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A method for microwave regeneration of positive electrode material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in the field of lithium-ion battery positive electrode materials using microwaves, can solve problems such as the inability to restore the structure of the recycled positive electrode materials, the inability to achieve complete recovery, and the structural defects of the positive electrode materials, so as to achieve effective recovery and suppression Li-nickel mixed row, the effect of reducing energy consumption

Active Publication Date: 2022-07-12
CALB CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the direct regeneration methods of lithium-ion batteries are mostly limited to the high-temperature solid-phase method, which needs to be carried out at a relatively high temperature, and the energy loss is large, and for some recovered positive electrode materials with serious structural damage, the structure cannot be restored by high temperature, resulting in Structural defects cannot achieve full recovery

Method used

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  • A method for microwave regeneration of positive electrode material of lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] LiNi 0.56 Co 0.12 Mn 0.32 O 2 (N562 for short) The ternary positive electrode sheet is broken and sent to the NMP ultrasonic cell. After ultrasonication at 50 °C for 20 minutes, the current collector aluminum foil is filtered out with a 300-mesh screen, and then the ultrasonic cell solution is poured into the ceramic filter plate filter and collected. The positive black powder obtained by filtration. Wash with absolute ethanol and dry to obtain the recovered ternary positive electrode material after purification and impurity removal.

[0044] The purified ternary cathode material obtained above and the LiOH lithium source were mixed uniformly, the Li / TM was adjusted to 1.02, and the lithium supplementation was carried out directly under the condition of pure oxygen, the microwave frequency was 28GHz, and the microwave treatment time was 2h.

Embodiment 2

[0046] LiNi 0.56 Co 0.12 Mn 0.32 O 2 (N562 for short) The ternary positive electrode sheet is broken and sent to the NMP ultrasonic cell. After ultrasonication at 50 °C for 20 minutes, the current collector aluminum foil is filtered out with a 300-mesh screen, and then the ultrasonic cell solution is poured into the ceramic filter plate filter and collected. The positive black powder obtained by filtration. Then use high (3mol / L), medium (1mol / L) and low (0.2mol / L) NaOH lye solutions to wash and filter in stages to obtain ternary cathode black powder, and finally wash with absolute ethanol and After drying, the recovered ternary positive electrode material after purification and impurity removal is obtained.

[0047] The purified ternary cathode material obtained above and the LiOH lithium source were mixed uniformly, the Li / TM was adjusted to 1.02, and the lithium supplementation was carried out directly under the condition of pure oxygen, the microwave frequency was 28GH...

Embodiment 3

[0049] LiNi 0.56 Co 0.12 Mn 0.32 O 2 (N562 for short) The ternary cathode sheet is crushed and placed in a high-temperature box furnace, heat-treated at 500 °C for 5 hours, and the cathode black powder is obtained by vibrating screening. The ternary cathode black powder was washed with three concentrations of lye of high (3mol / L), medium (1mol / L) and low (0.2mol / L) in turn to wash the ternary cathode material, and finally washed and dried with absolute ethanol. , that is, the purified ternary cathode material is obtained.

[0050] The purified ternary cathode material was mixed with LiOH uniformly, the Li / TM ratio was adjusted to 1.02, the lithium was directly supplemented by microwave under oxygen-containing conditions, the microwave frequency was controlled to 28GHZ, and the microwave treatment time was 2h.

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Abstract

Disclosed is a method for regenerating a positive electrode material of a lithium ion battery by microwave. The amount of 1.1, the lithium ion battery positive electrode material obtained from step (1) is fully mixed with the solid-state lithium source, and then the mixture is microwaved in air or pure oxygen atmosphere, in the formula Li / TM, Li is the solid state. The number of moles of Li in the lithium source, TM is the sum of the number of moles of each metal element in the positive electrode material of the lithium ion battery obtained from step (1). Through microwave treatment, not only can the energy consumption be reduced, the lithium supplement of the positive electrode material can be realized, but also the supplemented lithium can reach the inside of the positive electrode material to achieve higher capacity recovery, and at the same time, the structure of the positive electrode material can be recovered.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, and in particular, the invention relates to a method for regenerating positive electrode materials of lithium ion batteries using microwaves. Background technique [0002] With the continuous development of the new energy industry and the wide application of lithium-ion batteries, the number of retired batteries will also usher in an explosive growth. In order to reduce the cost of comprehensive recovery of positive and negative materials of lithium ion batteries, and to achieve the purpose of resource reuse and environmental protection, research on the recovery and regeneration of positive and negative materials has become increasingly urgent and important. [0003] As far as the positive electrode material of lithium-ion battery is concerned, after a long-term charge-discharge cycle, some lithium will remain in the negative electrode and cannot be deintercalated, resulting in the lack of li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M10/54
CPCH01M4/505H01M4/525H01M10/0525H01M10/54H01M2004/028Y02W30/84
Inventor 徐佳丽彭祖铃
Owner CALB CO LTD
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