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Nano-lithium iron phosphate composite cathode material suitable for aqueous binder system and preparation method thereof

A technology of composite positive electrode material and water-based binder, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of difficult dispersion and high viscosity of slurry, and achieve simple process, Improved processability and high practicality

Active Publication Date: 2018-08-10
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the production technologies of lithium iron phosphate are mainly high-temperature solid-phase method, hydrothermal method, and sol-gel method. These methods have their own advantages and disadvantages. Through process control, the preparation of nano-lithium iron phosphate cathode materials is quite mature, but Nano-lithium iron phosphate materials have disadvantages such as difficulty in dispersion and high viscosity of the slurry during application. Therefore, it is necessary to modify its surface to improve the processing performance of the slurry, so as to facilitate the popularization and application of lithium iron phosphate.

Method used

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  • Nano-lithium iron phosphate composite cathode material suitable for aqueous binder system and preparation method thereof
  • Nano-lithium iron phosphate composite cathode material suitable for aqueous binder system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh Li 2 CO 3 , ferric phosphate, the molar ratio is 1: 1, add sucrose and mix, the add-on of sucrose is 10% of mixture total mass, with deionized water as grinding medium, its add-on is 4 times of solid total mass, grind 1 hour, The obtained slurry is dried by a spray drying method and fired at a high temperature in an atmosphere furnace to obtain a lithium iron phosphate / carbon composite material with an average particle size of primary particles not greater than 200nm.

[0026] 100g absolute ethanol, 10g deionized water, 5g (26% weight content, the same below) ammoniacal liquor, stir and mix evenly at room temperature, add 5.75g lithium iron phosphate / carbon powder, then add 5g ethyl orthosilicate dropwise ( chemically pure, the same below), stirred and reacted at room temperature for 24 hours to obtain a lithium iron phosphate / carbon composite material coated with nano silicon dioxide. 0.1 g of silane coupling agent γ-(methacryloyloxy)propyltrimethoxysilane was ...

Embodiment 2

[0028] Weigh LiOH, ferric phosphate, the molar ratio is 1: 1, add glucose and mix, the addition of glucose is 10% of the total mass of the mixture, with deionized water as the grinding medium, the addition is 4 times of the total mass of the solid, grind After 1 hour, the obtained slurry was dried by spray drying method, and fired at a high temperature in an atmosphere furnace to obtain a lithium iron phosphate / carbon composite material with an average particle size of primary particles not greater than 200nm.

[0029] 100g absolute ethanol, 40g deionized water, 20g (26% by weight, the same below) ammoniacal liquor, stir and mix evenly at room temperature, add 32g lithium iron phosphate / carbon powder, then add 25g ethyl orthosilicate dropwise (chemical pure, the same below), stirred and reacted at room temperature for 6 hours, and obtained a lithium iron phosphate / carbon composite material coated with nano silicon dioxide on the surface. 2.5 g of silane coupling agent γ-(metha...

Embodiment 3

[0031] Weigh Li 2 CO 3 , ferric phosphate, the molar ratio is 1: 1.05, add sucrose and mix, the add-on of sucrose is 10% of mixture total mass, with deionized water as grinding medium, its add-on is 4 times of solid total mass, grind 1 hour, The obtained slurry is dried by a spray drying method and fired at a high temperature in an atmosphere furnace to obtain a lithium iron phosphate / carbon composite material with an average particle size of primary particles not greater than 200nm.

[0032] 90g dehydrated alcohol, 10g deionized water, 8g (26% weight content, the same below) ammoniacal liquor, stir and mix evenly at room temperature, add 8g lithium iron phosphate / carbon powder, then add 8g ethyl orthosilicate dropwise (chemical pure, the same below), stirred and reacted at room temperature for 6 hours, and obtained a lithium iron phosphate / carbon composite material coated with nano silicon dioxide on the surface. 0.4 g of silane coupling agent γ-(methacryloyloxy)propyltrime...

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Abstract

The invention discloses a lithium iron phosphate nanocomposite cathode material suitable for an aqueous binder system. The lithium iron phosphate nanocomposite cathode material comprises a main material lithium iron phosphate / carbon powder, and a composite layer which coats the main material and contains a silicon dioxide layer, a water-soluble polymer layer and a metal nanoparticle layer. The main material is formed by mixing a ferric phosphate or its aquo-compound, a lithium source compound and a carbon source compound and heating. The composite layer is a surface composite layer formed successively by silicon source compound hydrolysis, organic monomer polymerization and metal ion reduction. A preparation method of the lithium iron phosphate nanocomposite cathode material comprises the following steps: (1) preparation of a lithium iron phosphate / carbon / silica composite material; (2) surface modification of the lithium iron phosphate / carbon / silica composite material; (3) the lithium iron phosphate / carbon / silica composite material's surface grafting with a water-soluble polymer; and (4) the composite material's surface loading of metal nanoparticles. According to the invention, dispersity of the material in the aqueous binder system and processability are remarkably improved.

Description

technical field [0001] The invention relates to a nano-lithium iron phosphate composite cathode material suitable for a water-based binder system and a preparation method thereof, belonging to the technical field of electrochemical energy materials. Background technique [0002] Lithium-ion battery is a high-efficiency energy storage device with a wide range of applications, and its development trend is towards higher energy density, ultra-long cycle life and high safety. Lithium iron phosphate, as one of the cathode materials of lithium-ion batteries, is currently widely used as the cathode material, especially because of its long cycle life, outstanding safety and low production cost, it has attracted much attention from the industry. [0003] At present, in the industrial production of lithium-ion batteries, organic solvent systems are mostly used. The most widely used binder is polyvinylidene fluoride (PVDF), and N-methylpyrrolidone (NMP), N, N-dimethylformaldehyde Smal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62B82Y30/00
CPCY02E60/10
Inventor 刘丙学张向军樊腾飞杨容刘冠伟赵挺张洪坤江丹平王琦宫颂
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG