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High-voltage-resistant and flame-retardant type lithium ion battery electrolyte and preparation method therefor

A lithium-ion battery, flame-retardant technology, used in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of immature electrolyte technology and battery system performance degradation, and achieve inhibition of oxidation and reduction decomposition , good flame retardancy and high pressure resistance

Inactive Publication Date: 2017-11-17
无锡九宇宝新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte system composed of conventional carbonate solvent and lithium hexafluorophosphate will decompose when it is above 4.5V, resulting in a decrease in the performance of the entire battery system
Electrolyte technology that works stably at this voltage is not yet mature

Method used

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  • High-voltage-resistant and flame-retardant type lithium ion battery electrolyte and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: A kind of high-voltage flame-retardant lithium-ion battery electrolyte, made of lithium salt LiPF 6 , an organic solvent, a film-forming additive and a flame retardant; the concentration of the lithium salt is 2mol / L; the flame retardant is a fluorophosphazene compound with a chemical formula of N 3 P 3 f 5 Oh 2 CH 3 , and its mass percent of the total weight of the organic solvent is 8%; the quality of the film-forming additive is equivalent to 3% of the lithium salt quality, and the balance is the organic solvent.

[0024] Further, the organic solvent is a mixed solvent of DMC, EC and dinitrile solvent, the volume ratio of DMC, EC and dinitrile solvent is 1:1:2, and the dinitrile solvent is adiponitrile; Compared with the existing carbonate solvents, the organic solvent of the present invention has excellent high-voltage stability, thereby maintaining the stability of the high-voltage electrode / electrolyte interface, and at the same time, the organic...

Embodiment 2

[0030] Embodiment 2: a kind of high-voltage resistant flame-retardant lithium ion battery electrolyte, is made up of lithium salt LiTFSI, organic solvent, film-forming additive and flame retardant; The concentration of described lithium salt is 1.5mol / L; The described The flame retardant is a fluorophosphazene compound with the chemical formula N 3 P 3 f 5 Oh 2 CH 3 , which account for 5% by mass of the total weight of the organic solvent; the mass of the film-forming additive is equivalent to 2% of the mass of the lithium salt.

[0031] Further, described organic solvent is the mixed solvent of DMC, EC and dinitrile solvent, and the volume ratio of DMC, EC and dinitrile solvent is 3:3:4; Described film-forming additive is fluoroethylene carbonate and The film-forming agent lithium dioxalate borate, wherein fluoroethylene carbonate accounts for 10% of the film-forming additive; the dinitrile solvent is sebaconitrile.

[0032] The specific steps of the preparation method o...

Embodiment 3

[0033] Embodiment 3: a kind of high-voltage resistant flame-retardant lithium-ion battery electrolyte, made of lithium salt LiBF 4 , an organic solvent, a film-forming additive and a flame retardant; the concentration of the lithium salt is 3mol / L; the flame retardant is a fluorophosphazene compound with a chemical formula of N 3 P 3 f 5 Oh 2 CH 3 , and its mass percentage of the total weight of the organic solvent is 10%; the mass of the film-forming additive is equivalent to 4% of the mass of the lithium salt.

[0034] Further, described organic solvent is the mixed solvent of DMC, EC and dinitrile solvent, and the volume ratio of DMC, EC and dinitrile solvent is 1:1:1; Described film-forming additive is fluoroethylene carbonate and The film-forming agent lithium dioxalate borate, wherein fluoroethylene carbonate accounts for 12% of the film-forming additive; the dinitrile solvent is glutaronitrile.

[0035] The specific steps of the preparation method of the high-volta...

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PUM

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Abstract

Disclosed is a high-voltage-resistant and flame-retardant type lithium ion battery electrolyte. The electrolyte consists of a lithium salt, an organic solvent, a film-forming additive and a flame retardant; the lithium salt is 1.5-3mol / L in concentration; the flame retardant is a fluoro phosphonitrile compound; the fluoro phosphonitrile compound has the chemical formula of N<3>P<3>F<5>OH<2>CH<3> which accounts for 5-10% of the total organic solvent based on mass percentage; and the mass of the film-forming additive is 2-4% of the that of lithium salt. The invention discloses the high-voltage-resistant and flame-retardant type lithium ion battery electrolyte and a preparation method therefor.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage-resistant flame-retardant lithium-ion battery electrolyte and a preparation method thereof. Background technique [0002] The electrolyte inside the lithium-ion battery usually contains volatile, low-flash point organic solvents. Therefore, when a short circuit occurs due to external circuit failure or other reasons, the electrolyte may burn. The most common method to improve the safety of lithium batteries is to add flame retardants, such as organophosphorus compounds, halogenated carbonates, halogenated ethers, etc., to the battery electrolyte. Among them, organophosphorus compounds as flame retardants have better flame retardant effect, low toxicity, and more researches. Although these flame retardants can reduce the flammability of the electrolyte, the electrochemical stability of these flame retardants in the battery is poor. Or its physical pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0567H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 陈峰
Owner 无锡九宇宝新能源科技有限公司
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