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A kind of high-voltage lithium-ion secondary battery electrolyte

A secondary battery, lithium ion technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as battery cycle performance deterioration

Active Publication Date: 2016-08-24
XIAMEN SHOUNENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte solves the problem that the organic solvent of the electrolyte is oxidized and decomposed on the surface of the positive electrode during the high-voltage charge and discharge process of the battery, which leads to the deterioration of the battery cycle performance.

Method used

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  • A kind of high-voltage lithium-ion secondary battery electrolyte
  • A kind of high-voltage lithium-ion secondary battery electrolyte
  • A kind of high-voltage lithium-ion secondary battery electrolyte

Examples

Experimental program
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Effect test

preparation example Construction

[0012] The preparation method of described positive plate is: LiNi 0.5 co 0.2 mn 0.3 o 2 , Conductive agent SuperP, and adhesive PVDF are mixed uniformly at a mass ratio of 95:3.0:2.0 to make a certain viscosity lithium-ion secondary battery positive electrode slurry, which is coated on the current collector aluminum foil, and the coating amount is 0.0194g / cm 2 , after drying at 85°C, cold pressing; then trimming, cutting, and slitting, and drying at 85°C for 4 hours under vacuum conditions after slitting, and welding the tabs to make lithium-ion di Secondary battery positive.

[0013] The preparation method of the negative electrode sheet is as follows: graphite, conductive agent SuperP, thickener CMC, and adhesive SBR are made into slurry at a mass ratio of 96.5:1.0:1.0:1.5, coated on the current collector copper foil and placed on the Dried at 85°C, the coating weight is 0.011g / cm 2 After trimming, cutting, and slitting, dry at 110° C. for 4 hours under vacuum conditio...

Embodiment 1

[0021] Ethylene carbonate (EC), propylene carbonate (EMC), ethyl methyl carbonate (DEC), and additive 1,3-propane sultone (PS) (a kind of sulfonate compound) and 5 -Phosphoryl-3-phenylisoxazoline, mixed according to the mass ratio of Table 1 to obtain an electrolyte solvent, and dissolve 1M LiPF in the electrolyte solvent 6 That is, a non-aqueous electrolyte solution is obtained.

[0022] Preparation of lithium-ion secondary battery: The positive electrode sheet, negative electrode sheet and separator of the lithium-ion secondary battery prepared according to the aforementioned process are made into a lithium-ion secondary battery with a thickness of 4.2mm, a width of 34mm, and a length of 82mm through a winding process. Batteries were vacuum baked at 75°C for 10 hours, injected with the above-mentioned non-aqueous electrolyte, and left to stand for 24 hours, then charged to 4.5V with a constant current of 0.1C (140mA), and then charged at a constant voltage of 4.5V until the ...

Embodiment 2

[0024] The lithium ion secondary battery was prepared with reference to the method of Example 1, except that when preparing the lithium ion secondary battery electrolyte, the 5-phosphoryl-3-phenylisoxazoline with a mass percentage of 0.3% was used instead of the example The mass percent content in 1 is 0.1% of 5-phosphoryl-3-phenylisoxazoline.

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Abstract

The invention provides a high-voltage lithium ion lithium ion secondary battery electrolyte. The high-voltage lithium ion lithium ion secondary battery electrolyte comprises a non-aqueous organic solvent and 1M of LiPF6 lithium salt dissolved in the non-aqueous organic solvent. The non-aqueous organic solvent contains 0.1-2.5mass% of 5-phosphoryl-3-phenylisoxazoline; and the structural formula of 5-phosphoryl-3-phenylisoxazoline is shown in the specification. The 5-phosphoryl-3-phenylisoxazoline with the above molecular structural formula added to the high-voltage lithium ion lithium ion secondary battery electrolyte has a low oxidation potential, so a compact and stable passive film is formed on the surface of a positive anode in a primary charging process, thereby the oxidation decomposition of the organic solvent of the electrolyte on the surface of the positive electrode can be effectively inhibited, and the rapid attenuation problem of the capacity of a battery in a high-voltage charging and discharging process is effectively solved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to an electrolyte that can obviously improve the cycle performance of a high-voltage lithium-ion battery, and a lithium-ion battery using the electrolyte. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long life, wide operating temperature range, good safety, environmental protection, and low self-discharge rate. They have been widely used in mobile devices, digital products, energy storage power stations, power batteries and other fields. With the advancement of science and technology, the functions of digital products are becoming more and more powerful, and the insufficient battery life is becoming more and more obvious; at the same time, digital products have a tendency to become lighter and thinner. Insufficient battery performance has become a serious problem affecting the development of digital products; improving the en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 王阿忠胡念赖彩娥
Owner XIAMEN SHOUNENG TECH
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