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A low temperature type high energy density long cycle lithium iron phosphate battery

A lithium iron phosphate battery, high energy density technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult to break through the use temperature, difficult use environment, poor rate performance, etc., to improve the battery cycle. The effect of high stability, overall stability and safety performance, and uniform pore distribution

Active Publication Date: 2021-12-28
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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  • A low temperature type high energy density long cycle lithium iron phosphate battery
  • A low temperature type high energy density long cycle lithium iron phosphate battery
  • A low temperature type high energy density long cycle lithium iron phosphate battery

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A low-temperature, high-energy-density, long-cycle lithium iron phosphate battery, including a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and a casing; wherein, the positive electrode sheet is uniformly coated with a mixture of positive electrode active materials, conductive agents, and binders Made on both sides of 1.5μm metal aluminum foil, the rolling thickness is 148μm, and the rolling compaction density is 2.35g / c m 3 , the cutting 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 / c m 3 , The cutting width is 58mm. The mass of the prepared battery is 40.16g.

[0051] The positive electrode active material is doped lithium iron phosphate, the average particle size is 1.5um, of which D50 is 1.5um, D90 is 5um, an...

Embodiment 2

[0054] A low-temperature, high-energy-density, long-cycle lithium iron phosphate battery, including a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and a casing; wherein, the positive electrode sheet is uniformly coated with a mixture of positive electrode active materials, conductive agents, and binders Made on both sides of 2μm metal aluminum foil, the rolling thickness is 147μm, and the rolling compaction density is 2.3g / c m 3 , the cutting 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 cutting width is 59mm. The mass of the prepared battery is 40.43g.

[0055] The positive electrode active material is doped lithium iron phosphate, with an average particle size of 2.5um, of which D50 is 3um, D90 is 7um, and th...

Embodiment 3

[0058] A low-temperature, high-energy-density, long-cycle lithium iron phosphate battery, including a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and a casing; wherein, the positive electrode sheet is uniformly coated with a mixture of positive electrode active materials, conductive agents, and binders Made on both sides of 3.5μm metal aluminum foil, the rolling thickness is 150μm, and the rolling compaction density is 2.45g / c m 3 , the slitting width is 58.5mm; the negative electrode sheet is made by uniformly coating the mixture of negative 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 / c m 3 , The cutting width is 58.5mm. The mass of the obtained battery is 39.81g.

[0059] The positive electrode active material is doped lithium iron phosphate, with an average particle size of 3.5um, of which D50 is 4um, D90 is 6um, and the ...

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Abstract

The invention provides a low temperature type high energy density long cycle lithium iron phosphate battery, the positive electrode adopts doped lithium iron phosphate, the average particle size is 1-5um, wherein D50 is 0.5-5um, D90 is ≤8um, and the doping material is Boron nitride, and carbon fibers or carbon nanotubes; the diaphragm is a base film coated with nano-scale Al 2 O 3 , BaSO 4 , two or more of AlN and BN; an electrolyte that improves high and low temperature performance is added to the electrolyte. The battery cell of the present invention has a 0.2C discharge capacity of >2200mAh, excellent cycle performance, a capacity retention rate of more than 80% after 1500 cycles of 0.5C / 0.5C 100% DOD, and a capacity retention rate of ‑20° C. About 80%, the capacity retention rate at ‑40℃ is about 58%, and the thermal stability is good.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a low-temperature 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, PAni refers to Polyaniline, PAA refers to polyacrylic acid, PAALi refers to lithium polyacrylate, and PEAA refers to polyvinyl acrylic acid. Background technique [0003] With the development of various fields, the performance requirements for batteries ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/36H01M4/58H01M4/62H01M10/0587
CPCH01M10/0525H01M4/366H01M4/5825H01M4/625H01M4/628H01M10/0587Y02E60/10Y02P70/50
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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