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Graphene composite lithium iron phosphate positive electrode material and preparation method and application thereof

A graphene composite, lithium iron phosphate technology, applied in nanotechnology for materials and surface science, battery electrodes, electrical components, etc., can solve the problems of uneven conductivity of lithium iron phosphate, poor battery consistency, etc., to improve Multiple properties, excellent conductivity, low cost effect

Inactive Publication Date: 2017-08-18
SUZHOU GRAPHENE NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, researchers have found that adding materials such as graphene and carbon nanotubes to lithium iron phosphate materials can improve the conductivity of lithium iron phosphate to a certain extent, but graphene and carbon nanotubes are difficult to uniformly disperse in In the lithium iron phosphate material, the conductivity of lithium iron phosphate is unbalanced, resulting in poor consistency of the battery

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  • Graphene composite lithium iron phosphate positive electrode material and preparation method and application thereof
  • Graphene composite lithium iron phosphate positive electrode material and preparation method and application thereof
  • Graphene composite lithium iron phosphate positive electrode material and preparation method and application thereof

Examples

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Embodiment 1

[0053] Embodiment 1: a kind of preparation technology of graphene composite lithium iron phosphate cathode material comprises: take lithium carbonate as lithium source, ferrous oxalate is iron source, ammonium dihydrogen phosphate is phosphorus source, sucrose is carbon source, lithium source, Weigh the iron source, phosphorus source and carbon source according to the molar ratio of 1.02:1.0:1.0:0.1, put the weighed materials into the mixer, add sulfonated graphene and pure water at the same time, mix for 2 hours, then transfer to sand Sand mill in the mill for 2 hours until the particle size D50 in the mixed material (solid content about 20wt%) is about 100nm; dry the sanded material at a temperature of 200°C, and dry pure water to obtain a precursor ; Put the precursor into a high-temperature furnace, pass in an inert gas, keep the temperature at 700° C. for 5 hours, and cool to room temperature; obtain the graphene composite lithium iron phosphate cathode material. The SEM ...

Embodiment 2

[0054] Embodiment 2: A preparation process of a graphene composite lithium iron phosphate positive electrode material comprises: lithium hydroxide, iron phosphate, phosphorus pentoxide and phenolic resin are weighed in a molar ratio of 1.10:1.0:1.3:0.5, and weighed The material that gets is put into the mixer, adds sulfonated graphene and deionized water simultaneously, after mixing 1h, transfer to sand mill and carry out sand milling 1h, until the particle size in the mixed material (about 40wt% of solid content) D50 is about 300nm; dry the sand-milled material at 100°C, dry deionized water to obtain the precursor; put the precursor in a high-temperature furnace, pass in an inert gas, and keep it warm at 800°C for 2 hours , cooled to room temperature; the graphene composite lithium iron phosphate cathode material was obtained.

Embodiment 3

[0055] Example 3: A preparation process for a graphene composite lithium iron phosphate positive electrode material includes: weighing lithium dihydrogen phosphate, ferric oxide, diammonium hydrogen phosphate and citric acid at a molar ratio of 1.05:1.10:1.0:0.04 , put the weighed material into the mixer, add sulfonated graphene and deionized water at the same time, after mixing for 0.5h, transfer it to the sand mill and carry out sand milling for 1.5h until the mixed material (solid content is about 25wt%) The particle size D50 in the medium is about 200nm; the sand-milled material is dried at a temperature of 300°C, and the deionized water is dried to obtain a precursor; The temperature was kept at ℃ for 6 hours, and then cooled to room temperature; the graphene composite lithium iron phosphate positive electrode material was obtained.

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Abstract

The invention discloses a graphene composite lithium iron phosphate positive electrode material and a preparation method and an application thereof. The graphene composite lithium iron phosphate positive electrode material comprises an aggregating body of lithium iron phosphate secondary granules and uniformly dispersed graphene; the graphene coats the lithium iron phosphate secondary granules and is distributed among the lithium iron phosphate secondary granules; the preparation method comprises the steps of performing mixing on a lithium source, an iron source, a phosphorous source, a carbon source and sulfonated graphene to form a precursor; performing baking on the precursor in inert atmosphere at a high temperature and then cooling to prepare the graphene composite lithium iron phosphate positive electrode material. The graphene composite lithium iron phosphate positive electrode material provided by the invention has excellent electrical conductivity, rate capability, cycling performance, low temperature performance and the like; when the graphene composite lithium iron phosphate positive electrode material is applied to the lithium ion battery, multiple kinds of performance of the lithium ion battery can be improved greatly; and meanwhile, the graphene composite lithium iron phosphate positive electrode material has simple and controllable preparation process and low cost, so that large-scale production can be facilitated.

Description

technical field [0001] The invention relates to a positive electrode material applicable to lithium ion batteries, in particular to a graphene composite lithium iron phosphate positive electrode material and a preparation method and application thereof. Background technique [0002] As a new type of green energy, lithium-ion batteries have been widely used in electric bicycles, electric bicycles and Automobiles, electric buses and other fields, and gradually replace traditional batteries in national defense and military industry, aerospace navigation, artificial satellites and military communication equipment. With rapid development in just over ten years, lithium-ion batteries have surpassed and partially replaced traditional lead-acid batteries and nickel-metal hydride batteries in the power battery market, and have gradually become the mainstream of secondary batteries. [0003] The existing cathode materials for lithium-ion batteries are mainly lithium cobaltate, lithiu...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/5825H01M4/587H01M10/0525Y02E60/10
Inventor 高俊强蒋永华相喜郭阳
Owner SUZHOU GRAPHENE NEW MATERIAL TECH
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