Electrolyte solution of lithium ion power battery and application

A power battery and electrolyte technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve problems such as poor cycle performance and rapid loss of lithium-ion battery capacity, and achieve improved high temperature resistance, excellent cycle performance, and improved stability sexual effect

Inactive Publication Date: 2013-12-04
万向电动汽车有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide an electrolyte solution for a lithium-ion power battery with a high capacity retention rate and good cycle perfor...

Method used

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  • Electrolyte solution of lithium ion power battery and application
  • Electrolyte solution of lithium ion power battery and application

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Preparation of electrolyte: Mix ethylene carbonate, propylene carbonate, ethyl methyl carbonate, and diethyl carbonate in a volume ratio of 5:1:8:8, and then add vinylene carbonate, propylene sulfite, and butyl Dinitrile, heated at 55°C to dissolve it, add electrolyte lithium hexafluorophosphate to it and prepare an electrolyte solution with a concentration of 1.3mol / L; the weight percentage of the single component of the additive in the entire electrolyte solution is: vinylene carbonate 2%, Propylene sulfite 1%, succinonitrile 1%.

[0020] Preparation of positive electrode: Dissolve 95 grams of polyvinylidene fluoride (Atofina, 761#PVDF) in 1425 grams of N-methyl-2-pyrrolidone (NMP) solvent to prepare a binder solution, and then add to the solution Add 2650 grams of lithium iron phosphate (Ningbo Intervital New Materials Co., Ltd.), mix well to prepare a positive electrode slurry, and apply the positive electrode slurry evenly on a 20 μm aluminum foil, dry it at 130 ° ...

Embodiment 2

[0024] Electrolyte preparation: Mix ethylene carbonate, propylene carbonate, ethyl methyl carbonate, and diethyl carbonate in a volume ratio of 8:1:6:5, and add vinylene carbonate, propylene sulfite, and butanediol to it. Nitrile, heated at 50°C to dissolve it, and then add electrolyte lithium hexafluorophosphate to it to form an electrolyte solution with a concentration of 1mol / L; the weight percentage of the single component of the additive in the entire electrolyte solution is: vinylene carbonate 1%, sub Propylene sulfate 0.5%, succinonitrile 2%.

[0025] According to the same method as in Example 1, a lithium-ion power battery with a capacity of 10Ah was prepared using the electrolyte solution prepared in this example.

Embodiment 3

[0027] Electrolyte preparation: Mix ethylene carbonate, propylene carbonate, ethyl methyl carbonate, and diethyl carbonate in a volume ratio of 10:1:5:3, and add vinylene carbonate, propylene sulfite, and butanediol to it. Nitrile, heated at 60°C to dissolve it, and then add electrolyte lithium hexafluorophosphate to it to form an electrolyte solution with a concentration of 1.5mol / L; the weight percentage of the single component of the additive in the entire electrolyte solution is: vinylene carbonate 4%, Propylene sulfite 2%, succinonitrile 0.5%.

[0028] According to the same method as in Example 1, a lithium-ion power battery with a capacity of 10Ah was prepared using the electrolyte solution prepared in this example.

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Abstract

The invention relates to an electrolyte solution of a lithium ion power battery and the lithium ion power battery containing the electrolyte solution. The electrolyte solution comprises an electrolyte and an organic solvent, and also comprises an additive. The additive consists of the following components based on the total weight of the electrolyte solution, 1-4% of vinylene carbonate, 0.5-2% of propylene sulfite and 0.5-2% of butanedinitrile. The electrolyte solution has four solvent systems, so that the electrolyte has appropriate dielectric constant and viscosity; by adding three functional additives, a compact stable SEI film is formed, and also the high-temperature SEI film is improved in stability at a high temperature, and thus the high temperature resistance of the electrolyte solution is improved; the electrolyte solution has a salt density of 1-1.5 mol/L and higher electrolyte solution conductivity, and is capable of effectively improving multiplying power and power characteristics of a lithium iron phosphate power battery; and the lithium ion power battery has high capacity conservation rate and capacity restoration ratio and good cycle performance when stored at a high temperature.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte solution of a lithium-ion power battery and its application. Background technique [0002] Due to the advantages of high energy density, high working voltage, long cycle life, high power, and environmental friendliness, lithium-ion batteries have become a hot research topic in the field of new energy. With the rapid development of lithium-ion batteries and the demand for large-capacity lithium-ion batteries for electric vehicles, it is urgent to develop lithium-ion power batteries with high safety, high capacity, high power, long life and environmental protection. Lithium iron phosphate power battery has the advantages of high working voltage, high specific capacity, long cycle life, low price and environmental friendliness, and gradually occupies a dominant position in the lithium-ion power battery market. [0003] As an important part of the ba...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0567H01M10/056H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 严红陈军高地
Owner 万向电动汽车有限公司
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