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Preparation method of coated multilayer precursor and application

A precursor and cladding technology, which is applied in the field of the preparation of clad multilayer precursors, can solve the problems of increased battery polarization, less cladding, reduced material rate performance and energy density, etc., so as to improve safety performance. , reduce side reactions, slow down the effect of resistance increase

Inactive Publication Date: 2019-03-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the coating methods are for the treatment of the sintered material, and the sintered active material needs to be treated in an aqueous solution. This coating method has a small amount of coating and cannot form a uniform coating layer, and the coating The material in the layer has no electrochemical activity and cannot have the ability to deintercalate lithium ions, which will hinder the transmission of lithium ions on the surface / interface, resulting in increased battery polarization and reduced rate performance and energy density of the material.

Method used

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  • Preparation method of coated multilayer precursor and application
  • Preparation method of coated multilayer precursor and application
  • Preparation method of coated multilayer precursor and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Example 1 Preparation of ternary cathode material C1

[0105] Prepare a mixed solution according to the molar ratio of Ni, Co, and Mn as 8:1:1, weigh 46.53g, 5.82g, and 5.02g of nickel nitrate hexahydrate, cobalt nitrate hexahydrate, and manganese nitrate tetrahydrate, respectively, and add 100mL of water to dissolve. Prepare 1000mL of a mixed solution of 2mol / L NaOH and 1.5mol / L ammonia water.

[0106] In the reaction kettle protected by argon, add 200mL water, add the mixed solution, 2mol / L NaOH solution and 2mol / L ammonia solution into the reaction kettle at the same time, the final pH of the solution is controlled at 11.5, after the sedimentation is completed, the precipitate Filter and wash, and dry at 80°C to obtain precursor P1, the chemical composition is Ni 0.8 co 0.1 mn 0.1 (HO) 2 .

[0107] Weigh 10g of the above-mentioned P1 precursor, mix according to the molar ratio of lithium salt to precursor 1.05:1, weigh LiOH·H 2 O4.77g was mixed evenly with the ...

Embodiment 2

[0108] Example 2 Preparation of Lithium Iron Phosphate Cathode Material C2

[0109] Weigh 40.40 g of ferric nitrate nonahydrate and 13.21 g of diammonium hydrogen phosphate, and add 100 mL of deionized water to dissolve, respectively, to obtain ferric nitrate solution and diammonium hydrogen phosphate solution. Prepare 100mL of 2mol / L ammonia solution.

[0110] Under the protection of argon, add ferric nitrate solution and diammonium hydrogen phosphate solution into the reaction kettle at the same time, and adjust the pH value to about 5 with ammonia solution. Stir at 40°C for 4 hours. After the sedimentation is over, filter and wash the precipitate, and dry it at 80°C to obtain the precursor P2, whose chemical composition is FePO 4 .

[0111] Weigh 10g of the above-mentioned P2 precursor, mix according to the molar ratio of lithium salt to precursor 1.08:1, weigh LiOH·H 2 Mix O3.00g with the precursor evenly, sinter at 450°C for 6 hours, and then sinter at 750°C for 10 hou...

Embodiment 3

[0112] Example 3 Preparation of lithium cobaltate cathode material C3

[0113] Weigh Co 3 o 4 50g, according to the molar ratio of lithium salt to precursor is 1.05, weigh LiOH·H 2 O27.44g with Co 3 o 4 Mix evenly, sinter at 600°C for 6 hours in an oxygen atmosphere, and then sinter at 900°C for 10 hours to obtain a lithium cobalt oxide cathode material, marked as C3.

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Abstract

The invention discloses a preparation method of a coated multilayer precursor. The method at least comprises the following steps of obtaining a core precursor; and coating the core precursor with a shell precursor by a dry mixing, wet ball milling or co-precipitation method. The method disclosed by the invention has the advantages of simple operation and wide application range.

Description

technical field [0001] The application relates to a preparation method and application of a coated multilayer precursor, which belongs to the field of material preparation. Background technique [0002] A lithium-ion battery is a chemical energy storage device that uses lithium ions to migrate between the positive and negative electrodes inside the battery to store and release energy. Due to the advantages of high energy density, high working voltage, long cycle life and environmental friendliness, lithium-ion batteries are widely used in the electronics and communication industries, and are gradually used in the field of power batteries such as electric vehicles and hybrid vehicles. Therefore, the safety performance and rate performance of lithium-ion batteries have attracted more and more attention. Studies have shown that the electrode reaction of lithium-ion batteries occurs at the electrode / electrolyte interface, so an effective way to improve the electrochemical perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525C01G53/00C01B25/45C01G51/00
CPCC01B25/45C01G51/42C01G53/006H01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 刘孟毕玉敬王德宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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