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Method for regenerating positive electrode material of lithium ion battery by microwaves

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 recovered 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: 2022-04-29
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • Method for regenerating positive electrode material of lithium ion battery by microwaves

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Will LiNi 0.56 co 0.12 mn 0.32 o 2 (N562 for short) After the ternary positive electrode is crushed, it is sent into the NMP ultrasonic pool. After ultrasonication at 50°C for 20 minutes, the aluminum foil of the current collector is filtered out with a 300-mesh screen, and then the ultrasonic pool solution is poured into a ceramic filter plate filter, and collected Filter the obtained positive electrode black powder. Washing with absolute ethanol and drying to obtain the recovered ternary cathode material after purification and removal of impurities.

[0044] The purified and impurity-removed ternary cathode material obtained above was mixed evenly with the LiOH lithium source, and the Li / TM was adjusted to 1.02. Under the condition of pure oxygen, microwave lithium was directly replenished. The microwave frequency was 28GHz, and the microwave treatment time was 2h.

Embodiment 2

[0046] Will LiNi 0.56 co 0.12 mn 0.32 o 2 (N562 for short) After the ternary positive electrode is crushed, it is sent into the NMP ultrasonic pool. After ultrasonication at 50°C for 20 minutes, the aluminum foil of the current collector is filtered out with a 300-mesh screen, and then the ultrasonic pool solution is poured into a ceramic filter plate filter, and collected Filter the obtained positive electrode black powder. Then use high (3mol / L), medium (1mol / L), low (0.2mol / L) NaOH lye of three concentrations to wash and filter in stages to obtain ternary positive electrode black powder, and finally wash with absolute ethanol and dry After drying, the recovered ternary positive electrode material after purification and removal of impurities is obtained.

[0047] The purified and impurity-removed ternary cathode material obtained above was mixed evenly with the LiOH lithium source, and the Li / TM was adjusted to 1.02. Under the condition of pure oxygen, microwave lithium ...

Embodiment 3

[0049] Will LiNi 0.56 co 0.12 mn 0.32 o 2 (N562 for short) After the ternary positive electrode sheet is crushed, put it in a high-temperature box furnace, heat-treat at 500°C for 5 hours, and use vibration screening to obtain positive electrode black powder. The ternary positive electrode black powder is sequentially washed with high (3mol / L), medium (1mol / L) and low (0.2mol / L) alkali solutions in three stages to wash the ternary positive electrode material, and finally washed and dried with absolute ethanol , that is, the purified ternary cathode material is obtained.

[0050] Mix the purified ternary cathode material with LiOH evenly, adjust Li / TM to 1.02, and directly supplement lithium with microwave under oxygen-containing conditions. The microwave frequency is controlled at 28GHZ, and the microwave treatment time is 2h.

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Abstract

The method comprises the following steps: (1) collecting a lithium ion battery positive pole piece and separating out a current collector to obtain the lithium ion battery positive pole material; and (2) the lithium ion battery positive electrode material obtained in the step (1) is fully mixed with a solid-state lithium source according to the lithium matching amount Li / TM of 1-1.1, then the mixture is subjected to microwave treatment in the air or pure oxygen atmosphere, in the formula Li / TM, Li is the mole number of Li in the solid-state lithium source, and TM is the sum of the mole numbers of metal elements in the lithium ion battery positive electrode material obtained in the step (1). Through microwave treatment, the energy consumption can be reduced, lithium supplementation of the positive electrode material is realized, the supplemented lithium can reach the inside of the positive electrode material, higher capacity recovery is realized, and meanwhile, the structure of the positive electrode material is recovered.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular, the invention relates to a method for regenerating lithium ion battery cathode materials by 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 decommissioned batteries will also usher in explosive growth. In order to reduce the cost of comprehensive recycling of positive and negative electrode materials of lithium-ion batteries and achieve the purpose of resource reuse and environmental protection, it is becoming increasingly urgent and important to carry out research on the recovery and regeneration of positive and negative electrode materials. [0003] As far as the positive electrode material of lithium-ion batteries is concerned, after long-term charge-discharge cycles, some lithium will remain in the negative electrode and cannot be deintercalated, resul...

Claims

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Application Information

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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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