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Electrolyte for lithium battery and lithium ion battery

An electrolyte and lithium battery technology, applied in the field of lithium-ion batteries, can solve problems such as low-temperature power performance deterioration, achieve high-temperature storage capacity recovery rate and performance improvement of suppression of gas production, high-temperature storage capacity recovery rate and suppression of gas production improvement, Effect of improving low-temperature DCR performance

Active Publication Date: 2021-09-28
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the high temperature performance of the battery is improved by adding self-sacrificing additives in the prior art, but accompanied by the deterioration of low temperature power performance, the purpose of the present invention is to provide an electrolyte for lithium batteries to improve the high temperature performance of lithium ion batteries While maintaining the low-temperature power characteristics of lithium-ion batteries

Method used

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  • Electrolyte for lithium battery and lithium ion battery
  • Electrolyte for lithium battery and lithium ion battery
  • Electrolyte for lithium battery and lithium ion battery

Examples

Experimental program
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Effect test

preparation example Construction

[0052] Preparation of lithium-ion batteries

[0053] Preparation of positive electrode sheet

[0054] The positive electrode active material lithium nickel cobalt manganese oxide (LiNi 0.7 mn 0.2 co 0.1 ), the binder polyvinylidene fluoride (PVDF), and the conductive agent acetylene black Super-P were mixed according to the mass ratio of 96:2:2, N-methylpyrrolidone was added, and stirred in a vacuum mixer until stable and uniform to obtain the positive electrode slurry . The positive electrode slurry was uniformly coated on an aluminum foil with a thickness of 12um, and the coated aluminum foil was dried in a blast oven at 120°C, and then cold pressed and cut to obtain positive electrode sheets.

[0055] Negative sheet preparation

[0056] Negative electrode active material artificial graphite, binder styrene-butadiene rubber (SBR), thickener sodium carboxymethylcellulose (CMC), conductive agent acetylene black Super-P are mixed according to mass ratio 97:1:1:, add to Io...

Embodiment 1

[0072] Example 1 and Example 2 compared and evaluated the effect of cyclophosphazene additives shared with A1 and B1 additives. In this scheme, the combined use of A1 and B1 can achieve a better improvement effect. In this case, cyclophosphazene There is no synergistic improvement effect in the above, where C12 is the C2 cyclophosphazene compound in the Chinese patent ZL201611244549.0. In fact, the inventor has also done a good job in the combination and use of other cyclophosphazene compounds involved in this patent. Further studies did not show a further synergistic improvement effect, that is, the combination of fluorosulfonate and fluorophosphate can obtain better results without the presence of cyclic phosphazene compound.

[0073] Compared with Example 1 and Example 3, the introduction of C8 can significantly improve the cycle performance, high-temperature storage capacity retention rate and volume expansion rate, but it will deteriorate the low-temperature DCR of the bat...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses an electrolyte for a lithium battery. In the prior art, the high-temperature performance of a battery is improved by adding a self-sacrifice additive but the low-temperature power performance is deteriorated. The invention just aims to solve the above problem. The electrolyte comprises a lithium salt, an organic solvent, a silicon fluorosulfonate compound and lithium fluorophosphate; the silicon fluorosulfonate compound and the lithium fluorophosphate are simultaneously introduced into the electrolyte, and the research of the inventor shows that the silicon fluorosulfonate compound and the lithium fluorophosphate can cooperate to act on an electrode interface of the lithium ion battery, so that the cycle performance and the high-temperature storage performance of the lithium ion battery are remarkably improved, and meanwhile, the low-temperature power characteristic of the battery can be remarkably improved.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, and specifically relates to an electrolyte for lithium batteries and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in electronic products, automotive industry, and electrochemical energy storage due to their high energy density, no memory effect, and high operating voltage. With the widespread application of lithium-ion batteries, higher requirements have been placed on their environmental adaptability. For example, maintaining good low-temperature power performance for lithium-ion batteries in higher latitudes or cold areas poses a challenge. [0003] In recent years, lithium-ion battery technology has developed rapidly. In order to cope with the demand for battery energy density in electric vehicles, the gram capacity of the material has been increased by increasing the operating voltage of the battery and increasing the nickel ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 周晓崇李娟
Owner WANXIANG 123 CO LTD
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