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Method for directly preparing ternary positive electrode material modified by lithium zinc oxide by utilizing positive electrode material of waste lithium battery

A technology for waste lithium batteries and cathode materials, which is applied in the field of preparation of ternary material precursors, can solve problems such as poor stability of ternary cathode materials, and achieve the effects of improving electrochemical performance, good economy, and realizing directional circulation.

Active Publication Date: 2018-11-23
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing ternary cathode materials prepared from waste lithium battery cathode materials generally have the defect of poor stability.

Method used

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  • Method for directly preparing ternary positive electrode material modified by lithium zinc oxide by utilizing positive electrode material of waste lithium battery
  • Method for directly preparing ternary positive electrode material modified by lithium zinc oxide by utilizing positive electrode material of waste lithium battery
  • Method for directly preparing ternary positive electrode material modified by lithium zinc oxide by utilizing positive electrode material of waste lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Disassemble and separate the positive electrode sheet from the waste lithium-ion battery and bake it at 650°C for 15 minutes. The obtained roasted product is crushed on a crusher, sieved, and the positive electrode material is separated from the aluminum foil; the molar ratio of nickel, cobalt, and manganese in the positive electrode material 5:2:3 and 8:1:1;

[0049] The positive electrode material was leached with 2.5 mol / L sodium hydroxide solution at 95°C for 40 minutes, the liquid-solid ratio of the sodium hydroxide solution to the positive electrode material was 10:1 during leaching, and the filtrate and filter cake were obtained by filtration;

[0050] Add sodium carbonate whose molar number is 0.5 times of the lithium ion molar number in the filtrate, stir and react at 25°C for 60min, generate a turbid liquid, filter to obtain lithium carbonate solid and filtrate, and the filtrate is 2.2mol / L sodium hydroxide solution; The recovery rate was 94.6%;

[0051] The ...

Embodiment 2

[0057] Disassemble and separate the positive electrode sheet from the waste lithium-ion battery and bake it at 580°C for 30 minutes. The obtained roasted product is crushed on a crusher, sieved, and the positive electrode material is separated from the aluminum foil; the molar ratio of nickel, cobalt, and manganese in the positive electrode material 3:3:3 and 4:2:2;

[0058] The positive electrode material was leached with 2.0 mol / L potassium hydroxide solution at 75°C for 60 minutes, the liquid-solid ratio of the potassium hydroxide solution to the positive electrode material was 8:1 during leaching, and the filtrate and filter cake were obtained by filtration;

[0059] Add potassium carbonate whose molar number is 0.5 times the lithium ion molar number in the filtrate, stir and react at 40°C for 50min, generate a turbid liquid, filter to obtain lithium carbonate solid and filtrate, and the filtrate is potassium hydroxide solution of 1.5mol / L; The recovery rate was 94.2%;

...

Embodiment 3

[0066] Disassemble and separate the positive electrode sheet from the waste lithium-ion battery and bake it at 500°C for 45 minutes. The obtained roasted product is crushed on a crusher, sieved, and the positive electrode material is separated from the aluminum foil; the molar ratio of nickel, cobalt, and manganese in the positive electrode material 8:1:1 and 4:2:2;

[0067] The positive electrode material was leached with 1.5mol / L potassium hydroxide solution at 50°C for 100 minutes, the liquid-solid ratio of the potassium hydroxide solution to the positive electrode material was 6:1 during leaching, and the filtrate and filter cake were obtained by filtration;

[0068] Add potassium carbonate whose molar number is 0.5 times the lithium ion molar number in the filtrate, stir and react at 65°C for 30min, generate a turbid liquid, filter to obtain lithium carbonate solid and filtrate, and the filtrate is potassium hydroxide solution of 1.0mol / L; The recovery rate is 94.5%;

[...

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Abstract

The invention belongs to the technical field of ternary material precursor preparation, in particular to a method for directly preparing a ternary positive electrode material modified by lithium zincoxide by utilizing a positive electrode material of a waste lithium battery. The method comprises the steps of separating out the positive electrode material from the waste lithium ion battery; performing leaching with a caustic alkali solution, and filtering; adding carbonate into the filtrate to obtain lithium carbonate; leaching a filter cake by using sulfuric acid, so that a leaching solutionis obtained; adjusting the molar ratio of nickel, cobalt and manganese in the leaching solution; performing parallel flow on the leaching solution, an ammonia water solution and the caustic alkali solution into a reaction kettle, and carrying out co-precipitation to prepare a ternary material precursor; performing mixing and roasting on the ternary material precursor with lithium carbonate, so asto obtain a ternary positive electrode material; and enabling zinc acetate, ethylene glycol methyl ether, amine and methanol lithium to be mixed, and adding the ternary positive electrode material toobtain gel, and performing roasting on the gel to obtain the lithium zinc oxide modified ternary positive electrode material. The lithium zinc oxide modified ternary positive electrode material is high in structural stability and high in electrochemical performance, the production cost is lowered, the product quality is high, and directional circulation of the nickel-cobalt-manganese-lithium resources is realized.

Description

technical field [0001] The invention belongs to the technical field of preparation of ternary material precursors, and in particular relates to a method for directly preparing lithium zincate modified ternary positive electrode materials by utilizing waste lithium battery positive electrode materials. Background technique [0002] Global energy consumption and carbon dioxide emissions are showing an exponential growth trend, and the demand for new renewable energy is also increasing. Since 2014, policies related to new energy vehicles have been introduced intensively. With the continuous improvement of power battery technology, the entire industrial chain has entered a period of rapid development, and the shipment of power batteries has shown a rapid growth trend. In 2018, the first batch of power batteries will be retired. tide. Ternary lithium-ion batteries have a high recycling value among consumer batteries. In the next three years, the decommissioning scale of ternary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/54
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 张亚莉王鸣陈霞景晓华王晶楚玮张洋
Owner SHANDONG UNIV OF TECH
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