Lithium-ion battery electrolyte with high fire retardant and electrochemical properties and preparation method thereof

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion battery electrolyte and its preparation, can solve the problems of inability to use an ultrasonic heat sealing process, potential safety hazards, easy thermal runaway, etc., so as to achieve excellent battery performance and improve safety. , the effect of excellent performance

Inactive Publication Date: 2016-08-17
HENAN FAENLAITE NEW ENERGY SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current lithium-ion battery electrolyte mainly uses carbonate organic compounds as solvents. These solvents have a very low flash point, which makes the electrolyte extremely flammable. When the battery is in a harsh environment or abused, it is easy to cause thermal runaway and cause an explosion.
[0004] Chinese patent document CN102002205A, "Flame-retardant and heat-resistant materials for battery tanks and its preparation method", discloses a halogen-containing flame-retardant ABS, which greatly limits its application in the field of lithium batteries due to the inability to use ultrasonic heat-sealing te...

Method used

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Examples

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Effect test

Embodiment 1

[0022] The lithium-ion battery electrolyte with high flame retardancy and electrochemical performance of the present embodiment includes solvent, lithium salt, flame retardant and additive; the additive is difluoropropylene carbonate, difluoroethylene carbonate, monofluoro One or more of methyl acetate, ethyl trifluoroacetate, ethyl monofluoroacetate, phenyl vinylene carbonate, difluoropropylene carbonate, difluoroethylene carbonate, methyl monofluoroacetate species; the solvent is one or more of carbonates, carboxylates, ethers, fluorocarbonates, fluorocarboxylates, and fluoroethers; the lithium salt is LiPF 6 、LiBF 4 , LiBOB, LiODFB, LiCF 3 SO 3 , LiN(CF 3 S0 2 ) 2 , LiN(C 2 f 5 S0 2 ) 2 One or more of them; the flame retardant is phosphorus-nitrogen compound and halogenated phosphoric acid ester, halogenated phosphoric acid ester fluorophosphate or alkyl phosphoric acid ester; the dosage of lithium salt is 0.8mol / L, and the The amount of the flame retardant accoun...

Embodiment 2

[0027] The lithium-ion battery electrolyte with high flame retardancy and electrochemical performance of the present embodiment includes solvent, lithium salt, flame retardant and additive; the additive is difluoropropylene carbonate, difluoroethylene carbonate, monofluoro One or more of methyl acetate, ethyl trifluoroacetate, ethyl monofluoroacetate, phenyl vinylene carbonate, difluoropropylene carbonate, difluoroethylene carbonate, methyl monofluoroacetate species; the solvent is one or more of carbonates, carboxylates, ethers, fluorocarbonates, fluorocarboxylates, and fluoroethers; the lithium salt is LiPF 6 、LiBF 4 , LiBOB, LiODFB, LiCF 3 SO 3 , LiN(CF 3 S0 2 ) 2 , LiN(C 2 f 5 S0 2 ) 2 one or more of them; the flame retardant is phosphorus-nitrogen compound and halogenated phosphoric acid ester, halogenated phosphoric acid ester fluorophosphate or alkyl phosphoric acid ester; the dosage of lithium salt is 1mol / L, and the flame retardant The consumption of fuel ac...

Embodiment 3

[0032] The lithium-ion battery electrolyte with high flame retardancy and electrochemical performance of the present embodiment includes solvent, lithium salt, flame retardant and additive; the additive is difluoropropylene carbonate, difluoroethylene carbonate, monofluoro One or more of methyl acetate, ethyl trifluoroacetate, ethyl monofluoroacetate, phenyl vinylene carbonate, difluoropropylene carbonate, difluoroethylene carbonate, methyl monofluoroacetate species; the solvent is one or more of carbonates, carboxylates, ethers, fluorocarbonates, fluorocarboxylates, and fluoroethers; the lithium salt is LiPF 6 、LiBF 4 , LiBOB, LiODFB, LiCF 3 SO 3 , LiN(CF 3 S0 2 ) 2 , LiN(C2 f 5 S0 2 ) 2 One or more of them; the flame retardant is phosphorus-nitrogen compound and halogenated phosphoric acid ester, halogenated phosphoric acid ester fluorophosphate or alkyl phosphoric acid ester; the amount of lithium salt is 1.2mol / L, the The amount of the flame retardant accounts for...

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Abstract

The invention discloses lithium-ion battery electrolyte with high fire retardant and electrochemical properties and a preparation method thereof. The lithium-ion battery electrolyte contains a solvent, lithium salt, a fire retardant and additives. The preparation method comprises the following steps: S1, dissolving the lithium salt into an organic solvent to obtain electrolyte with the concentration of 0.8-1.2mol/L; and S2, adding the fire retardant and additives to obtain fire retardant electrolyte, wherein the mass percentage content of the fire retardant accounts for 10-50% of the total mass of the fire retardant electrolyte, and the usage amount of the additive accounts for 1-10% of the total mass of the electrolyte. The lithium-ion battery electrolyte with high fire retardant and electrochemical properties has the advantages that the additive is added in the electrolyte for a lithium ion battery, and meanwhile, an additive or an additive composition which can prevent the fire retardant from degrading electrochemical properties of the electrolyte is added, so that the electrolyte has fire retardant property or noninflammability, and the security of the battery is improved; meanwhile, the influence on the electrochemical properties of the battery caused by the fire retardant is overcome, so that the properties of the battery are excellent.

Description

technical field [0001] The invention relates to the technical field of battery electrolyte, in particular to a lithium-ion battery electrolyte with high flame retardancy and electrochemical performance and a preparation method thereof. Background technique [0002] Due to the advantages of high energy density, high output voltage, long cycle life, and low environmental pollution, lithium-ion batteries have extremely important applications in the fields of electronic products, electric vehicles, aerospace, and energy storage. However, in recent years, there have been frequent reports of fires and even explosions caused by lithium-ion batteries, and the safety of lithium-ion batteries has attracted widespread attention. At the same time, safety issues are also a bottleneck restricting the development of lithium-ion batteries in the direction of large-scale and high-energy. [0003] The most important components of a lithium-ion battery are the positive and negative electrode m...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42
CPCH01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 邵俊华孔东波张利娟闫国锋李海杰郭飞侯红歧
Owner HENAN FAENLAITE NEW ENERGY SCI & TECH CO LTD
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