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Composition for preparing lithium iron phosphate material, lithium iron phosphate material, and preparation method and application of lithium iron phosphate material

A technology of lithium iron phosphate and composition, applied in the field of lithium ion batteries, can solve problems such as low compaction density, and achieve the effect of improving compaction density

Active Publication Date: 2020-07-03
GUIZHOU ANDA TECH ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the compaction density of the lithium iron phosphate material in the prior art is on the low side

Method used

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  • Composition for preparing lithium iron phosphate material, lithium iron phosphate material, and preparation method and application of lithium iron phosphate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Composition S1 was used to prepare a lithium iron phosphate material with a boron doping amount of 100ppm, as follows:

[0055]Composition S1 contains iron phosphate, lithium carbonate, glucose and boric acid, based on the total weight of the composition, the content of the iron phosphate is 70% by weight, the content of the lithium source is 20% by weight, the The carbon source content is 9.974% by weight; and the boric acid content is 45 ppm based on the boron element contained therein.

[0056] (1) In the presence of pure water, each component in 1000 g of composition S1 was mixed by ball milling at 25° C., the rotation speed was 100 rpm, and the time was 4 hours to obtain the first mixture;

[0057] (2) Drying and sintering the first mixture obtained in step (1) sequentially, the drying conditions include: the drying temperature is 250°C; the sintering conditions include: under nitrogen atmosphere, the pressure is 150Pa , the sintering temperature is 700°C, the sin...

Embodiment 2-5

[0059] Using a method similar to Example 1, the difference is that the formulation of the composition used is different, and the rest are the same as in Example 1 to prepare lithium iron phosphate materials with different boron doping amounts, specifically:

Embodiment 2

[0060] Example 2: Composition S2 was used to prepare a lithium iron phosphate material with a boron doping amount of 200 ppm.

[0061] Composition S2 contains iron phosphate, lithium carbonate, glucose and boric acid, based on the total weight of the composition, the content of the iron phosphate is 70% by weight, the content of the lithium source is 20% by weight, the The content of the carbon source is 9.945% by weight; and the content of the boric acid is 95 ppm based on the boron contained therein.

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a composition for preparing a lithium iron phosphate material, the lithium iron phosphate material, and a preparation method and an application of the lithium iron phosphate material. The composition contains iron phosphate, a lithium source, a carbon source and a boron-containing compound; based on the total weight of the composition, the content of iron phosphate is 50-85 wt%, the content of the lithium source is 5-30 wt%, and the content of the carbon source is 5-30 wt%; and the content of the boron-containing compound in terms of the boron element contained therein is 5-240 ppm. When the composition provided by the invention is used for preparing the lithium iron phosphate material, the size of lithiumiron phosphate primary particles can be changed, and the control on the size of the lithium iron phosphate primary particles is realized, so that the compaction density of the lithium iron phosphatematerial is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composition for preparing lithium iron phosphate materials, a method for preparing lithium iron phosphate materials, lithium iron phosphate materials prepared by the method, and the iron phosphate Application of lithium materials in lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as mobile phones, notebooks, and digital cameras due to their advantages such as high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life. [0003] Among them, lithium iron phosphate, as the main cathode material of lithium-ion power batteries, has the advantages of good safety performance and good cycle performance, and has attracted everyone's attention. However, lithium iron phosphate materials have defects such as low compaction dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45C01P2004/61C01P2006/40H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 尹习畅陈明郭刚强蒋俭军
Owner GUIZHOU ANDA TECH ENERGY CO LTD