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Non-aqueous electrolyte with long cycle and high temperature characteristics and lithium ion battery

A technology with non-aqueous electrolyte and high-temperature characteristics, which is applied in the field of electrolyte, can solve the problems such as the impact of pouch batteries, and achieve the effects of good cycle performance, less impedance deterioration, and good high-temperature performance

Pending Publication Date: 2021-04-16
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, by adding additives to the electrolyte, such as the film-forming additive VC, although the cycle capacity maintenance rate can be improved and the cycle can be extended, but it is easy to decompose at high temperature and cause gas expansion, which has a particularly serious impact on pouch batteries.

Method used

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  • Non-aqueous electrolyte with long cycle and high temperature characteristics and lithium ion battery
  • Non-aqueous electrolyte with long cycle and high temperature characteristics and lithium ion battery
  • Non-aqueous electrolyte with long cycle and high temperature characteristics and lithium ion battery

Examples

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Embodiment 1

[0049] A kind of nonaqueous electrolytic solution, the concentration of each component in this electrolytic solution is as follows:

[0050] Non-aqueous organic solvent 80.7wt% (EC / EMC / DEC mass ratio is about 3:5:2), lithium hexafluorophosphate 14wt%, lithium difluorophosphate 1wt%, lithium bisfluorosulfonyl imide 1wt%, vinyl sulfate 1wt %, propane sultone 1wt%, vinylene carbonate 0.5wt%, additive A 0.3wt%, lithium difluorobisoxalate phosphate 0.5wt%.

Embodiment 2

[0052] A kind of nonaqueous electrolytic solution, the concentration of each component in this electrolytic solution is as follows:

[0053] Non-aqueous organic solvent 80.7wt% (EC / EMC / DEC mass ratio is about 3:5:2), lithium hexafluorophosphate 14wt%, lithium difluorophosphate 1wt%, lithium bisfluorosulfonyl imide 1wt%, vinyl sulfate 1wt %, propane sultone 1wt%, vinylene carbonate 0.5wt%, additive A 0.5wt%, lithium difluorobisoxalate phosphate 0.3wt%.

Embodiment 3

[0055] A kind of nonaqueous electrolytic solution, the concentration of each component in this electrolytic solution is as follows:

[0056] Non-aqueous organic solvent 80.7wt% (EC / EMC / DEC mass ratio is about 3:5:2), lithium hexafluorophosphate 14wt%, lithium difluorophosphate 1wt%, lithium bisfluorosulfonyl imide 1wt%, vinyl sulfate 1wt %, propane sultone 1wt%, vinylene carbonate 0.5wt%, additive A 0.2wt%, lithium difluorobisoxalate phosphate 0.6wt%.

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Abstract

The invention discloses a non-aqueous electrolyte with long cycle and high temperature characteristics. The non-aqueous electrolyte comprises a lithium salt, a non-aqueous solvent and an additive, wherein the additive at least comprises lithium difluorobis (oxalato) phosphate and a compound with the following structure: in the formula, X represents a saturated carbon chain / unsaturated carbon chain with the carbon atom number of 1-5, an alkoxy chain with the carbon atom number of 1-5, an aromatic substituent with the carbon atom number of 6-12 or a halogen atom. The invention also discloses a lithium ion battery comprising the non-aqueous electrolyte. The non-aqueous electrolyte disclosed by the invention has the characteristics of long circulation and high temperature.

Description

technical field [0001] The invention relates to the technical field of electrolytes, in particular to a non-aqueous electrolyte and a lithium-ion battery with both long-cycle and high-temperature characteristics. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific capacity, long cycle life, no memory effect and environmental friendliness, and are widely used in digital, energy storage, power and military aerospace and other fields. [0003] When lithium-ion batteries are used as power batteries, they not only need to have high energy density, power density and high safety, but also have the characteristics of long service life, especially in the field of electric vehicles and large-scale energy storage. Life expectancy is getting higher and higher. In the existing technology, the cycle performance has been improved through many methods such as material modification and optimization of the internal structure of the ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/10
Inventor 李轶余乐王仁和
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD