Low-temperature high-energy-density long-cycle lithium iron phosphate battery

A lithium iron phosphate battery, high energy density technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems that the use temperature is difficult to break through, limit the promotion of use, and the use environment is difficult, so as to improve stability and Cyclic, improve the overall stability, improve the effect of its own anti-interference ability

Active Publication Date: 2019-09-13
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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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 material, conductive agent and binder Made on both sides of 1.5μm metal aluminum foil, roll thickness is 148μm, roll compaction density is 2.35g / cm 3 , The slitting width is 58mm; the negative electrode sheet is made by uniformly coating a mixture of negative electrode active material, conductive agent and binder on both sides of a 5μm metal copper foil. The rolling thickness is 148μm, and the compaction density is 2.2 g / cm 3 , The slitting width is 58mm. The produced battery weighs 40.16g.

[0051] The positive electrode active material is doped lithium iron phosphate, with an average particle size of 1.5um, of which D50 is 1.5um, D90 is 5um, doped materials are 10wt% hexagonal boron n...

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 material, conductive agent and binder It is made on both sides of 2μm metal aluminum foil, the rolling thickness is 147μm, and the rolling density is 2.3g / cm 3 , The slitting width is 59mm; the negative electrode sheet is made by uniformly coating the mixture of the negative electrode active material, the conductive agent and the binder on both sides of the 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 produced battery weighs 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, doped materia...

Embodiment 3

[0058] A low-temperature, high-energy density, long-cycle lithium iron phosphate battery, comprising 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 material, conductive agent and binder It is made on both sides of 3.5μm metal aluminum foil with a rolling thickness of 150μm and a rolling density of 2.45g / cm 3 , The slitting width is 58.5mm; the negative electrode sheet is made by uniformly coating a mixture of negative active material, conductive agent and binder on both sides of a 6μm metal copper foil. The rolling thickness is 150μm, and the compaction density is rolled. 2.33g / cm 3 , The slitting width is 58.5mm. The weight of the prepared battery is 39.81g.

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

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Abstract

The invention provides a low-temperature high-energy-density long-cycle lithium iron phosphate battery. A doped lithium iron phosphate is adopted as a cathode, the average particle size is 1-5 [mu]m,wherein D50 is 0.5-5[mu]m, D90 is less than or equal to 8[mu]m, and a doped material is boron nitride and carbon fibers or carbon nanotubes; a diaphragm is a base film coated with two or more of nano-scale Al2O3, BaSO4, AlN and BN; and an electrolyte for improving high and low temperature performance is added into an electrolytic solution. The battery monomer battery cell 0.2 discharge capacity islarger than 220mAh, the cycle performance of the battery monomer battery cell is good, the capacity retention rate of the battery cell is more than 80% after the battery cell is cycled for 1500 timesin 0.5C/0.5C 100% DOD, the capacity retention rate of the battery cell at -20 DEG C is about 80%, the capacity retention rate of the battery cell at-40 DEG C 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 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 polyethylene acrylic acid. Background technique [0003] With the development of various fields, the performance requirements for batteries are also increasing, requ...

Claims

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Application Information

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Patent Type & Authority Applications(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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