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A hydrothermal lithium supplementation-spray remodeling regeneration method for waste ternary cathode materials

A technology for positive electrode materials and ternary lithium batteries, which is applied in the direction of electrical components, battery electrodes, electrochemical generators, etc., can solve the problems of long process flow of ternary positive electrode materials, increase the difficulty of waste liquid treatment, and complicated process flow, and achieve good results. Electrochemical performance, realization of direct regeneration and high-value utilization, and simple operation of the method

Active Publication Date: 2021-03-30
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, the product recovered by the precipitation separation method has high purity, but the process is relatively complicated, and there are many control parameters. At the same time, various harmful gases will be produced, which will cause secondary pollution; the co-precipitation method recovers and prepares the ternary cathode material process It is long, and it is easy to produce more waste liquid at the same time, so it increases the difficulty of waste liquid treatment, and at the same time, due to the leaching of inorganic acids, a large amount of toxic gas (Cl 2 , SO 2 , NO 2 ) and a large amount of acidic waste liquid will cause secondary pollution

Method used

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  • A hydrothermal lithium supplementation-spray remodeling regeneration method for waste ternary cathode materials
  • A hydrothermal lithium supplementation-spray remodeling regeneration method for waste ternary cathode materials
  • A hydrothermal lithium supplementation-spray remodeling regeneration method for waste ternary cathode materials

Examples

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Effect test

Embodiment 1

[0035] A hydrothermal lithium supplementation-spray remodeling regeneration method for waste ternary positive electrode materials, the specific steps are as follows:

[0036] (1) Replace the waste NCM622 (LiNi 0.6 co 0.2 mn 0.22 o 2 ) The ternary lithium battery is placed in a sodium chloride solution with a concentration of 2mol / L, placed for 36 hours, deeply discharged, and the battery is manually disassembled to separate the positive aluminum foil, negative copper foil, shell, diaphragm, tabs, etc.;

[0037] (2) Put the positive electrode aluminum foil in a sodium hydroxide solution with a concentration of 1mol / L, then peel off the positive electrode material, and wash the peeled positive electrode material with a sodium hydroxide solution with a concentration of 1mol / L;

[0038] (3) Put the waste ternary lithium battery positive electrode material obtained in step (2) into a drying oven at 120°C and dry for 12 hours; then put it into a box furnace for calcination at 650...

Embodiment 2

[0047] A hydrothermal lithium supplementation-spray remodeling regeneration method for waste ternary positive electrode materials, the specific steps are as follows:

[0048] (1) Replace the used NCM523 (LiNi 0.5 co 0.2 mn 0.3 o 2 ) The ternary lithium battery is placed in a sodium chloride solution with a concentration of 2mol / L, placed for 36 hours, deeply discharged, and the battery is manually disassembled to separate the positive aluminum foil, negative copper foil, shell, diaphragm, tabs, etc.;

[0049] (2) Put the positive electrode aluminum foil in a sodium hydroxide solution with a concentration of 2mol / L, then peel off the positive electrode material, and wash the peeled positive electrode material with a sodium hydroxide solution with a concentration of 2mol / L;

[0050] (3) Put the waste ternary lithium battery positive electrode material obtained in step (2) into a drying oven at 150°C and dry for 10 hours; then put it into a box furnace for calcination at 600°C...

Embodiment 3

[0059] A hydrothermal lithium supplementation-spray remodeling regeneration technology for waste ternary cathode materials, the specific steps are as follows:

[0060] (1) Replace the used NCM811 (LiNi 0.8 co 0.1 mn 0.1 o 2 ) The ternary lithium battery is placed in a sodium chloride solution with a concentration of 2mol / L, placed for 36 hours, deeply discharged, and the battery is manually disassembled to separate the positive aluminum foil, negative copper foil, shell, diaphragm, tabs, etc.;

[0061] (2) Put the positive electrode aluminum foil in a sodium hydroxide solution with a concentration of 1.5mol / L, then peel off the positive electrode material, and wash the peeled positive electrode material with a sodium hydroxide solution with a concentration of 1.5mol / L;

[0062] (3) Put the waste ternary lithium battery positive electrode material obtained in step (2) into a drying oven at 135°C and dry for 16 hours; then put it into a box furnace for calcination at 700°C fo...

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Abstract

The invention discloses a hydrothermal lithium supplement-spray remodeling regeneration method for a waste ternary positive electrode material. The method comprises the following steps: deeply discharging, disassembling and separating the waste ternary lithium battery; putting a positive electrode aluminum foil into a sodium hydroxide solution, and drying, calcining and grinding the stripped wasteternary lithium battery positive electrode material to obtain powder; adding the powder into organic acid for surface activation, then adding a lithium salt solution for hydro-thermal treatment, andthen taking the mixture as a seed crystal to be mixed with a nickel source, a manganese source and a cobalt source to obtain turbid liquid with uniform components; carrying out spray granulation remodeling on the turbid liquid to obtain an NCM precursor, and carrying out two-stage sintering on the NCM precursor and industrial oxygen to obtain a regenerated ternary positive electrode material. According to the invention, the environment-friendly and short-process recycling of the waste ternary positive electrode material is achieved, wherein in-situ repair of lithium can be rapidly achieved inthe hydrothermal lithium supplementing process, and the ternary positive electrode waste obtained after lithium supplementing serves as a seed crystal; in combination with the spray granulation technology, structure remodeling and controllable preparation of the ternary positive electrode material can be achieved.

Description

technical field [0001] The invention belongs to the technical field of secondary resource recycling and circular economy, and relates to a recycling method for waste ternary positive electrode materials, in particular to a hydrothermal lithium supplementation-spray remodeling regeneration method for waste ternary positive electrode materials. Background technique [0002] Since the commercialization of lithium-ion batteries at the end of the 20th century, they have been widely used in portable electronic devices such as mobile phones, notebook computers, cameras, and electric vehicles due to their advantages such as high density, light weight, long life, and no memory. From the perspective of domestic lithium battery application fields, the rapid development of industries such as power, energy storage and 3C has become the main driving force driving the development of the lithium-ion battery industry, and the demand for lithium batteries in the power and energy storage fields...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M10/54
CPCH01M4/505H01M4/525H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 林艳宁培超孟奇张英杰王皓逸杨轩周忠仁董鹏段建国徐明丽李雪
Owner KUNMING UNIV OF SCI & TECH
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