Preparation method of high-compaction lithium iron phosphate

A real lithium iron phosphate, high-voltage technology, applied in chemical instruments and methods, phosphorus compounds, nanotechnology for materials and surface science, etc., can solve the problem that lithium iron phosphate cannot improve both the electronic conductivity and ion conductivity of lithium iron phosphate Improve the intrinsic conductivity, improve the gram capacity, and improve the compacted density and conductivity

Pending Publication Date: 2022-05-27
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the problem of increasing the compacted density of lithium iron phosphate by increasing the particle size of the material and reducing the amount of carbon coating in the prior art, the present invention provides a A preparation method for high-pressure compacted lithium iron phosphate, which improves the compacted density and electrical conductivity of lithium iron phosphate, thereby improving the performance of gram capacity

Method used

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  • Preparation method of high-compaction lithium iron phosphate
  • Preparation method of high-compaction lithium iron phosphate
  • Preparation method of high-compaction lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) According to a total of 1.5 g of LiFe 0.95 Ca 0.05 PO 4 The stoichiometric ratios of lithium acetate, phosphoric acid, ferric chloride and calcium chloride are weighed respectively;

[0034] (2) Lithium acetate is added to the absolute ethanol containing 5% (wt) polyethylene glycol, and is continuously stirred until a clear clear liquid is formed;

[0035] (3) Add ammonium dihydrogen phosphate, iron oxalate and calcium chloride to the above clear liquid, stir well for 5 hours to obtain a sol, transfer the sol to a watch glass, dry at 80°C for 15 hours to obtain a gel, and grind the gel into powder;

[0036] (4) calcining the powder in a reducing atmosphere, calcining at 500 ℃ for 2 hours, and then calcining at 800 ℃ for 8 hours;

[0037] (5) Naturally cooled to room temperature, and ground to obtain powdery lithium iron phosphate.

[0038] The morphology of the calcined lithium iron phosphate powder in Example 1 was observed by SEM, as shown in figure 1 , fi...

Embodiment 2

[0040] (1) According to a total of 1.5 g of LiFe 0.97 Zn 0.03 PO 4 The stoichiometric ratios of lithium hydroxide, phosphoric acid, ferric chloride and zinc nitrate are weighed respectively;

[0041] (2) Lithium hydroxide is added to the absolute ethanol containing 2% (wt) cetyl trimethyl ammonium bromide, stirring constantly, until transparent clear liquid is formed;

[0042] (3) adding phosphoric acid, ferric chloride and zinc nitrate to the above clear liquid, fully stirring for 4h to obtain a sol, transferring the sol to a watch glass, drying at 85°C for 13h to obtain a gel, and grinding into powder;

[0043](4) calcining the powder in a reducing atmosphere, calcining at 400°C for 3h, and then calcining at 600°C for 10h;

[0044] (5) Naturally cooled to room temperature, and ground to obtain powdery lithium iron phosphate.

Embodiment 3

[0046] (1) According to a total of 1.5 g of LiFe 0.98 Zn 0.03 PO 4 The stoichiometric ratios of lithium hydroxide, phosphoric acid, ferric chloride and zinc nitrate are weighed respectively;

[0047] (2) Lithium hydroxide is added to the absolute ethanol containing 2% (wt) cetyl trimethyl ammonium bromide, stirring constantly, until transparent clear liquid is formed;

[0048] (3) adding phosphoric acid, ferric chloride and zinc nitrate to the above clear liquid, fully stirring for 4h to obtain a sol, transferring the sol to a watch glass, drying at 85°C for 13h to obtain a gel, and grinding into powder;

[0049] (4) calcining the powder in a reducing atmosphere, calcining at 350°C for 3h, and then calcining at 750°C for 10h;

[0050] (5) Naturally cooled to room temperature, and ground to obtain powdery lithium iron phosphate.

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Abstract

The invention relates to the field of lithium iron phosphate batteries, and discloses a preparation method of high-compaction lithium iron phosphate in order to solve the problem that the electronic conductivity and the ionic conductivity of the lithium iron phosphate cannot be improved at the same time when the compaction density of the lithium iron phosphate is improved by a method for improving the particle size of a material and reducing the carbon coating amount in the prior art. The preparation method comprises the following steps: dissolving a surfactant in an ethanol aqueous solution, adding a lithium source into the ethanol aqueous solution, and stirring to obtain a transparent solution; adding a phosphorus source, an iron source and a doped metal raw material into the solution, and stirring to obtain gel; drying the gel, grinding into powder, and calcining the powder by using a two-stage method; and calcining the powder, cooling to room temperature, and grinding to obtain powdery lithium iron phosphate. The prepared lithium iron phosphate particles are uniform in particle size distribution and free of obvious agglomeration, the compaction density and the conductivity of the lithium iron phosphate are jointly improved through an amorphous carbon layer network on the surface and doping of internal metal ions, and then the gram volume exertion is improved.

Description

technical field [0001] The invention relates to the field of lithium iron phosphate batteries, in particular to a method for preparing high-pressure lithium iron phosphate. Background technique [0002] The compaction density has a great influence on the battery performance, and the compaction density is closely related to the specific capacity, efficiency, internal resistance and battery cycle performance. Generally speaking, under certain process conditions, the higher the compaction density, the higher the energy density of the battery, so the compaction density is also regarded as one of the reference indicators for improving the energy density of lithium iron phosphate batteries. [0003] The preparation method of the existing high-pressure compaction material of lithium iron phosphate is mainly to directly increase the particle size of primary particles or construct secondary particles to increase the particle size of the material, or to reduce the amount of carbon coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C01B32/15B82Y30/00B82Y40/00H01M4/58H01M10/0525
CPCC01B25/45C01B32/15B82Y30/00B82Y40/00H01M4/5825H01M10/0525C01P2004/62C01P2004/61C01P2006/40C01P2004/80C01P2006/11Y02E60/10
Inventor 刘瑞龙吴晨琰王涌刘亚东杨光
Owner WANXIANG 123 CO LTD
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