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Electrolyte additive for improving battery high-temperature gas expansion, electrolyte and lithium ion battery containing electrolyte

An electrolyte additive and electrolyte technology, applied in the field of lithium ion batteries, can solve problems such as deteriorating battery performance, and achieve the effects of improving stability, improving high-temperature cycle life, and improving high-temperature storage flatulence.

Active Publication Date: 2021-05-25
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strong oxidation of the high-nickel material positive electrode and the volume expansion of the silicon-carbon negative electrode material seriously deteriorate the performance of the battery. Therefore, it is particularly critical to develop an electrolyte that matches the high-nickel / silicon-carbon battery system. The high-temperature flatulence of the battery and the improvement of the high-temperature cycle performance of the battery have become the top priorities

Method used

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  • Electrolyte additive for improving battery high-temperature gas expansion, electrolyte and lithium ion battery containing electrolyte
  • Electrolyte additive for improving battery high-temperature gas expansion, electrolyte and lithium ion battery containing electrolyte
  • Electrolyte additive for improving battery high-temperature gas expansion, electrolyte and lithium ion battery containing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of 1,3-diphosphonate-isothiazole compound W1

[0035]Weigh 13.82g (0.1mol) of potassium carbonate and 16.60g (0.1mol) of 1,3-chloroisothiazole into a three-necked flask, add 150mL of freshly distilled acetone and stir to dissolve, then slowly add 7.50g of divinyl phosphate ( 0.05mol) into the flask, reflux reaction for 10-12h, after the reaction is completed, filter to remove solid potassium chloride and potassium carbonate, rotary evaporate, concentrate the solution, add 50mL water and 100mL ether after concentration, shake vigorously for 5min, let stand for half After 1 hour, the ether layer was taken out, and the ether solution was concentrated after repeated extraction twice to obtain 1,3-bisphosphonate-isothiazole compound, which was named W1, and the weight of W1 was 3.64 g (yield 37%).

Embodiment 2

[0037] Preparation of 1,3-diphosphonate-isothiazole compound W2

[0038] Weigh 13.82g (0.1mol) of potassium carbonate and 16.60g (0.1mol) of 1,3-chloroisothiazole into a three-necked flask, add 150mL of freshly distilled acetone and stir to dissolve, then slowly add bis(1,2-propenyl ) Phosphate ester 8.90g (0.05mol) in the flask, reflux reaction 10-12h, after the reaction is completed, filter to remove solid potassium chloride and potassium carbonate, rotary evaporation, concentrated solution, add 50mL water and 100mL ether after concentrating, force Shake for 5 minutes, take out the ether layer after standing for half an hour, repeat the extraction twice and then concentrate the ether solution to obtain 1,3-bisphosphonate-isothiazole compounds, which are named W2, and the weight of W2 is 4.72g (yield 42%).

Embodiment 3

[0040] Preparation of 1,3-diphosphonate-isothiazole compound W3

[0041] Weigh 13.82g (0.1mol) of potassium carbonate and 16.60g (0.1mol) of 1,3-chloroisothiazole into a three-necked flask, add 150mL of freshly distilled acetone and stir to dissolve, then slowly add 7.25g of diethynyl phosphate ( 0.05mol) into the flask, reflux reaction for 10-12h, after the reaction is completed, filter to remove solid potassium chloride and potassium carbonate, rotary evaporate, concentrate the solution, add 50mL water and 100mL ether after concentration, shake vigorously for 5min, let stand for half After 1 hour, the ether layer was taken out, and the ether solution was concentrated after repeated extraction twice to obtain 1,3-bisphosphonate-isothiazole compound, which was named W3, and the weight of W3 was 4.41 g (yield 46%).

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Abstract

The invention discloses an electrolyte additive for improving high-temperature flatulence of a battery, and relates to the technical field of lithium ion batteries, the additive comprises a 1,3-diphosphate-isothiazole compound and a water removal additive. The structural general formula of the 1,3-diphosphate-isothiazole compound is shown in the specification, wherein R1 and R2 are respectively and independently selected from one of H, C1-8 alkyl, C4-10 cycloalkyl, C2-10 alkenyl, C2-10 alkynyl, C6-16 aryl, C6-16 heteroaryl and part of fluoro or perfluoro compounds of the H, the C1-8 alkyl, the C4-10 cycloalkyl, the C2-10 alkenyl, the C2-10 alkynyl, the C6-16 heteroaryl and the part of fluoro or perfluoro compounds of the C6-16 heteroaryl. The invention also provides an electrolyte containing the additive and a lithium ion battery. The electrolyte has the beneficial effects that the special high-temperature gas expansion improving additive is added into the electrolyte, so that the reaction between the electrolyte and positive and negative electrode materials in the lithium ion battery under a high-temperature condition is inhibited, the stability of the positive and negative electrode materials under a high-temperature environment is improved, and the storage gas expansion and cycle performance of the battery under the high-temperature condition is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte additive for improving battery high-temperature flatulence, an electrolyte, and a lithium-ion battery containing the electrolyte. Background technique [0002] Lithium-ion batteries are widely used because of their high working voltage, large specific energy, long cycle life and no memory effect. For example, lithium-ion batteries have been widely used in the field of 3C consumer electronics products, and with the new With the development of energy vehicles, lithium-ion batteries are also widely used in the field of power and energy storage. However, with the continuous improvement of people's demand for electric vehicles, the cruising range of electric vehicles has become a focus of attention. However, developing vehicles with higher ranges requires higher battery energy densities. Therefore, it is imminent to develop a battery system with higher e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 沈剑梁大宇俞金萍赵坤
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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