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 the problems of low electrical conductivity, easy to burn or explode, aggravated lithium battery aging, etc., and achieve good stability and high flame retardancy. Effect

Pending Publication Date: 2020-04-28
广东博龙能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the electrolyte is the main reason affecting the high-temperature performance of lithium batteries, because the decomposition of conventional electrolytes in high-temperature environments is accelerated, resulting in the aging of lithium batteries, and even flammability or explosion in severe cases. At the same time, the existing electrolytes Unstable performance and low conductivity when applied to lithium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A lithium battery electrolyte provided in this embodiment includes the following raw materials: carbonate organic solvent, conductive lithium salt, stabilizer, SEI film-forming additive, triphenyl phosphate, tris(trimethylsilane) borate , 1,4-butane sultone, lithium hexafluorophosphate and modified sepiolite, wherein the SEI film-forming additive is composed of vinylene carbonate, ethyl propylene carbonate and butenyl sulfite, and the The ratio of vinylene carbonate, ethyl propylene carbonate and butenyl sulfite is 1-1.5:0.5-1:1-2.

[0021] Further, the carbonate-based organic solvent includes at least one of ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, ethylene carbonate and propylene carbonate in combination with a linear carboxylic acid ester. In this embodiment, the carbonate-based organic solvent includes diethyl carbonate, propylene carbonate and a combination of linear carboxylate.

[0022] Further, the linear carboxylic acid ester is one of me...

Embodiment 2

[0033] A lithium battery electrolyte provided in this embodiment includes the following raw materials: carbonate organic solvent, conductive lithium salt, stabilizer, SEI film-forming additive, triphenyl phosphate, tris(trimethylsilane) borate , 1,4-butane sultone, lithium hexafluorophosphate and modified sepiolite, wherein the SEI film-forming additive is composed of vinylene carbonate, ethyl propylene carbonate and butenyl sulfite, and the The ratio of vinylene carbonate, ethyl propylene carbonate and butenyl sulfite is 1:0.5:1.

[0034] Further, the carbonate-based organic solvent comprises propylene carbonate combined with a linear carboxylate.

[0035] Further, the linear carboxylate is ethyl acetate.

[0036] Further, the conductive lithium salt includes LiPF6, LiBF4, LiBOB.

[0037] Further, the tris(trimethylsilane) borate accounts for 0.3% of the total mass of the lithium battery electrolyte.

[0038] Further, the water content of the carbonate organic solvent is ≤...

Embodiment 3

[0046] A lithium battery electrolyte provided in this embodiment includes the following raw materials: carbonate organic solvent, conductive lithium salt, stabilizer, SEI film-forming additive, triphenyl phosphate, tris(trimethylsilane) borate , 1,4-butane sultone, lithium hexafluorophosphate and modified sepiolite, wherein the SEI film-forming additive is composed of vinylene carbonate, ethyl propylene carbonate and butenyl sulfite, and the The ratio of vinylene carbonate, ethyl propylene carbonate and butenyl sulfite is 1.3:0.6:1.2.

[0047] Further, the carbonate-based organic solvent includes diethyl carbonate, ethylene carbonate and linear carboxylates in combination.

[0048] Further, the linear carboxylate is ethyl propionate.

[0049] Further, the conductive lithium salt includes LiBOB.

[0050] Further, the tris(trimethylsilane) borate accounts for 0.6% of the total mass of the lithium battery electrolyte.

[0051] Further, the water content of the carbonate organic ...

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Abstract

The invention discloses a lithium battery electrolyte. The electrolyte comprises the following raw materials: a carbonic ester organic solvent, a conductive lithium salt, a stabilizer, an SEI film-forming additive, triphenyl phosphate, tris (trimethylsilane) borate, 1,4-Butanesultone, lithium hexafluorophate and modified sepiolite. The SEI film forming additive is formed by combining vinylene carbonate, propylene carbonate ethyl ester and butylene sulfite, the ratio of vinylene carbonate to propylene carbonate ethyl ester to butylene sulfite is (1-1.5): (0.5-1): (1-2). The invention further discloses a preparation method of the lithium battery electrolyte. Compared with the prior art, the flame retardance and the stability are better.

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 batteries have been widely used because of their ability to store energy, high energy density, long cycle life, and environmental friendliness. In recent years, with the increasingly serious shortage of fossil energy and environmental pollution, lithium batteries have been popularized and applied in the automotive industry. However, the operating temperature range of lithium batteries is narrow, and when the temperature is higher than 60°C, the capacity decays quickly, and it is easy to burn or explode. In actual use, the local temperature of lithium batteries is higher than 60°C during high current discharge, so it is very necessary to study and improve the high temperature performance of lithium batteries. [0003] In the prior art, the electrolyte is the main reaso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/052
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/052H01M2300/0025H01M2300/0028Y02E60/10
Inventor 龙希罕
Owner 广东博龙能源科技有限公司
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