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Preparation method of regenerated ternary positive electrode material of lithium nickel cobalt oxide battery

A cathode material, lithium nickel cobalt oxide technology, which is applied in the field of preparation of regenerated ternary cathode materials for nickel cobalt lithium batteries, can solve the problems of poor control of the particle size of the cathode, many side reactions, poor electrochemical performance, etc., and achieve excellent Electrochemical performance, preparation method is simple and easy to operate, and the effect of less environmental pollution

Pending Publication Date: 2022-01-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the obtained product is too single, the particle size of the obtained positive electrode is not easy to control, and there are many side reactions, and the electrochemical performance is poor.

Method used

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  • Preparation method of regenerated ternary positive electrode material of lithium nickel cobalt oxide battery
  • Preparation method of regenerated ternary positive electrode material of lithium nickel cobalt oxide battery
  • Preparation method of regenerated ternary positive electrode material of lithium nickel cobalt oxide battery

Examples

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Embodiment 1

[0029] This embodiment includes the following steps:

[0030] (1) Soak and discharge the waste nickel-cobalt lithium battery in 2% sodium chloride solution for 20 hours, then dry and disassemble it, soak it in a sodium hydroxide solution with a concentration of 6mol / L for 1 hour, filter and wash to obtain black powder;

[0031] (2) Take 10 g of black powder (lithium nickel cobaltate active material), put the obtained black powder and iron powder in a mass ratio of 1:1 in a muffle furnace at 800°C for 8 hours;

[0032] (3) Get lithium nickel cobaltate active material 10g, then lithium nickel cobalt acid active material is dissolved in 4mol / L sulfuric acid, control filtrate pH to be 2, add 10L extraction agent, the component of extraction agent is volume fraction is 30% P204 and sulfonated kerosene with a volume fraction of 70%, the equilibration time is 15min, and back extraction with 5L 2mol / L sulfuric acid, the equilibration time is 15min, and the obtained solution is a mixed...

Embodiment 2

[0037] (1) Soak and discharge the waste nickel-cobalt lithium battery in 5% sodium chloride solution for 18 hours, then dry and disassemble it, soak it in a calcium hydroxide solution with a concentration of 8mol / L for 1.5 hours, filter and wash to obtain black powder ;

[0038] (2) Take 20 g of black powder (lithium nickel cobaltate active material), put the obtained black powder and iron powder in a mass ratio of 1:1.5 in a muffle furnace at 800°C for 6 hours;

[0039] (3) Get 20g of the lithium nickel cobalt oxide active material, then dissolve the lithium nickel cobalt oxide active material in 4mol / L nitric acid, control the pH of the filtrate to be 2, add 20L extractant, the component of the extractant is 30% by volume P507 and sulfonated kerosene with a volume fraction of 70%, the equilibration time is 15min, and then back-extracted with 10L 2mol / L sulfuric acid, the equilibration time is 15min, and the obtained solution is a mixed solution of nickel nitrate and cobalt n...

Embodiment 3

[0044] (1) Soak and discharge the waste nickel-cobalt lithium battery in 4% sodium chloride solution for 16 hours, then dry and disassemble it, soak it in an ammonia solution with a concentration of 5mol / L for 1.5 hours, filter and wash to obtain black powder;

[0045] (2) Take 10 g of black powder (lithium nickel cobaltate active material), and place the obtained black powder and sulfur powder in a tube furnace at 900° C. in an argon atmosphere at a mass ratio of 1:1.5 for 8 hours;

[0046] (3) Get lithium nickel cobaltate active material 10g, then lithium nickel cobalt acid active material is dissolved in 4mol / L nitric acid, control filtrate pH to be 2, add 10L extraction agent, the component of extraction agent is volume fraction is 30% P304 and sulfonated kerosene with a volume fraction of 70%, the equilibration time is 15min, and then back-extracted with 5L 2mol / L sulfuric acid, the equilibration time is 15min, and the obtained solution is a mixed solution of nickel nitrat...

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Abstract

The invention discloses a preparation method of a regenerated ternary positive electrode material of a lithium nickel cobalt oxide battery. The method comprises the following steps: (1) discharging waste lithium ion batteries by adopting a sodium chloride solution, conducting disassembling, soaking a positive plate in alkali liquor, and conducting filtering to obtain black powder; (2) carrying out reduction roasting on the obtained black powder in a protective gas atmosphere; (3) dissolving the black powder in an acid solution, and conducting extraction and impurity removal, so as to obtain a high-purity mixed solution containing nickel and cobalt; (4) after the concentrations of cobalt and nickel ions are measured, adding a corresponding manganese source and a corresponding tungsten source into the solution, adjusting the pH value, and carrying out a coprecipitation reaction to obtain a precursor; and (5) mixing and sintering the precursor, a lithium source and a boron source to obtain the positive electrode material. According to the method provided by the invention, not only is pollution generated by the waste lithium ion battery effectively reduced, but also the waste lithium nickel cobalt oxide material can be recycled and regenerated into the ternary positive electrode material, and the positive electrode material has excellent electrochemical performance.

Description

technical field [0001] The invention relates to the field of lithium ion battery recycling, in particular to a preparation method of a regenerated ternary positive electrode material for a lithium nickel cobalt oxide battery. Background technique [0002] The first wave of power battery decommissioning came in 2018, and by 2020, decommissioned lithium-ion batteries will reach more than 60 gigawatt hours. By 2030, the number of people worldwide using electric vehicles will reach 228 million. With the rapid growth of electric vehicles, the annual demand for lithium-ion batteries is also growing rapidly, which means that more and more lithium-ion batteries will face retirement in the future. Since waste lithium-ion batteries contain heavy metals, organic solvents, and harmful electrolytes, if they are not recycled, they will cause great harm to the environment. At the same time, by 2020, the value of impurity metals in waste lithium-ion batteries has reached 10.1 billion yuan...

Claims

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Application Information

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IPC IPC(8): C01B35/10H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/54
CPCC01B35/10C01B35/1027H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/54C01P2004/03C01P2006/40H01M2004/028Y02E60/10Y02W30/84
Inventor 欧星萧厚桂刘赟张宝明磊
Owner CENT SOUTH UNIV
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