Lithium iron phosphate battery with lithium ion battery electrolyte suitable for ultralow-temperature charging and discharging

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as restricting the use of lithium iron phosphate batteries, and achieve fast migration, improve stability, and improve ionic conductivity. Effect

Active Publication Date: 2013-10-23
HANGZHOU LIAO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, there is currently no lithium iron phosphate battery capable of ultra-low temperature discharge, low temperature charge, and high temper

Method used

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  • Lithium iron phosphate battery with lithium ion battery electrolyte suitable for ultralow-temperature charging and discharging
  • Lithium iron phosphate battery with lithium ion battery electrolyte suitable for ultralow-temperature charging and discharging
  • Lithium iron phosphate battery with lithium ion battery electrolyte suitable for ultralow-temperature charging and discharging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Disperse the lithium iron phosphate active material, the binder polyvinylidene fluoride, and the conductive agent in a solvent (N-methyl-2-pyrrolidone) according to a weight ratio of 92.5:4.5:3 to form a positive electrode slurry, and the above slurry The material is coated on a 15um thick aluminum foil, dried and rolled to form a positive electrode. The artificial graphite and the conductive agent are dispersed in the aqueous solution of sodium carboxymethylcellulose (CMC) according to the weight ratio of 98:2, and the binder is added Styrene-butadiene rubber (SBR) is used to form the negative electrode slurry, which is coated on a 9um thick copper foil, dried and rolled to form the negative electrode. The positive electrode, negative electrode and polyethylene or polypropylene separator with a thickness of 25um are wound or laminated to form a battery core, and then the resulting battery core is put into a steel case, an aluminum case or an aluminum-plastic composite f...

Embodiment 2

[0030] Example 1 was repeated except that 8% methyl acetate (MA) was added to the quaternary solvent as a low melting point additive and 1% 1,3-propane sultone was added as a high temperature additive.

Embodiment 3

[0032] Example 1 was repeated except that 5% of ethyl butyrate (EB) as a low melting point additive and 1% of 1,3-propane sultone as a high temperature additive were added to the quaternary solvent.

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Abstract

The invention relates to a lithium iron phosphate battery with lithium ion battery electrolyte suitable for ultralow-temperature charging and discharging. The lithium ion battery electrolyte comprises lithium salt, a multi-element organic solvent and additives, wherein the additives comprise a low-melting-point additive, a film forming additive and a high-temperature additive; the multi-element organic solvent contains at least three of ethylene carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, propylene carbonate and butylene carbonate; the low-melting-point additive contains at least one of 4-methyl-1,3-dioxolane, methyl acetate, methyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate and butyl acetate; the high-temperature additive is at least one of methyl ester, di-n-propyl carbonate and 1,3-propane sultone. The lithium iron phosphate battery with the electrolyte can charge and discharge at an ultralow temperature and in a high-temperature environment, and is stable in performance and long in recycling life.

Description

technical field [0001] The invention relates to an electrolyte solution of a lithium ion battery and a lithium iron phosphate battery thereof, in particular to an electrolyte lithium iron phosphate battery capable of ultra-low temperature charge and discharge while taking into account high temperature performance. Background technique [0002] At present, the positive electrode of commercial lithium iron phosphate batteries uses lithium iron phosphate materials, and the negative electrode uses carbon materials, such as graphite, mesocarbon microspheres (MCMB), etc., and the electrolyte generally uses non-aqueous organic solvents dissolved in lithium salts. As an important part of the battery, the electrolyte plays the role of transporting lithium ions and conducting current between the positive and negative electrodes. The organic solvents widely used in lithium-ion battery electrolytes are as follows: diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 黄镇财
Owner HANGZHOU LIAO TECH
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