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Electrolyte for high-voltage lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in the field of electrolyte, can solve the problems of lithium-ion battery capacity attenuation, electrolyte prone to oxidation reaction, etc., and achieve the effect of improving high voltage performance, improving cycle performance, and small internal resistance change

Inactive Publication Date: 2020-01-17
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high voltage, due to the increase of the reactivity of the cathode material, the electrolyte is prone to oxidation reaction, which leads to the rapid decline of the capacity of lithium-ion batteries under high voltage conditions.

Method used

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  • Electrolyte for high-voltage lithium ion battery
  • Electrolyte for high-voltage lithium ion battery
  • Electrolyte for high-voltage lithium ion battery

Examples

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preparation example Construction

[0030] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0031] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0032] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are used for description purposes only, and do not indicate or imply relative importance.

Embodiment 1

[0034] Electrolyte preparation: In an argon-filled glove box (moisture 6 Electrolyte, then sequentially add 0.2wt% dimethyl sulfonyl ethane, 1.0wt% lithium bistrifluoromethanesulfonylimide and 1.0wt% CHF 2 CH 2 OCH 2 CH 3 , to obtain the lithium-ion battery electrolyte of Example 1 after stirring evenly.

[0035] Preparation of the positive electrode sheet: the positive electrode active material lithium cobalt oxide material LiCoO 2 , the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are fully stirred and mixed in the N-methylpyrrolidone system according to the mass ratio of 95:3:2, and coated on the positive electrode current collector Al foil. The positive electrode sheet was obtained after dry cold pressing.

[0036] Preparation of negative electrode sheet: Negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber (SBR), thickener sodium carboxymethyl cellulose (CMC) are removed in a ...

Embodiment 2

[0040] All the other steps are the same as in Example 1, the only difference is that the preparation of electrolyte is different:

[0041] Electrolyte preparation: In an argon-filled glove box (moisture 6 Electrolyte, then add 0.5wt% dimethyl sulfonyl ethane, 1.0wt% lithium bistrifluoromethanesulfonylimide and 1.0wt% CHF 2 CH 2 OCH 2 CH 3 , after stirring evenly, the lithium-ion battery electrolyte of Example 2 was obtained.

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Abstract

The invention provides an electrolyte for a high-voltage lithium ion battery as well as a preparation method and application of the electrolyte. The electrolyte can improve the high-voltage performance of the lithium ion battery. The high-voltage electrolyte for the lithium ion battery comprises a non-aqueous organic solvent, a lithium salt and an electrolyte additive, and the electrolyte additivecomprises a bis (sulfonyl) compound, lithium bis (trifluoromethanesulfonyl) imide and fluoroether, wherein the dosage of the bis-sulfonyl compound is 0.1 wt%-5wt% of the total weight of the electrolyte, the dosage of the lithium bis (trifluoromethanesulfonyl) imide is 0.1 wt%-2wt% of the total weight of the electrolyte, and the dosage of the fluoroether is 0.5 wt%-10wt% of the total weight of theelectrolyte. The lithium ion battery electrolyte can effectively improve the cycle performance of the lithium ion battery in a high-voltage environment, and the internal resistance change of the battery is small.

Description

technical field [0001] The invention relates to an electrolytic solution for a high-voltage lithium-ion battery, belonging to the technical field of electrolytic solutions. Background technique [0002] Lithium-ion batteries are widely favored due to their advantages such as high energy density, high operating voltage, no memory effect, long cycle life and low self-discharge. With the promotion of electric vehicles and other equipment, the demand for lithium-ion batteries with high energy density is becoming more and more urgent. by the energy formula It can be seen that increasing the operating voltage of lithium-ion batteries can effectively increase the energy density. At present, the voltage range used by lithium-ion batteries is mainly 3.0-4.35V. If the upper limit of the working voltage of lithium-ion batteries is increased, such as increasing to above 4.35V, the gram capacity of the electrode material will be improved, which can effectively improve the lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 吴茂祥郑香珍潘荧黄韬
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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