Lithium iron phosphate power battery and preparation method thereof

A technology of lithium iron phosphate and power battery, which is applied in the field of lithium iron phosphate energy storage power battery, which can solve the problems of process influence, high temperature performance, and large specific surface area of ​​nano-materials, so as to improve high and low temperature performance and high safety Performance, improvement of high temperature performance and safety performance

Inactive Publication Date: 2015-03-04
YUNNAN TIN GROUP HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The specific surface area of ​​nanomaterials is too large, which will affect the process
and affect high temperature performance

Method used

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  • Lithium iron phosphate power battery and preparation method thereof
  • Lithium iron phosphate power battery and preparation method thereof
  • Lithium iron phosphate power battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1865140-10

[0018] Example of the present invention 1865140-10Ah lithium iron phosphate lithium ion battery

Embodiment 1

[0020] 1. Secondary particles formed by agglomeration of primary nanoparticles of positive active material D50 (1-3um). The negative electrode adopts high-layer spacing artificial graphite with amorphous carbon coating structure. It is beneficial to improve the high and low temperature performance of the battery.

[0021] 2. The diaphragm is made of PP, PE, PP with a high air permeability diaphragm, and the air permeability is ≤300s / 100ml.

[0022] 3. The electrolyte adopts high and low temperature solvent formula, containing EC25%-35%, PC5%-10%, EMC25%-35%, DEC 10%-15%, lithium salt is LiPF6, lithium difluorooxalate borate composite conductive Salt, concentration 10%-15%. The additives are succinonitrile, vinylene sulfate, and fluorinated hydrocarbons.

[0023] 4. The positive and negative plates of the aluminum shell power lithium-ion battery are wound, wound cores, welded cover plates, shelled, baked, laser welded, secondary baked, liquid injected, formed, pumped, presse...

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Abstract

The invention discloses a lithium iron phosphate power battery and a preparation method thereof. Secondary particle lithium iron phosphate, which is agglomerated by primary nano particles and has the D50 value of 1-3 mu m, is taken as a positive active material; a negative electrode utilizes high-interlayer-spacing synthetic graphite with an amorphous carbon coating structure; a diaphragm utilizes a high-air-permeability diaphragm with PP, PE and PP as a base material, and the air permeability is not greater than 300 s/100 ml; an electrolyte liquid comprises the following ingredients: 25-35% ethylene carbonate (EC), 5-10% propylene carbonate (PC), 25-35% ethyl methyl carbonate (EMC) and 10-15% diethyl carbonate (DEC); lithium salt is a composite conductive salt of lithium hexafluorophosphate and lithium difluoroborate, and the concentration of the lithium salt is 10-15%; and the additive comprises butanedinitrile, ethylene sulfite and fluorinated hydrocarbon. Square aluminum shell lithium-ion battery positive and negative electrode plates are subjected to treatment of winding, core-winding, cover plate welding, shelling, baking, laser welding, secondary baking, injecting, forming, air exhausting, steel ball pressing, volume dividing and 45-75 DEG C high-temperature aging for 120-24 hours at a high temperature to form the film.

Description

technical field [0001] The invention relates to an energy storage power battery, in particular to a lithium iron phosphate ion energy storage power battery. Background technique [0002] Lithium iron phosphate battery is environmentally friendly, has a long service life and is highly safe. It has a very high cost performance and thus has a very wide application prospect. [0003] Ordinary lithium iron phosphate batteries have excellent high temperature performance. People usually improve the low-temperature performance of materials by means of nanonization and other means. [0004] The specific surface area of ​​nanomaterials is too large, which will affect the manufacturing process. And affect the high temperature performance. Contents of the invention [0005] The invention improves a lithium iron phosphate battery with both high and low temperature, and aims to improve the high-temperature storage performance and low-temperature discharge performance of the lithium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M4/58
CPCH01M4/133H01M4/136H01M4/5825H01M10/0525H01M10/0567H01M10/0568H01M10/058Y02E60/10Y02P70/50
Inventor 朱冠华符泽卫吴彬杰万伟超王家涛罗开燕周京明涂雪菲易锦文叶尚云李锡力张平伟
Owner YUNNAN TIN GROUP HLDG
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