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Non-aqueous electrolyte containing fluorine-substituted succinic anhydride and succinic anhydride derivatives, and alkali metal secondary battery comprising thereof

A non-aqueous electrolyte and succinic anhydride technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor battery performance and reduced battery life, and achieve thermal runaway suppression and flame retardancy. , Good charge and discharge performance

Inactive Publication Date: 2012-01-18
SHANGHAI INST OF SPACE POWER SOURCES
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AI Technical Summary

Problems solved by technology

At present, electrolytes containing ethylene carbonate and propylene carbonate are often used in the industry. However, since ethylene carbonate (EC) is a solvent with a melting point as high as 37°C, the performance of the battery is not good at low temperatures. Propylene Carbonate (PC) is prone to co-intercalation effect with lithium ions, which will reduce battery life

Method used

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  • Non-aqueous electrolyte containing fluorine-substituted succinic anhydride and succinic anhydride derivatives, and alkali metal secondary battery comprising thereof
  • Non-aqueous electrolyte containing fluorine-substituted succinic anhydride and succinic anhydride derivatives, and alkali metal secondary battery comprising thereof
  • Non-aqueous electrolyte containing fluorine-substituted succinic anhydride and succinic anhydride derivatives, and alkali metal secondary battery comprising thereof

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preparation example Construction

[0037] Preparation of positive and negative electrodes:

[0038]The alkali metal secondary battery of the present invention includes a positive electrode sheet and a negative electrode sheet. The preparation method of the positive electrode sheet is as follows: the positive electrode slurry is 80-95% positive electrode active material, 2-15% conductive agent and 3-10% binder are dissolved in N-methyl-2-pyrrolidone (NMP) Then evenly coat it on the aluminum foil roll, the dried positive roll is rolled and cut, and finally vacuum-dried, the positive active material is vanadium, titanium, chromium, copper, molybdenum, niobium, cobalt, nickel and manganese and other metals Lithiated oxides, lithiated sulfides, lithiated selenides and organic radical polymers (Radical polymers), etc., the binder includes polyvinylidene fluoride, and the conductive agent can be carbon black, graphite powder, graphite, acetylene Black, nickel powder, aluminum powder, titanium powder, etc.

[0039] I...

Embodiment 1

[0044] Weigh LiPF6 and dissolve it in ethylene carbonate (EC), ethyl methyl carbonate (EMC) (volume ratio EC / EMC=3 / 7), prepare a 1.1mol / L LiPF6 solution, add 1% by weight of fluorobutyl The dianhydride is used as an additive, fully stirred to make it uniform, and defoamed.

Embodiment 2

[0046] Weigh LiPF6 and dissolve in ethylene carbonate (EC), ethyl methyl carbonate (EMC) (volume ratio EC / EMC=3 / 7), prepare 1.1mol / L LiPF6 solution, add 1% by weight of trifluoroform Use succinic anhydride as an additive, stir well to make it uniform, and perform defoaming.

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PUM

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Abstract

The invention relates to non-aqueous electrolyte containing fluorine-substituted succinic anhydride and succinic anhydride derivatives, and an alkali metal secondary battery comprising the non-aqueous electrolyte. The non-aqueous electrolyte comprises: electrolyte of alkali metal salt, a non-aqueous solvent, and an additive containing fluorine-substituted succinic anhydride or fluorine-substituted succinic anhydride derivatives, wherein the additive is any one or a combination of more than two selected from fluorine-substituted succinic anhydride and fluorine-substituted succinic anhydride derivatives. According to the invention, the secondary battery manufactured with the non-aqueous electrolyte has good charging and discharging efficiencies, good electrochemical stability, good thermal stability, and overcharge protection property. The flexibility of the application is high, and the application scope is wide.

Description

technical field [0001] The invention relates to a secondary battery, in particular to a nonaqueous electrolytic solution containing fluorine-substituted succinic anhydride and succinic anhydride derivatives and an alkali metal secondary battery containing the same. Background technique [0002] With the development of portable electronic products and the development of electric vehicles and power storage systems, the requirements for power supply are getting higher and higher. In terms of power supply, it is required to be used for a long time, light in weight, good in stability and high in safety. In addition, facing the problem of clean energy in the 21st century, the development of new batteries will play a very important role. Due to the advantages of high voltage, high energy density, and long storage time, lithium-ion batteries are highly praised by all walks of life. However, lithium-ion batteries have advantages such as high energy density, but they also have some d...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569
CPCY02E60/12Y02E60/10
Inventor 戴扬高蕾解晶莹蔡森丹杨炜婧
Owner SHANGHAI INST OF SPACE POWER SOURCES
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