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Lithium battery electrolyte additive and preparation method and application thereof

An electrolyte additive and lithium battery technology, which is applied in the field of lithium batteries, can solve problems such as consumption, and achieve the effects of improving safety performance, improving Coulombic efficiency, and good flame retardant and explosion-proof effects

Active Publication Date: 2021-07-16
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

When the existing electrolyte system forms the SEI film, the lithium salt in the solvent will be consumed to form an SEI film with a thick alkyl lithium as the main component that is not conducive to the passage of lithium ions.

Method used

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  • Lithium battery electrolyte additive and preparation method and application thereof
  • Lithium battery electrolyte additive and preparation method and application thereof
  • Lithium battery electrolyte additive and preparation method and application thereof

Examples

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preparation example Construction

[0041] (1) Preparation of lithium battery electrolyte additive M1

[0042] Under N2 protection, 0.5 mol of ethylene glycol and equimolar trichloride were placed in three bottles, and 10 ml of carbon chloride is a solvent, stirred at 4 ° C for 2 h, first using a water pump to distillation solvent, The oil pump was rehydrated by oil pump, and the A1 and equimolar thiol chloride were added to the three flask under N2, and 20 ml of carbon tetrachloride and 10 ml of carbon tank were added as a solvent, reacted at 90 ° C for 3 h. Decondition distillation A2; in N 2 Under the protection, the A2 was added to the three flasks, and the equimolar triethylamine and 50 mL of dimethyl carbonate were added, and the mixed solution was reacted at 45 ° C for 5 h, filtered, filtrate to remove the solvent A3; in n 2 Under the protection, A3, equimolar 3,3,3-trifluorolactate and 30 ml of acetonitrile were added to the three flavor, stirred at 50 ° C for 3 h, filtration, and wash three times with N, N-...

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Abstract

The invention provides a lithium battery electrolyte additive. The lithium battery electrolyte additive is one or a mixture of two of a cyclic phosphate ester compound and a cyclic phosphite ester compound, when the lithium battery electrolyte additive is applied to the lithium battery electrolyte, the electrolyte has a film forming effect on the surface of an electrode, so that the cycle performance of the lithium battery can be effectively improved. The invention also provides a preparation method of the lithium battery electrolyte additive, the preparation process is simple, the preparation environment requirement is low, and the production cost can be effectively reduced.

Description

Technical field [0001] The present invention relates to the technical field of lithium battery electrolyte, and more particularly to a lithium battery electrolyte additive and a preparation method thereof, an electrolyte containing the additive and a lithium battery containing the electrolyte. Background technique [0002] With the improvement of people's environmental awareness, clean energy replacement of fossil energy has become a trend of social development, electric vehicles, and hybrid vehicles are widely concerned by R & D staff. The lithium battery has the advantages of high energy density, high voltage, number of cycles, long storage time, and is widely used in various aspects such as electric vehicles, energy storage power stations, drones, portable equipment. [0003] In the case where the first charge is first charged in a lithium ion battery, the electrolytic liquid can form a layer of passivation layer on the surface of the electrode, and the layer of passivation la...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/052
CPCH01M10/0567H01M10/4235H01M10/052H01M2300/0025Y02E60/10
Inventor 李振超俞会根
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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