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High-energy-density long-cycle lithium iron phosphate battery

A lithium iron phosphate battery, high energy density technology, applied in the direction of lithium batteries, secondary batteries, battery electrodes, etc., can solve the problems of difficult to break through the use temperature, difficult use environment, poor rate performance, etc., to achieve relief materials Effects of volume change, reduced continuous decomposition, and improved rate performance

Active Publication Date: 2019-10-22
江西省汇亿新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods to improve the low-temperature performance of lithium iron phosphate batteries mainly focus on reducing the particle size of positive and negative electrode materials and optimizing the low-temperature electrolyte.
At present, the main method to solve the low-temperature performance of lithium iron phosphate battery is to use low-melting point solvent electrolyte and nanometerization of positive and negative electrode materials, which improves the low-temperature performance of lithium iron phosphate battery to a certain extent, but its operating temperature is still difficult to break through -20 ℃ , which greatly limits its promotion and use

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0057] A high-energy density long-cycle lithium iron phosphate battery, comprising a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte and an outer casing; wherein, the positive electrode sheet is a mixture composed of a positive electrode active material, a conductive agent and a binder uniformly coated on 1.5 Made of μm metal aluminum foil on both sides, the rolling thickness is 148 μm, and the rolling compaction density is 2.35 g / cm m 3 , the slitting width is 58mm; the negative electrode sheet is made by uniformly coating the mixture of negative electrode active material, conductive agent and binder on both sides of 5μm metal copper foil, the rolling thickness is 148μm, and the rolling compaction density is 2.2 g / cm 3 , the slitting width is 58mm. The mass of the obtained battery is 39.86g.

[0058] The positive electrode active material is lithium iron phosphate doped with vanadium, boron, nitrogen and carbon elements, and its structure i...

Embodiment 2

[0061] A high-energy density long-cycle lithium iron phosphate battery, comprising a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte and an outer shell; wherein, the positive electrode sheet is a mixture composed of a positive electrode active material, a conductive agent and a binder uniformly coated on a 2 μm surface. It is made of metal aluminum foil on both sides, the rolling thickness is 147μm, and the rolling compaction density is 2.3g / cm 3 , the slitting width is 59mm; the negative electrode sheet is made by uniformly coating the mixture of negative electrode active material, conductive agent and binder on both sides of 6.5μm metal copper foil, the rolling thickness is 149μm, and the rolling compaction density 2.3g / cm 3 , the slitting width is 59mm. The mass of the obtained battery is 40.24g.

[0062] The positive electrode active material is lithium iron phosphate doped with vanadium, boron, nitrogen and carbon elements, and its stru...

Embodiment 3

[0065] A high-energy density long-cycle lithium iron phosphate battery, comprising a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte and an outer shell; wherein, the positive electrode sheet is a mixture composed of a positive electrode active material, a conductive agent and a binder uniformly coated on 3.5 Made of μm metal aluminum foil on both sides, the rolling thickness is 150 μm, and the rolling compaction density is 2.45g / cm m 3 , the slitting width is 58.5mm; the negative electrode sheet is made by uniformly coating the mixture of negative electrode active material, conductive agent and binder on both sides of 6μm metal copper foil, the rolling thickness is 150μm, and the rolling compaction density 2.33g / cm 3 , the slitting width is 58.5mm. The mass of the obtained battery is 40.18g.

[0066] The positive electrode active material is lithium iron phosphate doped with vanadium, boron, nitrogen and carbon elements, and its structure is...

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Abstract

The invention provides a high-energy-density long-cycle lithium iron phosphate battery. Lithium iron phosphate doped with vanadium, boron, nitrogen and carbon doped is used as a positive active material, doped carbon nanotubes and / or carbon fibers are used as a negative conductive agent, a base membrane is coated with nanoscale TiO2 and BN to form a diaphragm, and a novel lignin binder is used asa binder. According to the invention, 0.2 C discharge capacity of the battery cell of the single battery is greater than or equal to 2300mAh; the cycle performance is excellent; the capacity retentionratio is 78% or above after 1000 times of 0.5 C / 0.5 C 100% DOD cycles of the battery cell; the capacity retention ratio at -20 DEG C is about 83%; the capacity retention ratio at -40 DEG C is about 63%; and the low-temperature use performance is good.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high energy density long cycle lithium iron phosphate battery. [0002] Professional terms: CNT refers to carbon nanotubes, PVDF refers to polyvinylidene fluoride, GR refers to graphite, CF refers to carbon fiber, Super P refers to conductive carbon black, SBR refers to styrene-butadiene rubber, CMC refers to hydroxymethyl cellulose, PE refers to polyethylene, EC refers to ethylene carbonate, PC refers to propylene carbonate, DEC refers to diethyl carbonate, DMC refers to dimethyl carbonate, PTFE refers to polytetrafluoroethylene, NMP refers to N-methylpyrrolidone, VC refers to vinylene carbonate, Na 2 ATP refers to disodium adenosine triphosphate, PAni refers to polyaniline, PAA refers to polyacrylic acid, PAALi refers to lithium polyacrylate, and PEAA refers to polyethylene acrylic acid. Background technique [0003] With the development of various fields, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/04H01M4/136H01M4/1397H01M4/36H01M4/58H01M4/62H01M10/0566H01M10/0587H01M10/42
CPCH01M4/0435H01M4/136H01M4/1397H01M4/362H01M4/5825H01M4/622H01M4/625H01M10/052H01M10/0566H01M10/0587H01M10/4235Y02E60/10Y02P70/50
Inventor 廖宗江江涛邹晓兵
Owner 江西省汇亿新能源有限公司
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