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Lithium ion battery electrolyte capable of improving high and low temperature cycle performance and lithium ion battery

A lithium-ion battery, high-low temperature cycle technology, applied in the field of lithium-ion battery electrolyte and lithium-ion batteries, can solve the problems of high film-forming resistance and poor low-temperature performance, and achieve low film-forming resistance, high-temperature and low-temperature cycle performance improvement , good effect of battery cycle performance

Active Publication Date: 2020-10-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the reported lithium oxalate phosphate or lithium borate compound additives have a good effect of improving high-temperature cycles, they usually have high film-forming resistance, resulting in poor low-temperature performance.

Method used

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  • Lithium ion battery electrolyte capable of improving high and low temperature cycle performance and lithium ion battery
  • Lithium ion battery electrolyte capable of improving high and low temperature cycle performance and lithium ion battery
  • Lithium ion battery electrolyte capable of improving high and low temperature cycle performance and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of electrolyte additive: lithium difluorodithiooxalate borate, the structural formula is as follows:

[0031]

[0032] Specific steps are as follows:

[0033] (1) In a 2000ml three-necked flask equipped with an electric stirrer and a thermometer, add 500ml of deionized water, control the temperature at 10°C, first add 1mol of dithiooxalic acid, and then slowly add 1mol of lithium carbonate in batches, and fully stir the reaction After filtering to remove insoluble materials, drying under reduced pressure to obtain lithium dithiooxalate with a yield of 92%;

[0034] (2) In a 1000ml three-necked flask equipped with an electric stirrer and a thermometer, add 300ml of acetonitrile, control the temperature at 20°C, first add 2.5mol of lithium dithiooxalate, and then slowly pass in 0.5mol of boron trifluoride in batches. After fully stirring the reaction, the insoluble matter was removed by filtration, and after solvent recrystallization and drying under reduced pressur...

Embodiment 2

[0041] According to the method of Example 1, lithium difluorodithiooxalate borate was prepared.

[0042] Prepare electrolyte 2 and experimental battery 2 according to the method of Example 1. The difference is that in electrolyte 2, the mass percentages of lithium hexafluorophosphate, organic solvent, vinylene carbonate, and lithium difluorodithiooxalate are 13.5% and 75, respectively. %, 1.5%, 10%.

Embodiment 3

[0044] Preparation of electrolyte additive: lithium bisdithio oxalate borate, its structural formula is as follows:

[0045]

[0046] Specific steps are as follows:

[0047] (1) In a 2000ml three-necked flask equipped with an electric stirrer and thermometer, add 500ml of deionized water, control the temperature to 40℃, first add 5mol of dithiooxalic acid, and then slowly add 1mol of lithium hydroxide in batches, and fully stir the reaction After filtering to remove insoluble materials, drying under reduced pressure to obtain lithium dithiooxalate with a yield of 95%;

[0048] (2) In a 1000ml three-necked flask equipped with an electric stirrer and a thermometer, add 300ml of acetone, control the temperature at 60℃, first add 5mol of lithium dithiooxalate, and then slowly pass in 0.5mol of boron trifluoride in batches. After stirring the reaction, the insoluble matter was removed by filtration. After solvent recrystallization and drying under reduced pressure, lithium bisdithiooxala...

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Abstract

The invention discloses a lithium ion battery electrolyte capable of improving high and low temperature cycle performance and a lithium ion battery. The lithium ion battery electrolyte comprises a sulfur-containing polyfunctional electrolyte additive, and the sulfur-containing polyfunctional electrolyte additive is lithium dithiooxalatoborate or lithium dithiooxalatophosphate. On one hand, oxalategroups in the additive can be oxidized, reduced and polymerized on the surface of an electrode material to form a uniform and compact solid electrolyte membrane. On the other hand, the additive contains part of sulfur atoms, so that sulfide components with high ionic conductivity can be promoted to be formed in the solid electrolyte membrane. Therefore, the lithium ion battery electrolyte containing the additive can improve the high-temperature and low-temperature cycle performance of the lithium ion battery at the same time, and compared with the traditional electrolyte containing the oxalicacid lithium phosphate or lithium borate additive, the lithium ion battery electrolyte containing the additive is lower in film forming impedance and better in battery cycle performance.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion battery electrolyte, in particular to a lithium electronic battery electrolyte and a lithium ion battery for improving high and low temperature cycle performance. Background technique [0002] Lithium-ion batteries have significant advantages such as high energy density, low self-discharge rate, wide operating temperature range, long cycle life, and no memory effect. They are widely used in 3C digital, new energy vehicles, energy storage power stations, aerospace and other fields. [0003] Electrolyte is an indispensable and important part of lithium-ion batteries, which has an important impact on its capacity, internal resistance, cycle, rate, safety and other properties. However, the current commercial electrolytes contain a large amount of carbonate organic solvents. Although it can guarantee the higher ion conductivity and electrochemical stability required for normal operation of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 梁大宇俞金萍庞春光
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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