Stabilizer for non-water electrolysis and non-water electrolysis containing the stabilizer

A non-aqueous electrolyte and stabilizer technology, applied in the field of electrolyte, can solve problems such as content increase, discoloration of non-aqueous electrolyte, poor thermal stability, etc., to prevent oxidative discoloration, stabilize non-aqueous electrolyte, and prevent excessive acidity Effect

Inactive Publication Date: 2009-03-11
广东金光高科股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, LiPF 6 Its thermal stability is poor, and it decomposes at a temperature ≥30°C to produce hydrogen fluoride (HF), so at high temperatures, the content of acids (such as HF) in the non-aqueous electrolyte will also increase
[0005] On the other hand, non-aqueous electrolytes for lithium-ion batteries contain many organic solvents, inorganic additives, and lithium salts that are easily oxidized by air or other oxidants. After these organic solvents, inorganic additives, and lithium salts are oxidized, they directly affect the non-aqueous electrolytic process. The nature of the liquid reduces the capacity, cycle life, high and low temperature performance, overcharge prevention performance and rate discharge performance of the battery, and leads to obvious discoloration of the non-aqueous electrolyte

Method used

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  • Stabilizer for non-water electrolysis and non-water electrolysis containing the stabilizer
  • Stabilizer for non-water electrolysis and non-water electrolysis containing the stabilizer
  • Stabilizer for non-water electrolysis and non-water electrolysis containing the stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of stabilizer: In a glove box with dry gas (such as air, nitrogen or argon, its moisture content is less than 20PPM), accurately weigh 4.5 grams of trimethyl phosphite and 0.5 grams of 1,1, 3,3-tetramethyl-1,3-diphenyldisilazane, and then the above 4.5 grams of trimethyl phosphite and 0.5 grams of 1,1,3,3-tetramethyl-1,3-di Add phenyldisilazane (the order of adding the above two substances is not limited) to the first dry container (conical flask can be used), and stir or vibrate to mix the above two substances evenly to obtain 5 g stabilizer. The resulting stabilizer consisted of 90% by weight of trimethyl phosphite and 10% by weight of 1,1,3,3-tetramethyl-1,3-diphenyldisilazane.

[0032] Preparation of non-aqueous electrolyte: In a glove box with a dry gas (such as air, nitrogen or argon, the moisture content of which is less than 20PPM), accurately weigh 8 grams of lithium hexafluorophosphate, 40 grams of dimethyl carbonate, and 30 grams of dimethyl carb...

Embodiment 2

[0037] The steps of the method for preparing the stabilizer and the non-aqueous electrolyte in this example are the same as those in Example 1, but the raw materials used and their proportions are different.

[0038] Preparation of a stabilizer: The raw materials used are 2.1 grams of dibutyl phosphite and 0.9 grams of heptamethyldisilazane to obtain 3 grams of a stabilizer. The resulting stabilizer consisted of 70% by weight of dibutyl phosphite and 30% by weight of heptamethyldisilazane.

[0039] Preparation of non-aqueous electrolyte: raw materials used are 20 grams of ethylene carbonate, 50 grams of ethyl acetate, 17 grams of ethyl methyl carbonate, 10 grams of lithium hexafluorophosphate, and 3 grams of the above-mentioned stabilizer. Contain in the non-aqueous electrolytic solution that makes: the organic solvent (ethylene carbonate, ethyl acetate and ethyl methyl carbonate) of 87% (weight), the lithium salt (lithium hexafluorophosphate) of 10% (weight) and 3% (weight) ...

Embodiment 3

[0044] The steps of the method for preparing the stabilizer and the non-aqueous electrolyte in this example are the same as those in Example 1, but the raw materials used and their proportions are different.

[0045] Preparation of stabilizer: The raw materials used are 0.4 g of triethyl phosphite and 0.6 g of N,N-dimethyltrimethylsilazane to prepare 1 g of stabilizer. The prepared stabilizer consisted of 40% by weight of triethyl phosphite and 60% by weight of N,N-dimethyltrimethylsilazane.

[0046] Preparation of non-aqueous electrolyte solution: raw materials used are 30 grams of ethylene carbonate, 30 grams of dimethyl carbonate, 25 grams of N,N-dimethylformamide, 14 grams of lithium hexafluorophosphate, and 1 gram of the above-mentioned stabilizer. Contain in the nonaqueous electrolytic solution that makes: the lithium salt (lithium hexafluorophosphate) of 85% (weight) organic solvent (ethylene carbonate, dimethyl carbonate and N, N-dimethylformamide), 14% (weight) and 1...

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PUM

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Abstract

The invention provides a stabilizing agent used for nonaqueous electrolytic solution, and the stabilizing agent is composed of phosphite ester compound and amine compound. The invention also provides the nonaqueous electrolytic solution containing the stabilizing agent. The nonaqueous electrolytic solution contains 85-90 percent (weight) of organic solvent, 8-14 percent (weight) of lithium salt and 0.1-5 percent (weight) of the stabilizing agent. In the stabilizing agent of the invention, the phosphite ester compound can be oxidized preferentially to play a role of protecting other effective components in the nonaqueous electrolytic solution; and the amine compound can catch active protons in the nonaqueous electrolytic solution and can restrain the decomposition of LiPF6 and reduce the HF content of electrolytic solution. The phosphite ester compound and the amine compound are matched for use to prevent the acidity of the nonaqueous electrolytic solution from being overhigh and prevent the nonaqueous electrolytic solution from being oxidized to change the color so as to well stabilize the nonaqueous electrolytic solution, thereby the nonaqueous electrolytic solution containing the stabilizing agent can keep stable for a long time.

Description

technical field [0001] The invention relates to an electrolyte solution for batteries, in particular to a nonaqueous electrolyte solution and a stabilizer for the nonaqueous electrolyte solution. The nonaqueous electrolyte solution can be used in lithium-ion batteries. 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] Non-aqueous electrolyte is an important part of lithium-ion batteries, and its stable performance is the guarantee for the normal operation of lithium-ion batteries. [0004] The solid electrolyte interface film (solid electrolyte interface, referred to as SEI film) in lithium-ion batteries plays a very important role in the capacity, cycle stability and safety of lithium-ion batteries. However, due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/0568H01M10/0569
CPCY02E60/122Y02E60/10
Inventor 林晓忠许日勤
Owner 广东金光高科股份有限公司
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