A kind of preparation method of lithium iron phosphate positive electrode of lithium ion battery

A lithium-ion battery, lithium iron phosphate technology, applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of high temperature cycle and poor storage performance, to improve the degree of dispersion, improve discharge specific capacity and cycle stability Effect

Active Publication Date: 2022-07-19
贵州中伟兴阳储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Materials with high self-discharge generally have poor high-temperature cycle and storage performance

Method used

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  • A kind of preparation method of lithium iron phosphate positive electrode of lithium ion battery
  • A kind of preparation method of lithium iron phosphate positive electrode of lithium ion battery
  • A kind of preparation method of lithium iron phosphate positive electrode of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of a lithium iron phosphate positive electrode of a lithium ion battery specifically comprises the following steps:

[0023] S1: Add polyferric chloride, lithium hydroxide, ammonium phosphate and citric acid in a mass ratio of 0.92:1:1.15:1.10 into distilled water and stir to dissolve, then dropwise add oxalic acid or ammonia water, stir and let stand for 10 hours for later use.

[0024] S2: Place the copper foil in a container filled with distilled water, take it out for drying after ultrasonication for 2 hours, then use 600-mesh sandpaper for grinding, place it in distilled water and anhydrous ethanol solution and ultrasonicate for 1 hour, respectively, and dry for use.

[0025] S3: The product in step S1 is moved to the electrospinning device, the spun silk is received on the copper foil in step S2, and a layer of lithium iron phosphate fiber film is obtained on the copper foil after spinning, and then placed on the copper foil. In a tube furnace...

Embodiment 2

[0027] A preparation method of a lithium iron phosphate positive electrode of a lithium ion battery specifically comprises the following steps:

[0028] S1: Add polymeric ferric sulfate, lithium carbonate, ammonium dihydrogen phosphate and glucose into distilled water according to the mass ratio of 1.08:1.22:1.36:1.56, stir and dissolve, then dropwise add oxalic acid or ammonia water, stir, and let stand for 15 hours for later use.

[0029] S2: place the copper foil in a container filled with distilled water, take it out for drying after sonicating for 3 hours, then use 800-mesh sandpaper for grinding, place it in distilled water and anhydrous ethanol solution for sonication for 2 hours respectively, and dry for use.

[0030] S3: The product in step S1 is moved to the electrospinning device, the spun silk is received on the copper foil in step S2, and a layer of lithium iron phosphate fiber film is obtained on the copper foil after spinning, and then placed on the copper foil. ...

Embodiment 3

[0032] A preparation method of a lithium iron phosphate positive electrode of a lithium ion battery specifically comprises the following steps:

[0033] S1: Add polyferric chloride, lithium acetate, diammonium hydrogen phosphate and citric acid into distilled water in a mass ratio of 0.96:1.06:1.21:1.19, stir and dissolve, then dropwise add oxalic acid or ammonia water, stir and let stand for 12 hours for later use.

[0034] S2: Place the copper foil in a container filled with distilled water, take it out and dry it after sonicating for 2.5 hours, then polish it with 700-grit sandpaper and place it in distilled water and anhydrous ethanol solution for 1.5 hours, respectively, and then dry it for later use. .

[0035] S3: The product in step S1 is moved to the electrospinning device, the spun silk is received on the copper foil in step S2, and a layer of lithium iron phosphate fiber film is obtained on the copper foil after spinning, and then placed on the copper foil. In a tu...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate positive electrode of a lithium ion battery, which comprises the following steps: making an iron source, a lithium source, a phosphorus source and a carbon source in a mass ratio of (0.92-1.08):(1-1.22):(1.15-1.36 ): (1.10~1.56) Add to distilled water and stir to dissolve, add complexing agent dropwise and stir and let stand for 10~15h; place copper foil in a container with distilled water, ultrasonicate for 2~3h, take out and dry, use After grinding with 600-800-mesh sandpaper, place it in distilled water and anhydrous ethanol solution for 1-2 hours respectively, and then sonicate for 1 to 2 hours. The product in step S1 is moved to an electrospinning device, and the spun silk is received in step S2. On the copper foil in the middle, a layer of lithium iron phosphate fiber film is obtained on the copper foil after spinning, and placed in a tube furnace. , and kept at this temperature for 2 to 4 hours, then cooled naturally, took out the copper foil, added N-methylpyrrolidone, binder PVDF and conductive agent Super-C dropwise, and then added N-methylpyrrolidone dropwise again, vacuum drying oven The positive electrode is obtained by drying in the middle.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium iron phosphate positive electrode of a lithium ion battery. Background technique [0002] The lithium iron phosphate material for lithium-ion batteries has excellent safety, long cycle life, good high temperature performance and stable discharge platform, and is the only choice for electric vehicles, energy storage batteries and high-rate power tool batteries. positive electrode material. Lithium iron phosphate materials produced by different processes have considerable performance differences. Among them, the self-discharge problem of lithium iron phosphate material is one of the more serious problems. For example, many lithium iron phosphate materials synthesized by solid-phase method have monthly self-discharge of more than 3%. However, the carbon coating is good, and the monthly self-discharge of the lithium iron ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/58H01M10/0525D01D5/00
CPCH01M4/0471H01M4/0404H01M4/5825H01M10/0525D01D5/0007Y02E60/10
Inventor 谭龙蛟
Owner 贵州中伟兴阳储能科技有限公司
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