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
CN104393331AInactive Publication Date: 2015-03-04YUNNAN TIN GROUP HLDG
4 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YUNNAN TIN GROUP HLDG
Publication Date
2015-03-04
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More