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Lithium battery electrolyte and lithium battery

A lithium battery and electrolyte technology, applied in the field of electrochemistry, can solve the problems of reducing the service life of lithium batteries, accelerating the decomposition of lithium hexafluorophosphate, destroying the SEI film, etc., and achieving the effects of low production cost, stable electrochemical properties and prolonging service life.

Inactive Publication Date: 2018-07-06
梁成光
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, trace amounts of water and hydrofluoric acid in the electrolyte will not only accelerate the decomposition of lithium hexafluorophosphate, but also damage the SEI film, which will deeply affect the normal operation of the positive and negative electrode functions and reduce the service life of lithium batteries

Method used

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  • Lithium battery electrolyte and lithium battery
  • Lithium battery electrolyte and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment is composed of the following substances in mass ratio: vinyl phosphate 18%, propylene phosphate 20%, 1,3-dioxolane 15%, ethylene glycol dimethyl ether 2%, vinylene carbonate 15% %, lithium hexafluorophosphate 20%, borosilicate glass powder 10%.

[0022] The electrolyte generated in this embodiment meets the electrolyte quality standard formulated in the chemical industry standard "HG / T 4067-2008" of the People's Republic of China, wherein the water content is 15ppm, the hydrofluoric acid content is 41ppm, and the conductivity at 25°C is 10.28ms / cm. The aluminum foil and copper foil were placed in the electrolyte produced in this example. Among them, the aluminum foil was completely corroded after 23 months, which was 16 months longer than the corrosion time of common electrolytes on the market; the copper foil was corroded after 18 months. Completely, it is 12 months longer than the corrosion time of ordinary electrolytes on the market.

Embodiment 2

[0024] This embodiment is composed of the following substances in mass ratio: vinyl phosphate 13%, propylene phosphate 25%, 1,3-dioxolane 8%, ethylene glycol dimethyl ether 9%, vinylene carbonate 10% %, lithium hexafluorophosphate 30%, borosilicate glass powder 5%.

[0025] The electrolyte generated in this embodiment meets the electrolyte quality standard formulated in the chemical industry standard "HG / T 4067-2008" of the People's Republic of China, wherein the water content is 17ppm, the hydrofluoric acid content is 42ppm, and the conductivity at 25°C is 10.16ms / cm. The aluminum foil and copper foil were placed in the electrolyte produced in this example, and the aluminum foil was completely corroded after 28 months, which was 19 months longer than the corrosion time of common electrolytes on the market; the copper foil was corroded after 21 months Completely, it is 14 months longer than the corrosion time of ordinary electrolytes on the market.

Embodiment 3

[0027] This embodiment is composed of the following substances in mass ratio: vinyl phosphate 15%, propylene phosphate 22%, 1,3-dioxolane 10%, ethylene glycol dimethyl ether 5%, vinylene carbonate 13% %, lithium hexafluorophosphate 28%, borosilicate glass powder 7%.

[0028] The electrolyte generated in this embodiment meets the electrolyte quality standard formulated in the chemical industry standard "HG / T 4067-2008" of the People's Republic of China, wherein the water content is 13ppm, the hydrofluoric acid content is 46ppm, and the conductivity at 25°C is 10.73 ms / cm. Aluminum foil and copper foil were placed in the electrolyte prepared in this example. Among them, the aluminum foil was completely corroded after 25 months, which was 14 months longer than the corrosion time of common electrolytes on the market; the copper foil was corroded after 19 months. Completely, it is 13 months longer than the corrosion time of ordinary electrolytes on the market.

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Abstract

The invention discloses a lithium battery electrolyte and a lithium battery. The lithium battery electrolyte is composed of the following substances by mass: 13-25% of vinyl phosphate, 20-25% of propylene phosphate, 8-15% of 1, 3-dioxolane, 2-9% of glycol dimethyl ether, 10-15% of vinylene carbonate, 20- 30% of lithium hexafluorophosphate and 5-10% of a borosilicate glass powder; the lithium battery comprises a positive electrode, a negative electrode and an electrolyte; and the electrolyte is the lithium battery electrolyte. The lithium battery electrolyte provided by the invention has the advantages of stable electrochemical properties, low production cost, ability to prolong service life of lithium battery products and important development and promotion values.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a lithium battery electrolyte and a lithium battery. Background technique [0002] A lithium battery usually consists of a positive electrode, a negative electrode and an electrolyte. Among them, the positive electrode contains lithium cobalt oxide and many additives, and these substances are coated on aluminum foil to produce a chemical reaction of charge and discharge; the negative electrode is nano-scale carbon powder such as graphite, and these substances are used by coating on copper foil. The electrolyte in the electrolyte usually includes lithium perchlorate, lithium hexafluorophosphate, etc., but the battery made of lithium perchlorate is not good at low temperature, and there is a danger of explosion. It is currently banned in Japan and the United States; The battery made of salt has good performance, no explosion hazard, and strong applicability, e...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0567H01M10/052H01M10/42
CPCH01M10/052H01M10/0567H01M10/0569H01M10/4235H01M2300/0042Y02E60/10
Inventor 梁成光
Owner 梁成光
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