A method for low-temperature integrated recycle of waste lithium ion batteries

A lithium-ion battery, low-temperature technology, applied in the field of lithium-ion batteries, can solve the problems of incompatibility between dissociation degree and over-grinding, easy over-grinding when crushed at room temperature, poisonous and harmful gases in the electrolyte, etc., to achieve easy implementation, good product quality, The effect of good social and economic benefits

Inactive Publication Date: 2018-12-04
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the normal temperature crushing method is widely used, but the normal temperature crushing is easy to over-grinding, and the degree of dissociation and over-grinding are a contradiction that cannot be considered at the same time.
In addition, the crushing process will increase the temperature of the material and cause side reactions, which is not conducive to subsequent recovery, and will cause the volatilization of the electrolyte to produce toxic and harmful gases, forming secondary pollution
However, the treatment cost of chemical method is high, and it is also easy to form secondary pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for comprehensively recycling waste lithium-ion batteries at low temperature, comprising the following steps:

[0026] (1) Battery pretreatment: soak the waste lithium-ion battery to be recovered in 5wt% sodium chloride aqueous solution for 48 hours to discharge, and air-dry to avoid battery short circuit during the crushing process;

[0027] (2) Battery pre-freezing: put the pretreated waste lithium-ion batteries into the crushing chamber of the freezer, and use liquid nitrogen to pre-freeze the lithium-ion batteries at a temperature of -80°C and a pre-freezing time of 3 minutes;

[0028] (3) Frozen coarse crushing: The pre-frozen lithium-ion battery is sheared and coarsely crushed at a temperature of -80°C and the coarse crushing time is 15s, and the particle size of the crushed sample is controlled to be <2cm;

[0029] (4) Frozen and finely crushed: shock and finely crush the coarsely crushed lithium-ion battery at a temperature of -80°C, and the crushing ti...

Embodiment 2

[0032] A method for comprehensively recycling waste lithium-ion batteries at low temperature, comprising the following steps:

[0033] (1) Battery pretreatment: soak the waste lithium-ion battery to be recovered in 10wt% sodium chloride aqueous solution for 48 hours to discharge, and air-dry to avoid battery short circuit during the crushing process;

[0034] (2) Battery pre-freezing: put the pretreated waste lithium-ion battery into the crushing chamber of the freezer, and use liquid helium to pre-freeze the lithium-ion battery at a temperature of -150°C and a pre-freezing time of 5 minutes;

[0035] (3) Frozen coarse crushing: the pre-frozen lithium-ion battery is sheared and coarsely crushed at a temperature of -150°C, the crushing time is 15s, and the particle size of the crushed sample is controlled to be <2cm;

[0036] (4) Frozen and finely crushed: Shock and finely crush the coarsely crushed lithium-ion battery at a temperature of -150°C, and the crushing time is 20-30s...

Embodiment 3

[0039] A method for comprehensively recycling waste lithium-ion batteries at low temperature, comprising the following steps:

[0040] (1) Battery pretreatment: soak the waste lithium-ion battery to be recovered in 5wt% sodium chloride aqueous solution for 48 hours to discharge, and air-dry to avoid battery short circuit during the crushing process;

[0041] (2) Battery pre-freezing: put the pretreated waste lithium-ion battery into the crushing chamber of the freezer, and use liquid nitrogen to pre-freeze the lithium-ion battery at a temperature of -180°C, and the pre-freezing time is 5 minutes;

[0042] (3) Frozen coarse crushing: The pre-frozen lithium-ion battery is sheared and coarsely crushed at a temperature of -180°C and the crushing time is 15s, and the particle size of the crushed sample is controlled to be <2cm;

[0043] (4) Frozen and finely crushed: Shock and finely crush the coarsely crushed lithium-ion batteries at a temperature of -180°C, and the crushing time ...

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PUM

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Abstract

A method for low-temperature integrated recycle of waste lithium ion batteries is disclosed. The method includes (1) subjecting the waste lithium ion batteries to be recycled to discharging and air drying; (2) pre-freezing the pretreated batteries; (3) subjecting the pre-frozen batteries to freezing and cutting for coarse crushing; (4) subjecting the coarsely crushed batteries to freezing and impacting for fine crushing; and (5) sieving the sample after fine crushing, with an oversize product being battery shells and current collector materials and an undersize product being powder containingpositive and negative electrode materials. Through freeze crushing and sieving separation, electrode materials are efficiently separated from the shell material and current collector materials of thelithium ion batteries, low-temperature crushing does not generate heat accumulation so as to avoid the risk of explosion, and does not generate toxic or harmful gas so that the method is energy-saving, environmentally friendly and high in efficiency. Recovered products are good in quality, can be conveniently recycled, and have promotion value.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a method for recycling waste lithium-ion batteries, in particular to a method for comprehensively recycling waste lithium-ion batteries at low temperature. Background technique [0002] As a green and environmentally friendly new energy, lithium-ion batteries have the advantages of good reliability, high safety, small size, and light weight. At present, they have been widely used in digital products, electric vehicles, military products and other fields. With the country's strong support for new energy, the development of lithium-ion batteries is in full swing, and the demand for lithium-ion batteries is increasing. However, with the end of the service life of lithium-ion batteries, many discarded lithium-ion batteries need to be disposed of urgently. Improper disposal will cause serious environmental pollution and waste metal resources such as cobalt and nickel. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M10/0525
CPCH01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 王海锋刘江山何亚群王帅
Owner CHINA UNIV OF MINING & TECH
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