Lithium ion battery electrolyte and application thereof

A lithium-ion battery and electrolyte technology, which is applied in the direction of secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of high volume expansion rate and internal resistance increase rate, unfavorable industrial manufacturing and practical application, unstable storage state, etc. problem, achieve the effects of reducing impedance, improving low-temperature charge and discharge performance, and improving cycle performance

Pending Publication Date: 2022-06-03
SHENZHEN YANYI NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its impedance is high, and the acid value of the electrolyte tends to increase during high-temperature storage, and the storage state is unstable, so there is a need for improvement.
[0007] Patent application CN107017433B discloses a kind of lithium ion battery electrolyte, and it comprises non-aqueous organic solvent, lithium salt, and additive, and described additive comprises aryl sulfate etc., is conducive to improving capacity retention rate and discharge capacity and high temperature performance, but Its volume expansion rate and internal resistance increase rate are relatively large, which is not conducive to industrial manufacturing and practical application

Method used

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  • Lithium ion battery electrolyte and application thereof
  • Lithium ion battery electrolyte and application thereof
  • Lithium ion battery electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063]

[0064] In an argon atmosphere glove box with a water content 6 ) and 0.5 parts by mass of lithium difluorophosphate (LiPO 2 F 2 ) was dissolved in the above organic solvent, 0.5 parts by mass of compound A1, 1.0 parts by mass of compound B1, and 2.0 parts by mass of 2,4-butane sultone were added, and stirred at 200 rpm with a mixer for 30 minutes until uniform to obtain The lithium ion battery electrolyte of Example 1.

[0065]

[0066] (1) Preparation of positive electrode sheet

[0067]The positive active material nickel cobalt lithium manganate (NCM811), the conductive agent SuperP, carbon nanotubes, and the binder polyvinylidene fluoride (PVDF) were mixed with N-methylpyrrolidone ( NMP) mixed well to make a positive electrode slurry, coated on the current collector aluminum foil with a thickness of 100 μm, dried at 70 ° C, cold pressed at 4 Mpa at room temperature, and then trimmed, cut into pieces, and slit, and then welded. The tabs are made into positive...

Embodiment 2

[0073] The lithium ion battery electrolyte and lithium ion battery were prepared with reference to the method of Example 1, the difference is that when preparing the lithium ion battery electrolyte, 2.0 parts by mass of compound A2 and 2.0 parts by mass of compound B2 were added, and no other additives were added. .

Embodiment 3

[0075] A lithium ion battery electrolyte and a lithium ion battery were prepared with reference to the method of Example 1, except that, when preparing the lithium ion battery electrolyte, 0.2 parts by mass of compound A3, 0.5 parts by mass of compound B3, and 3.0 parts by mass were added 1,3-propane sultone.

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Abstract

The invention relates to a lithium ion battery electrolyte and an application thereof, the lithium ion battery electrolyte comprises a lithium salt, an organic solvent and an additive, the additive comprises a compound A as shown in a formula (I) and a compound B as shown in a formula (II), and the additive can further comprise 2, 4-butane sultone and other additives. According to the lithium ion battery electrolyte, the high-temperature storage performance of the lithium ion battery can be improved, high-temperature gas production is inhibited, impedance is reduced, meanwhile, the low-temperature charge-discharge performance is improved, and the cycle performance at normal temperature and high temperature is improved.

Description

technical field [0001] The invention relates to the field of electrolytes for lithium ion batteries, in particular to a lithium ion battery electrolyte and applications thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, long cycle life, good safety performance, small self-discharge, fast charging, and wide operating temperature range. They are widely used in electronic products, power tools, energy storage equipment, new energy automotive and other fields. With the expansion of lithium-ion battery application scenarios, people pay more and more attention to the high-temperature storage performance, low-temperature charge-discharge performance, and charge-discharge cycle performance of lithium-ion batteries. [0003] Lithium-ion battery electrolyte, as an important part of lithium-ion battery, has a significant impact on the high-temperature storage performance, low-temperature charge-discharge performance...

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 岳敏刘杰曾益平李斌
Owner SHENZHEN YANYI NEW MATERIALS CO LTD
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