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A method for in-situ adsorption of fluoride in waste lithium batteries using high-speed iron slag

A lithium battery and fluoride technology, which is applied in the field of industrial solid waste treatment and recycling, can solve problems such as air pollution, and achieve the effects of preventing air pollution, achieving reduction, and achieving significant economy.

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

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention realizes the adsorption of the fluoride released during the high-temperature thermal decomposition process of the organic binder polyvinylidene fluoride in the positive pole piece of the waste lithium battery by using high-speed iron slag as the in-situ adsorbent Compared with the existing technology, it can effectively solve the problem of air pollution caused by the fluoride released by the thermal decomposition of polyvinylidene fluoride in the positive pole piece of the waste lithium battery during the fire recycling process

Method used

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  • A method for in-situ adsorption of fluoride in waste lithium batteries using high-speed iron slag
  • A method for in-situ adsorption of fluoride in waste lithium batteries using high-speed iron slag

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Embodiment 1

[0029] Discarded lithium batteries were discharged in sodium chloride solution to avoid spontaneous combustion reactions during disassembly. Then the waste lithium battery is disassembled, and the positive pole piece, negative pole piece, separator and metal shell are obtained through separation, and the positive pole piece is dried for later use.

[0030] The high-speed iron slag was mixed with the positive electrode sheet of the obtained waste lithium battery at a mass ratio of 2:1, and the heating reaction was carried out in a tube furnace to decompose the organic binder in the positive electrode sheet. The reaction temperature is set to 300 degrees, the reaction time is set to 10 minutes, the heating rate is 10 degrees / min, and the temperature is naturally cooled after reaching the predetermined temperature. After cooling down to room temperature, take out the positive electrode piece after heating and reacting in the tube furnace from the high-speed iron slag, rinse the r...

Embodiment 2

[0034] Discarded lithium batteries were discharged in sodium chloride solution to avoid spontaneous combustion reactions during disassembly. Then the waste lithium battery is disassembled, and the positive pole piece, negative pole piece, separator and metal shell are obtained through separation, and the positive pole piece is dried for later use.

[0035] The high-speed iron slag was mixed with the positive pole piece of the obtained waste lithium battery at a mass ratio of 2:1, and the heating reaction was carried out in a tube furnace to decompose the organic binder in the positive pole piece. The reaction temperature is set to 400 degrees, the reaction time is set to 10 minutes, the heating rate is 10 degrees / min, and the temperature is naturally cooled after reaching the predetermined temperature. After cooling down to room temperature, take out the positive pole piece after heating and reacting in the tube furnace from the high-speed iron slag, rinse the residue on the s...

Embodiment 3

[0037] Discarded lithium batteries were discharged in sodium chloride solution to avoid spontaneous combustion reactions during disassembly. Then the waste lithium battery is disassembled, and the positive pole piece, negative pole piece, separator and metal shell are obtained through separation, and the positive pole piece is dried for later use.

[0038] The high-speed iron slag was mixed with the positive electrode sheet of the obtained waste lithium battery at a mass ratio of 3:1, and the heating reaction was carried out in a tube furnace to decompose the organic binder in the positive electrode sheet. The reaction temperature is set to 300 degrees, the reaction time is set to 20 minutes, the heating rate is 10 degrees / min, and the temperature is naturally cooled after reaching the predetermined temperature. After cooling down to room temperature, take out the positive pole piece after heating and reacting in the tube furnace from the high-speed iron slag, rinse the residu...

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Abstract

The invention discloses a method for in-situ adsorption of fluoride in waste lithium batteries by using high-iron slag. The method can realize the high temperature of the organic binder polyvinylidene fluoride in the positive pole piece of the waste lithium battery by using high-iron slag as the in-situ adsorbent. Adsorption of fluoride released during thermal decomposition. Compared with the existing technology, the method of in-situ adsorption of fluoride in waste lithium batteries by using high-speed iron slag can not only convert industrial solid waste into functional materials capable of in-situ adsorption of fluoride, but also solve the problem of industrial solid waste stacking. The reduction, recycling and harmlessness of industrial solid waste can be realized, and the in-situ adsorption rate of high-speed iron slag to fluorine in polyvinylidene fluoride is as high as 99.0 wt%.

Description

technical field [0001] The invention belongs to the technical field of industrial solid waste treatment and recycling, and more specifically relates to a method for in-situ adsorption of fluoride in waste lithium batteries by using high-iron slag. Adsorption of fluoride released during high-temperature thermal decomposition of organic binder polyvinylidene fluoride in the positive electrode sheet of lithium batteries. Background technique [0002] The prosperity and development of the new energy electric vehicle industry has led to the continuous reduction of the production cost of lithium-ion batteries and the continuous increase of production volume. The current global annual production of lithium-ion batteries with an average lifespan of only 2-3 years has reached more than 1 billion, which has become an unavoidable problem for ecological environmental protection and sustainable development of human society. Multiple valuable metals such as copper, aluminum, cobalt, nick...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54B01D53/02
CPCB01D53/02B01D2253/10B01D2257/2047H01M10/54Y02W30/84
Inventor 李金惠刘康刘丽丽谭全银
Owner TSINGHUA UNIV