Lithium battery electrolyte and preparation method thereof

An electrolyte and lithium battery technology, applied in the field of lithium battery electrolyte and its preparation, can solve problems such as unstable performance and low conductivity, and achieve the effects of improving compatibility, increasing reduction potential, and prolonging service life

Inactive Publication Date: 2019-04-05
广东永邦新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, when the existing electrolyte is applied to lithium...

Method used

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  • Lithium battery electrolyte and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] A lithium battery electrolyte, including organic solvents, additives, tris(trimethylsilane) borate, and lithium hexafluorophosphate, wherein tris(trimethylsilane) borate accounts for 0.5% of the total mass of the lithium battery electrolyte, and lithium hexafluorophosphate Accounting for 6% of the total mass of lithium battery electrolyte;

[0025] The additives include stabilizers, SEI film-forming additives, and flame retardants, and the mass ratio of the stabilizers, flame retardants, and SEI film-forming additives is 60:4:1;

[0026] The stabilizer is a mixture of ethoxypentafluorocyclotriphosphazene, hexafluoroisopropanol methyl ether, and fluoroethylene carbonate at a mass ratio of 1:1:1;

[0027] The SEI film-forming additive is composed of vinylene carbonate and vinyl sulfite in a mass ratio of 1:3;

[0028] The flame retardant is composed of triphenyl phosphate and triethyl phosphate in a mass ratio of 1:4.

[0029] The organic solvent includes dimethyl carbo...

Embodiment 2

[0033] A lithium battery electrolyte, including organic solvents, additives, tris(trimethylsilane) borate, and lithium hexafluorophosphate, wherein tris(trimethylsilane) borate accounts for 1% of the total mass of the lithium battery electrolyte, and lithium hexafluorophosphate Accounting for 8% of the total mass of lithium battery electrolyte;

[0034] The additives include stabilizers, SEI film-forming additives, and flame retardants, and the mass ratio of the stabilizers, flame retardants, and SEI film-forming additives is 50:5:1;

[0035] The stabilizer is composed of ethoxypentafluorocyclotriphosphazene, hexafluoroisopropanol methyl ether, and fluoroethylene carbonate in a mass ratio of 1:1:2;

[0036] The SEI film-forming additive is vinylene carbonate;

[0037] The flame retardant is composed of triphenyl phosphate and triethyl phosphate in a mass ratio of 2:1.

[0038] The organic solvent includes dimethyl carbonate and ethyl propionate, and the volume ratio of the t...

Embodiment 3

[0042] A lithium battery electrolyte, including organic solvents, additives, tris(trimethylsilane) borate, and lithium hexafluorophosphate, wherein tris(trimethylsilane) borate accounts for 0.2% of the total mass of the lithium battery electrolyte, and lithium hexafluorophosphate Accounting for 10% of the total mass of lithium battery electrolyte;

[0043] The additive includes a stabilizer, an SEI film-forming additive, and a flame retardant, and the mass ratio of the stabilizer, flame retardant, and SEI film-forming additive is 70:3:5;

[0044] The stabilizer is composed of ethoxypentafluorocyclotriphosphazene, hexafluoroisopropanol methyl ether, and fluoroethylene carbonate in a mass ratio of 1:2:1;

[0045] The SEI film-forming additive is composed of ethyl propylene carbonate and butenyl sulfite in a mass ratio of 1:1;

[0046] The flame retardant is composed of triphenyl phosphate and triethyl phosphate in a mass ratio of 5:1.

[0047] The organic solvent includes dimeth...

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Abstract

The present invention relates to the technical field of lithium batteries, and in particular to a lithium battery electrolyte and a preparation method thereof. The lithium battery electrolyte comprises an organic solvent, an additive, tris(trimethylsilyl)borate and lithium hexafluorophosphate. The additive comprises a stabilizer, an SEI film forming additive and a flame retardant, wherein the massratio of the stabilizer, the SEI film forming additive and the flame retardant is 50-80:1-5:1-5; the stabilizer is compounded by an organic fluorine compound; the SEI film-forming additive is at least one of vinylene carbonate, ethylene sulfite, allyl ethyl carbonate and butylene glycol sulfite; and the flame retardant is compounded by the triphenyl phosphate and the triethyl phosphate accordingto the mass ratio of 1-5:1-5. The conductivity of the electrolyte of the lithium battery is above 12ms/cm and near 13 ms/cm, the lithium battery has good preformances, the number of cycles is not smaller than 700, the internal resistance is not larger than 5.2 m[Omega], the first effect is not smaller than 93%, the capacity reaches up to 6510 mAh, and the energy density reaches up to 158.6 Wh/K.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery electrolyte and a preparation method thereof. Background technique [0002] "Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. In 1912, the lithium metal battery was first proposed and studied by Gilbert N. Lewis. In the 1970s, M. S. Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium batteries have become the mainstream now. [0003] Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Li-ion batterie...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/052H01M10/058H01M10/42
CPCH01M10/052H01M10/0567H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 姚学永唐忠荣王启平
Owner 广东永邦新能源股份有限公司
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