresponding to the thriving new energy vehicle m...

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 李金惠刘康刘丽丽谭全银
Owner TSINGHUA UNIV
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