A kind of high temperature and high pressure resistant electrolyte solution for sulfur lithium battery and preparation method thereof

An electrolyte and high-temperature-resistant technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as increased battery impedance, damage to battery performance, and accelerated thermal decomposition process

Active Publication Date: 2020-09-11
安徽通能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

During the high-voltage charging process, the above-mentioned electrolyte will be thermally decomposed due to high pressure and high temperature, and when there are a small amount of water molecules in the electrolyte, the thermal decomposition process will be greatly accelerated, resulting in continuous increase in battery impedance. impairs battery performance

Method used

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  • A kind of high temperature and high pressure resistant electrolyte solution for sulfur lithium battery and preparation method thereof
  • A kind of high temperature and high pressure resistant electrolyte solution for sulfur lithium battery and preparation method thereof

Examples

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Embodiment 1

[0033] A method for preparing a high-temperature and high-pressure-resistant electrolyte solution for lithium-sulfur batteries, comprising the following steps: placing lithium hexafluorophosphate in a vacuum drying oven, and drying at a temperature of 80°C for 5 hours; then, using gloves under the protection of an inert gas In the box, dissolve the dried lithium hexafluorophosphate in the propylene carbonate solvent, shake well, and let it stand for 10 hours to obtain the basic electrolyte; finally, in the glove box under the protection of inert gas, the o-(diethyl)aminoacid Oxysilane and bis(diethyl)aminoacyloxysilane mixed electrolyte additive and trimethyl phosphate flame retardant additive were added to the base electrolyte.

[0034] More specifically, the synthesis method of the electrolyte additive, the specific process is as follows: add the dehydrated ethylenediamine and isopropanol solvent into a dry reaction kettle, and add acyloxysilane under the protection of an ine...

Embodiment 2

[0036] A method for preparing a high-temperature and high-pressure-resistant electrolyte solution for lithium-sulfur batteries, comprising the following steps: placing lithium hexafluorophosphate in a vacuum drying oven, and drying at a temperature of 80°C for 5 hours; then, using gloves under the protection of an inert gas In the box, dissolve the dried lithium hexafluorophosphate in the propylene carbonate solvent, shake well, and let it stand for 10 hours to obtain the basic electrolyte; finally, in the glove box under the protection of inert gas, the o-(diethyl)aminoacid Oxysilane electrolyte additives and trimethyl phosphate flame retardant additives are added to the base electrolyte.

[0037] More specifically, the synthesis method of the electrolyte additive, the specific process is as follows: add the dehydrated ethylenediamine and isopropanol solvent into a dry reaction kettle, and add acyloxysilane under the protection of an inert gas. ℃, reacted for 8 hours, wherein, ...

Embodiment 3

[0039] A method for preparing a high-temperature and high-pressure-resistant electrolyte solution for lithium-sulfur batteries, comprising the following steps: placing lithium hexafluorophosphate in a vacuum drying oven, and drying at a temperature of 80°C for 5 hours; then, using gloves under the protection of an inert gas In the box, dissolve the dried lithium hexafluorophosphate in the propylene carbonate solvent, shake well, and let it stand for 10 hours to obtain the basic electrolyte; finally, in the glove box under the protection of inert gas, the o-(diethyl)aminoacid Oxysilane electrolyte additives and trimethyl phosphate flame retardant additives are added to the base electrolyte.

[0040] More specifically, the synthesis method of the electrolyte additive, the specific process is as follows: add the dehydrated ethylenediamine and isopropanol solvent into a dry reaction kettle, and add acyloxysilane under the protection of an inert gas. ℃, reacted for 8 hours, wherein...

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Abstract

The invention discloses a high-temperature and high-pressure-resistant electrolyte solution for sulfur-lithium batteries and a preparation method thereof, belonging to the field of preparation of sulfur-lithium battery equipment. It includes the following steps: placing the lithium salt in a vacuum drying oven to dry; then under the protection of an inert gas, dissolving the dried lithium salt in a solvent to obtain a basic electrolyte; finally adding electrolyte additive A and electrolyte additive B to the in the base electrolyte. In the present invention, o-(diethyl)aminoacyloxysilane or bis(diethyl)aminoacyloxysilane electrolyte additive A is added to the existing electrolyte to absorb the water molecules present in the electrolyte , to prevent the thermal decomposition of the electrolyte, and on the other hand, the Si group reacts with HF, thereby reducing the generation of "dead sulfur" on the surface of the positive electrode. It solves the problem that the existing sulfur-lithium battery is under high temperature and high pressure, which leads to an increase in battery impedance and damages the performance of the battery.

Description

technical field [0001] The invention belongs to the field of preparation of sulfur-lithium battery equipment, in particular to a high-temperature and high-pressure-resistant electrolyte solution for sulfur-lithium batteries and a preparation method thereof. Background technique [0002] As a new generation of green secondary batteries, lithium-ion batteries have the advantages of small size, light weight, large capacity, small self-discharge, long cycle life, and no memory effect. They are widely used in electronic devices and become electric vehicles, One of the main power sources such as mobile power. In order to meet the requirements of electric vehicles for a higher working range, improving the energy density of lithium batteries has become an important research direction for the application of sulfur-lithium batteries today. With the emergence of high-voltage positive electrode active materials, when the charging voltage is greater than 4.5V, the existing carbonate ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0567
CPCH01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 周海燕姜华
Owner 安徽通能新能源科技有限公司
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