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Non-aqueous electrolyte for lithium iron phosphate battery

A technology of lithium iron phosphate battery and non-aqueous electrolyte, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of poor low-temperature performance and compatibility, and achieve the goal of improving conductivity, service life, and compatibility Effect

Active Publication Date: 2014-05-07
广东金光高科股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor low temperature performance of lithium iron phosphate battery and the compatibility between electrolyte and lithium iron phosphate positive electrode, and provide a non-aqueous electrolyte for lithium iron phosphate battery

Method used

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  • Non-aqueous electrolyte for lithium iron phosphate battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of non-aqueous electrolyte: at room temperature, in a glove box with dry air (moisture <20PPM), accurately weigh 26.98 grams of ethylene carbonate, 26.98 grams of dimethyl carbonate, and 26.98 grams of ethyl methyl carbonate with an electronic balance , 1.5 grams of vinylene carbonate, 2 grams of 1,3-propane sultone, 3 grams of fluoroethylene carbonate, 0.01 grams of hexamethyldisilazane, 0.05 grams of trimethyl phosphite and 12.50 grams of lithium hexafluorophosphate; Then, the above-mentioned various raw materials were added into a Erlenmeyer flask with a ground mouth, and stirred until the lithium hexafluorophosphate was completely dissolved, and the organic solvents were evenly mixed to obtain 100 grams of non-aqueous electrolyte.

Embodiment 2

[0042] The preparation method of this example is the same as Example 1, except that the raw materials used are 27.12 grams of ethylene carbonate, 27.12 grams of dimethyl carbonate, 27.12 grams of diethyl carbonate, 2.00 grams of vinyl vinylene carbonate, 1,4-butane 2.00 grams of sultone, 2.00 grams of fluoroethylene carbonate, 0.02 grams of heptamethyldisilazane, 0.12 grams of trimethyl phosphite and 12.50 grams of lithium hexafluorophosphate.

Embodiment 3

[0044] The preparation method of this embodiment is the same as that of Example 1, except that the raw materials used are 24.40 grams of ethylene carbonate, 24.40 grams of dimethyl carbonate, 24.40 grams of ethyl methyl carbonate, 8.15 grams of propylene carbonate, 1.00 grams of vinyl vinylene carbonate, 2.00 g of 1,3-propane sultone, 2.00 g of bisfluoroethylene carbonate, 0.01 g of heptamethyldisilazane, 0.14 g of triphenyl phosphite and 13.50 g of lithium hexafluorophosphate.

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Abstract

The invention discloses a non-aqueous electrolyte for a lithium iron phosphate battery. The non-aqueous electrolyte comprises 70 to 85 weight percent of carbonic ester compound, 3 to 20 weight percent of various function additives and 11 to 17 weight percent of lithium hexafluorophosphate, wherein the carbonic ester compound is one of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate and diethyl carbonate or a mixture of more of the ethylene carbonate, the propylene carbonate, the butylene carbonate, the dimethyl carbonate and the diethyl carbonate; and the additives comprise one of 0.5 to 10 percent of film-forming additive, 0.5 to 10 percent of high-temperature additive, 0.5 to 10 percent of low-temperature additive, 0.5 to 10 percent of overcharge-preventing additive and 0.001 to 2 percent of stability additive, and a mixture of more of the additives. The non-aqueous electrolyte for the lithium iron phosphate battery has the advantages that the solubility and dissociation of the lithium hexafluorophosphate are improved, and electric conductivity is improved; the low temperature resistance of a solid electrolyte interphase (SEI) is reduced; the overall stability of the battery is improved, the overall service life of the battery is prolonged, the compatibility of an electrolyte and a cathode is improved, circulation of the battery is improved, and the service life is prolonged; and the non-aqueous electrolyte can have high performance at high temperature.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium ion battery, in particular to a nonaqueous electrolyte solution for a lithium ion battery using lithium iron phosphate as a positive electrode material. Background technique [0002] Lithium-ion batteries have been widely used in notebook computers, mobile phones, digital cameras, mp3 players and other small electronic equipment and medical equipment as driving power sources due to their superior performance since their birth and commercialization. [0003] In recent years, lithium iron phosphate materials have been widely used in power batteries because of their good safety performance, very good cycle performance, environmental protection and no pollution. However, lithium iron phosphate also has disadvantages, that is, low conductivity, especially low-temperature conductivity, which seriously affects the low-temperature performance of the battery. In response to this shortcoming, major ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 许日勤
Owner 广东金光高科股份有限公司
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