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A high magnification spherical lithium iron phosphate carbon composite positive electrode material and a preparation method thereof

A technology of lithium iron phosphate and positive electrode materials, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problem of low conductivity of materials, insufficient cracking reaction of organic gases, and unfavorable uniform coating of carbon and other problems, to achieve the effect of improving electrical conductivity, fine grain size and good crystallization

Active Publication Date: 2019-01-11
湖南桑瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method provided in this reference document can improve the rate performance and tap density of the material, but the organic gas used is methane, acetylene, etc., and its cracking temperature is normally above 1000°C, while the actual sintering temperature is about 700°C. The gas cannot fully undergo the cracking reaction, which is not conducive to the uniform coating of carbon; at the same time, the carbon coating only occurs on the outer surface of the secondary particles, and the inside of the particles is not coated, which will lead to low electrical conductivity of the material

Method used

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  • A high magnification spherical lithium iron phosphate carbon composite positive electrode material and a preparation method thereof
  • A high magnification spherical lithium iron phosphate carbon composite positive electrode material and a preparation method thereof
  • A high magnification spherical lithium iron phosphate carbon composite positive electrode material and a preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0096] (1) Ferric phosphate, lithium source, carbon source A, dispersant, and metal oxide additives are proportioned according to the proportion: the lithium source is lithium hydroxide, and the quality of Li in lithium hydroxide accounts for 7.2% of the iron phosphate mass ratio; carbon source A adopts glucose, accounting for 8% of the mass ratio of iron phosphate; the metal oxide additive adopts titanium dioxide, accounting for 1.2% of the mass ratio of iron phosphate; the dispersant adopts PEG6000, accounting for 0.5% of the mass ratio of iron phosphate; after adding pure water for rough grinding for 1.0h, the obtained Slurry A: Slurry A is ultrafinely ground for 6 hours to obtain slurry B with a particle size D50 of 50-100 nm, and the solid content of the slurry is controlled to 40%, and then the slurry B is spray-dried to obtain a lithium iron phosphate precursor Powder, the particle size is 1μm~6μm;

[0097] (2) Place the lithium iron phosphate precursor powder in a nitr...

Embodiment 2

[0099](1) Ferric phosphate, lithium source, carbon source A, dispersant, and metal oxide additives are batched according to the formula: the lithium source is lithium carbonate, and the Li element in lithium carbonate accounts for 7.5% of the iron phosphate mass ratio; carbon source A adopts starch , accounting for 10% of the mass ratio of iron phosphate; the additive is Al2O3, accounting for 1.6% of the mass ratio of iron phosphate; the dispersant is PEG2000, accounting for 1.5% of the mass ratio of iron phosphate; after adding pure water for rough grinding for 1.0h, the slurry A is obtained ; Ultrafine milling of slurry A for 4 hours to obtain slurry B with a particle size D50 of 50-300 nm, control the solid content to 45%, and then spray-dry slurry B to obtain a lithium iron phosphate precursor with a particle size of 1 μm to 6 μm body powder;

[0100] (2) Place the lithium iron phosphate precursor powder in a helium atmosphere rotary furnace for heat treatment gradient tem...

Embodiment 3

[0102] (1) Ferric phosphate, lithium source, carbon source A, dispersant, and metal oxide additives are formulated according to the formula: the lithium source is lithium acetate, and the Li element in lithium acetate accounts for 8.0% of the mass ratio of iron phosphate; carbon source A uses fiber element, accounting for 12.5% ​​of the mass ratio of ferric phosphate; the additive is magnesium oxide, accounting for 5.0% of the mass ratio of ferric phosphate; the dispersant is PEG4000, accounting for 0.8% of the mass ratio of ferric phosphate; after adding pure water for rough grinding for 1.0h, slurry A is obtained; Ultrafine milling of slurry A for 5 hours to obtain slurry B with a particle size D50 of 50-400 nm, control the solid content to 35%, and then spray-dry slurry B to obtain a lithium iron phosphate precursor with a particle size of 1 μm to 10 μm Powder;

[0103] (2) Place the lithium iron phosphate precursor powder in an argon atmosphere rotary furnace for heat trea...

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Abstract

A high magnification spherical lithium iron phosphate composite positive electrode material and preparation method are provided. The positive electrode material comprises the following raw material components: iron phosphate, lithium source, carbon source A, metal oxide additive, dispersant and carbon source B; among them, Li element in lithium source accounts for 6.0% -8.0% of the mass of iron phosphate; carbon source A accounts for 0.3%-12.5% of the mass of iron phosphate; the metal oxide additive accounts for 0.5%-5.0% of the mass of ferric phosphate; the dispersant accounts for 0.2%-1.5% of the mass of ferric phosphate; carbon source B accounts for 1% -15.0% of the mass of iron phosphate. The preparation method comprises the following steps: (1) grinding the ingredients; (2) spray drying and granulating; (3) heat treatment, adding carbon source A and metal oxide additive in the grinding process, adding carbon source B in the heat treatment process. The lithium iron phosphate positive electrode material prepared by the invention is spherical shape particles, the surface and the interior of the lithium iron phosphate positive electrode material are uniformly coated with metal-doped carbon, the conductivity is high, the crystallinity is good, the compaction density is 1.3 g / cm3 to 1.8 g / cm3, and the 10C discharge capacity can reach 148mAh / g.

Description

technical field [0001] The invention relates to a positive electrode material and a preparation method thereof, in particular to a high-rate spherical lithium iron phosphate carbon composite positive electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery positive electrode materials. technical background [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less self-discharge, no memory effect and high cost performance, and have become rechargeable batteries in high-power electric vehicles, artificial satellites, aerospace and other fields The main selection object of the power supply. Therefore, lithium-ion batteries and related materials have become a research hotspot for researchers. Cathode material is one of the key materials of lithium-ion batteries, which determines the performance of lithium-ion batteries. At present, the biggest bottlen...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 汪紫煌王长伟李东南商士波陈韬殷磊彭子良
Owner 湖南桑瑞新材料有限公司
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