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Method for directly preparing lithium zincate modified ternary cathode material from waste lithium battery cathode material

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, high product quality and improving recovery rate.

Active Publication Date: 2020-12-22
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 lithium zincate modified ternary cathode material from waste lithium battery cathode material
  • Method for directly preparing lithium zincate modified ternary cathode material from waste lithium battery cathode material
  • Method for directly preparing lithium zincate modified ternary cathode material from waste lithium battery cathode material

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 roast 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 preparation of ternary material precursors, and in particular relates to a method for directly preparing a lithium zincate modified ternary positive electrode material by using the positive electrode material of a waste lithium battery: separating the positive electrode material from the waste lithium ion battery; using caustic soda The solution is leached and filtered; carbonate is added to the filtrate to obtain lithium carbonate; the filter cake is leached with sulfuric acid to obtain a leaching solution; the molar ratio of nickel, cobalt and manganese in the leaching solution is adjusted; the leaching solution, ammonia solution, and caustic alkali solution are flowed into the reactor , co-precipitate to prepare ternary material precursor; then mix and roast with lithium carbonate to obtain ternary positive electrode material; mix zinc acetate, ethylene glycol plus ether, amines, and lithium methoxide, and add ternary positive electrode material to obtain gel , the ternary cathode material modified by lithium zincate was obtained by roasting. The ternary cathode material modified by lithium zincate of the present invention has strong structural stability, good electrochemical performance, reduced production cost, high product quality, and realizes the directional circulation of nickel, cobalt, manganese and lithium resources.

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 Patents(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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