Rapid regeneration method of positive electrode material of waste ternary lithium ion battery

A lithium-ion battery and cathode material technology, applied in the field of rapid regeneration of waste ternary lithium-ion battery cathode materials, can solve problems such as unattractive economics, long processing cycle, complicated operation, etc., and achieve huge industrial application potential and operation Simple, cost-effective results

Pending Publication Date: 2020-11-24
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These traditional recycling methods are complex in operation, long in processing cycle and high in cost and are not economically attractive

Method used

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  • Rapid regeneration method of positive electrode material of waste ternary lithium ion battery
  • Rapid regeneration method of positive electrode material of waste ternary lithium ion battery
  • Rapid regeneration method of positive electrode material of waste ternary lithium ion battery

Examples

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Effect test

Embodiment 1

[0032] A method for oxidation repair and quick regeneration of a waste ternary lithium-ion battery positive electrode material, the specific steps are as follows:

[0033] (1) Replace the waste NCM622 (LiNi 0.6 co 0.2 mn 0.2 o 2 ) The ternary lithium-ion battery is deeply discharged in a sodium chloride solution with a concentration of 2mol / L, and the discharge time is 72h. The battery is manually disassembled, and the positive electrode, negative electrode copper foil, casing, diaphragm, etc. are separated;

[0034] (2) Clean the positive plate with dimethyl carbonate, then place it in NMP with a solid-to-liquid ratio of 100g / L, and add ultrasonic treatment for 30 minutes to obtain a suspension containing waste ternary powder;

[0035] (3) Put the suspension obtained in step (2) into a centrifuge tube and centrifuge at 1000rpm for 30min. After the centrifugation is completed, pour off the supernatant, and then perform centrifugation again, repeating 2 times;

[0036] (4) ...

Embodiment 2

[0043] A method for oxidation repair and quick regeneration of a waste ternary lithium-ion battery positive electrode material, the specific steps are as follows:

[0044] (1) Replace the waste NCM523 (LiNi 0.5 co 0.2 mn 0.3 o 2 ) The ternary lithium-ion battery is deeply discharged in a 3mol / L sodium chloride solution, and the discharge time is 24h. The battery is manually disassembled, and the positive electrode, negative electrode copper foil, shell, diaphragm, etc. are separated;

[0045](2) Clean the positive plate with dimethyl carbonate, then place it in NMP with a solid-to-liquid ratio of 100g / L, and add ultrasonic treatment for 20 minutes to obtain a suspension containing waste ternary powder;

[0046] (3) Put the suspension obtained in step (2) into a centrifuge tube and centrifuge at 1300 rpm for 25 minutes. After the centrifugation is completed, discard the supernatant, and then perform centrifugation again, repeating 3 times;

[0047] (4) Dry the centrifuged s...

Embodiment 3

[0055] A method for oxidation repair and quick regeneration of a waste ternary lithium-ion battery positive electrode material, the specific steps are as follows:

[0056] (1) Replace the used NCM811 (LiNi 0.8 co 0.1 mn 0.1 o 2 ) The ternary lithium-ion battery is deeply discharged in 1mol / L sodium chloride solution, and the discharge time is 60h. The battery is disassembled manually, and the positive electrode sheet, negative electrode copper foil, shell, diaphragm, etc. are separated;

[0057] (2) Clean the positive plate with dimethyl carbonate, then place it in NMP with a solid-to-liquid ratio of 100g / L, and add ultrasonic treatment for 40 minutes to obtain a suspension containing waste ternary powder;

[0058] (3) Put the suspension obtained in step (2) into a centrifuge tube and centrifuge at 1500rpm for 20min. After the centrifugation is completed, discard the supernatant, and then perform centrifugation again, repeating 2 times;

[0059] (4) Dry the centrifuged sus...

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Abstract

The invention discloses a rapid regeneration method of a positive electrode material of a waste ternary lithium ion battery. The rapid regeneration method comprises the following steps: manually disassembling the waste ternary lithium ion battery, cleaning with dimethyl carbonate, soaking with NMP, centrifuging, oxidizing, spray-drying, grinding and calcining to obtain waste ternary positive electrode material powder; a combined process of pre-oxidation treatment, spray drying and high-temperature short-time annealing is provided to regenerate the waste ternary positive electrode material; a rock salt phase on the surface of the waste ternary lithium ion battery positive electrode material is oxidized, alkali is added to generate a layered intermediate phase, lithium mixing and grinding are performed, and short-time high-temperature annealing treatment is performed, so that the intermediate phase can form a layered oxide phase to repair a failed surface; meanwhile, lithium lost in thecirculation process can be supplemented, so that the positive electrode material is regenerated; and the method provided by the invention can realize rapid repair and regeneration of the waste ternarypositive electrode material, has the characteristics of simple operation, high efficiency and economical efficiency and no pollution, and provides a new idea for recovery and regeneration of the ternary positive electrode material of the waste lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of recycling waste lithium ion batteries and circular economy, in particular to a rapid regeneration method for positive electrode materials of waste ternary lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices such as mobile phones, notebook computers, cameras, and electric vehicles because of their high capacity, light weight, long life, and no memory. With the development of these electronic devices, the demand for lithium-ion batteries is increasing day by day. Since the life of lithium-ion batteries is only 3-5 years, a large number of waste lithium-ion batteries will be generated in the near future. Waste lithium-ion batteries contain Cu, Ni, Co and other heavy metals and LiPF 6 , EC and other compounds will cause great harm to the environment and human health. At the same time, Ni, Co, Mn, and Li in lithium-ion batteries are all v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M10/54
CPCC01G53/006H01M10/54C01P2002/72C01P2004/03C01P2004/32C01P2004/61C01P2006/40Y02W30/84
Inventor 董鹏杨轩孟奇张英杰李清湘周少强李雪刘银陈端云
Owner KUNMING UNIV OF SCI & TECH
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