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Lithium ferric phosphate material and method for making same

A technology of lithium iron phosphate and raw materials, applied in the field of lithium-ion battery cathode materials, to achieve the effects of improving cycle stability, low cost, and reducing path and resistance

Inactive Publication Date: 2008-06-18
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In summary, the comprehensive performance of the currently known lithium iron phosphate materials has been improved, but it is necessary to fully meet the requirements of industrial production and practical applications with low cost, less pollution, easy control of quality reproducibility, high rate characteristics and high cycle There is still a certain gap in indicators such as stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] C-Li of the present invention 0.98 Zr 0.005 FePO 4 , The following reagents of the composite material are all measured according to 100% purity, and Li is weighed respectively according to the atomic molar ratio Li: Zr: Fe: P=0.98: 0.005: 1: 1 2 CO 3 (200 mesh) 36.202 g, ZrOCl 2 .8H 2 O1.611 g, Fe 2 o 3 (200 mesh) 79.850 grams and H 3 PO 4 98.00 grams, put lithium carbonate, zirconium oxychloride, and ferric oxide in a dry state through preliminary pulverization and mixing, and then put them into a liquid-phase ball mill tank with phosphoric acid, then add 17.873 grams of thermosetting phenolic resin, 7.660 grams of asphalt and no 8 grams of water ethanol, 80 grams of deionized water, ball milled for 3 hours at a speed of 200 revolutions per minute, remove the solvent from the slurry with a high-speed centrifugal spray dryer, set the air inlet temperature of the spray dryer to 200°C, and the air outlet temperature to 80°C To obtain spherical particles with a wa...

Embodiment 2

[0028] Example 2 Preparation of C-Li of the present invention 0.98 Zr 0.005 FePO 4 composite material

[0029] Replace the mixture of phenolic resin and asphalt in embodiment 1 with 13.875 grams of acetylene black, all the other preparation processes are identical with embodiment 1, adopt the weight of acetylene black to record in the lithium iron phosphate composite material to account for 4.4%, tap density 1.25g / cm 3 , the average particle size is 0.83 microns, X-ray diffraction experiment is pure orthorhombic olivine structure lithium iron phosphate. The weight ratio of the coating layer acetylene black and the additional acetylene black in the positive electrode sheet made of lithium iron phosphate composite material is 10% in total, and the content of PVDF is also 10%. The relevant charge and discharge results are listed in Table 1. All discharge specific capacity data do not include the mass of carbon coated on the surface of lithium iron phosphate.

Embodiment 3

[0030] Example 3 Preparation of C-Li of the present invention 0.98 Zr 0.005 FePO 4 composite material

[0031] Replace the mixture of 17.873 gram phenolic resin and 7.660 gram asphalt in embodiment 1 with 26.034 gram phenolic resin, all the other preparation processes are identical with embodiment 1, adopt the weight of phenolic resin pyrolytic charcoal in lithium iron phosphate composite material to be recorded by carbon-fixing instrument Accounting for 3.9%, tap density 1.30g / cm 3 , The average particle size is 0.79 microns.

[0032] In the positive electrode sheet made of lithium iron phosphate composite material, the weight ratio of pyrolytic carbon in the cladding layer and the added acetylene black is 10% in total, and the content of PVDF is also 10%. The relevant charge and discharge results are listed in Table 1.

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Abstract

The invention belonging to a preparation method of LiFePO4 material, the LiFePO4 material is wrapped with 1-10% weight carbon material, the range of the high tap density of the composite material is 1.0-1.6g per cubic centimeter, the range of the diameter of the first particle is 0.1-3 um; the preparation method comprises a ball milling iron source, a Lithium source, a Phosphate source compound, and a dopant that are made into slurry materials; the slurry materials are dried by a spray granulating drier; after sintering and cooling, the slurry materials are ground and classified and then sieved to obtain the LiFePO4 material; as the spray granulating drier is adopted, the tap density is improved; the air inlet temperature is controlled when spray drying, thereby improving circulation stability; as the diameter and distribution of the particles are controlled, the diameter of the first particle is not more than 3um generally, so as to reduce path and resistance of lithium ion dispersion and improve rate characteristic, moreover the invention has low cost and less pollution.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, and in particular relates to a lithium iron phosphate material and a preparation method thereof. Background technique [0002] As the application field of lithium-ion batteries develops from small power supplies for mobile communications, notebook computers, and camcorders to large-capacity, high-power power supplies for electric tools and electric vehicles, it is urgently desired that electrode materials have high safety and high cycle stability. , low price and harmless to the environment. LiMn with cubic spinel structure 2 o 4 and LiFePO with orthorhombic olivine structure 4 It is currently the preferred material for the positive electrode of power lithium-ion batteries. Especially in terms of high-temperature cycle performance, lithium iron phosphate has great advantages over spinel lithium manganese oxide, and is currently a hot spot in the research of power ...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 龚金保付亚娟高英韩宇吴滨城刘兴江汪继强高自明
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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