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Electrolyte of lithium ion battery containing propylene carbonate and its preparing method

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of lower initial battery capacity, large irreversible capacity, and poor cycle performance.

Inactive Publication Date: 2008-12-17
北京中润恒动电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of adding additives can inhibit the co-intercalation of propylene carbonate (PC) and lithium ions to the graphite electrode to a certain extent, when the content of propylene carbonate (PC) is high, a large amount of carbon dioxide will be generated during the initial cycle. The irreversible capacity of the battery leads to a significant reduction in the initial capacity of the battery and poor cycle performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] According to the present invention, the battery electrolyte containing propylene carbonate (PC) can be normally used in lithium-ion batteries by injecting electrolytes with different carbonates as solvents in two or more times. The present invention also provides a preparation method and a use method of the aforementioned electrolyte composition, comprising the steps of:

[0015] mixing the cyclic carbonate solvent and the linear carbonate solvent in a mass ratio range of 1:1.5 to 1:3, and performing purification treatment for removing impurities and water to obtain the first solvent;

[0016] Dissolving the conductive lithium salt in the first solvent at a concentration of 0.8-1.5 mol / L at room temperature, and stirring evenly, to prepare the first electrolyte;

[0017] The conductive lithium salt is dissolved in the second dissolved propylene carbonate (PC) at a concentration of 0.8-1.5 mol / L to obtain the second electrolytic solution.

[0018] Inject the first elect...

Embodiment 1

[0032] Battery

[0033] 92% (by weight) of lithium cobaltate is used as the positive electrode active material. Adopt the PVDF of 4% (weight) as binder, 2% (weight) acetylene black as conductive agent, the NMP of surplus as solvent, stir 0.2-10 hour under the speed of 300-6000rpm, make it fully mix, And use aluminum foil as the current collector. Then coating, drying, and tableting are carried out, in which the three processes of mixing, coating, and drying need to be carried out in a vacuum environment, and the pressed sheet is cut into a specified size to obtain a positive electrode sheet.

[0034] 92% (weight) of carbon powder and 2% (weight) of acetylene black are used as conductive agents, and the remaining NMP is used as solvent and stirred and mixed evenly, then coated, dried, and pressed into tablets. After the size of the negative electrode sheet is made. All of the examples and comparative examples used the same positive and negative plates.

[0035] The diaphrag...

Embodiment 2

[0045] The cyclic carbonate solvent ethylene carbonate (EC), the linear carbonate solvent dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) were mixed in a mass ratio of 1:2:1.5, and used 4A molecular sieve and activated carbon are used to purify and remove impurities and water to obtain the first solvent;

[0046] At room temperature, the conductive lithium salt LiPF was added at a concentration of 1.0 mol / L 6 Dissolve in the above-mentioned first solvent, and stir evenly to form the first electrolyte;

[0047] Conductive lithium salt LiPF at a concentration of 1mol / L 6 Dissolve in a solvent that is all propylene carbonate (PC) as the second solvent, stir evenly, and make the second electrolyte;

[0048] Inject the first electrolyte into the battery to precharge the battery, and the injection volume of the first electrolyte is 80% of the total injection volume of the battery;

[0049] After injecting the first electrolyte, inject the second electrolyte into the bat...

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PUM

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Abstract

The provided electrolyte compound for Li+ cell comprises the first electrolyte with the first solvent composed by cyclic carbonate solvent and linear carbonate solvent by mass rate as 1:1.5~1:3 and the conductive Li salt dissolved in the solvent with concentration as 0.8~1.5mol / L, and the second electrolyte with PC as the second solvent and the conductive Li salt dissolved in the solvent with concentration as 0.8~1.5mol / L. this invention can increase the PC content in the electrolyte effectively and then improves cell performance.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to an electrolyte of a lithium ion battery containing propylene carbonate (PC) and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become a research hotspot in the field of new energy due to their high operating voltage, high energy density, and low environmental pollution. With the continuous development of commercialization of lithium-ion batteries, research on improving the cycle performance, high and low temperature performance and safety performance of lithium-ion batteries has attracted much attention. The electrolyte system, which is an important component of lithium-ion batteries, has also undergone continuous development. Whether it is electrolyte lithium salts, new organic solvents or electrolyte additives, research has been going on. [0003] At present, the most widely used non-aqueous liquid electrolyte in commercial lithium-ion batteries...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M6/16H01M10/0525H01M10/0569
CPCH01M10/0525Y02E60/10
Inventor 刘立君孙志华侯家军马振忠
Owner 北京中润恒动电池有限公司
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