Novel electrolyte of lithium-ion battery and preparation method thereof

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems affecting battery high temperature performance, battery cycle performance, battery system performance, etc., to increase the infiltration effect and improve the platform Effect of improving efficiency and high-temperature discharge performance

Inactive Publication Date: 2013-04-10
DONGUAN KAIXIN BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of DMC may affect the performance of individual battery systems, for example, in pouch batteries, the high temperature performance of the battery is more or less affected
The addition of wetting additives will affect the cycle performance of the battery or increase the cost of the electrolyte

Method used

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  • Novel electrolyte of lithium-ion battery and preparation method thereof
  • Novel electrolyte of lithium-ion battery and preparation method thereof
  • Novel electrolyte of lithium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] An electrolyte solution for a lithium-ion battery. Under the condition that the negative electrode sheet of the lithium-ion battery is compressed under high pressure, the electrolyte solution for the lithium-ion battery is composed of 75% to 85% of organic solvent and 10% of lithium salt. ~15%, the additive is 5%~10%, and described additive comprises an organic compound, can form good SEI film in battery, and wherein, the structural formula of this organic compound is expressed as:

[0024]

[0025] The added amount of the organic compound is 0.1%-3% of the total weight. Among them, the three substituent groups of R1, R2, and R3 cannot be hydrogen atoms at the same time, and R1, R2, and R3 can be fluorine atoms, benzene rings, alkane with less than 4 carbon atoms or alkane groups with perfluorinated bands.

[0026] In this embodiment, the organic compound is m-fluoromethyl-s-triazine, which accounts for 1% of the total weight.

[0027] The organic solvents include: ...

Embodiment 2

[0035] The difference between the second embodiment and the first embodiment is that the organic compound is trifluoroethyl-s-triazine, which accounts for 1% of the total weight.

[0036] The organic solvent is a mixture composed of ethylene carbonate (EC), diethyl carbonate (DEC) and methyl ethyl carbonate (EMC), wherein the weight percentage between them is 1:1:1 , accounting for 82.5% of the total weight of the electrolyte; the lithium salt is lithium hexafluorophosphate (LiPF 6 ), accounting for 12.5% ​​of the total weight of the electrolyte; the additives include vinylene carbonate (VC) and trifluoroethyl-s-triazine, which account for 4% and 1% of the total weight respectively.

[0037] The preparation method of the lithium-ion battery electrolyte in the second embodiment is the same as the preparation method in the first embodiment above, and will not be repeated here.

[0038]The trifluoroethyl-s-triazine can form a good SEI film with additives such as vinylene carbona...

Embodiment 3

[0040] The difference between the third embodiment and the first embodiment above is that the organic compound is bis-perfluoroethane-s-triazine, which accounts for 3% of the total weight.

[0041] The organic solvent is a mixture composed of ethylene carbonate (EC), diethyl carbonate (DEC), and methyl ethyl carbonate (EMC), wherein the weight percentage between them is 1:1:1, accounting for 81.5% of the total weight of the liquid; the lithium salt is lithium hexafluorophosphate (LiPF 6 ), accounting for 12.5% ​​of the total weight of the electrolyte; additives include vinylene carbonate (VC), bis-perfluoroethane-s-triazine and propane sultone (PS), which accounted for 2% and 3% of the total weight, respectively and 1%.

[0042] The preparation method of the lithium-ion battery electrolyte in the third embodiment is the same as that in the first embodiment above, and will not be repeated here.

[0043] The bisperfluoroethane-s-triazine can form a good SEI film with additives...

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Abstract

The invention discloses novel electrolyte of a lithium-ion battery and the preparation method thereof. When the negative pole piece of the lithium-ion battery is in a high voltage state, the electrolyte comprises the following raw material components by weigh percentage: 75 to 85 percent of organic solvent, 10 to 15 percent of lithium salt and 5 to 10 percent of additive, wherein the additive comprises an organic compound, which can form a good SEI (Solid Electrolyte Interface) film in the battery; and the amount of the added organic compound is 0.1 to 3 percent of the total weight. The preparation method comprises the following steps: a, providing a glove box filled with argon, of which the concentration of H2O is less than 100 ppm; b, weighing the organic solvent, the lithium salt and the additive according to corresponding weight; and c, adding the organic solvent, the lithium salt and the additive into the glove box sequentially, and then stirring sufficiently and uniformly to obtain the electrolyte of the lithium-ion battery. According to the invention, after the organic compound is added, the infiltration effect of the electrolyte to high voltage real negative pole material is improved, and in addition, a good SEI film can be formed by the electrolyte to improve the stability of the electrolyte.

Description

Technical field: [0001] The invention relates to the field of battery electrolyte technology, in particular to a method that can increase the infiltration effect of the electrolyte on the high-pressure negative electrode material under the high-pressure compaction of the negative electrode sheet of the lithium-ion battery, and can form a good SEI film to improve A novel lithium-ion battery electrolyte and a preparation method thereof for the stability of the electrolyte. Background technique: [0002] The rapid development of lithium-ion battery technology has prompted the diversity of positive electrodes, negative electrodes, electrolytes, and diaphragm materials. For example, Japanese lithium batteries use lithium titanate as the negative electrode in batteries, and Korean lithium batteries dope high-capacity silicon alloys into negative electrode materials to increase the energy density of lithium-ion batteries. At present, among the positive and negative electrode mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCY02E60/10
Inventor 仰永军
Owner DONGUAN KAIXIN BATTERY MATERIAL
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