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Electrolyte solution additive, electrolyte solution and lithium-ion secondary battery

A secondary battery and electrolyte technology, applied in the field of electrolyte additives, electrolyte and lithium-ion secondary batteries

Active Publication Date: 2021-08-20
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the current circumstances, increasing the working voltage of the battery cell is one of the effective ways to increase the energy density, but the stability under high voltage, especially the stability of high temperature performance is a huge challenge

Method used

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  • Electrolyte solution additive, electrolyte solution and lithium-ion secondary battery
  • Electrolyte solution additive, electrolyte solution and lithium-ion secondary battery
  • Electrolyte solution additive, electrolyte solution and lithium-ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of the positive electrode sheet of the lithium-ion secondary battery

[0045] The positive electrode active material lithium nickel cobalt manganese oxide (LiNi 0.6 co 0.2 mn 0.2 o 2 ), the conductive agent Super-P, and the binder PVDF are dissolved in the solvent N-methylpyrrolidone at a mass ratio of 96:2.0:2.0 and mixed evenly to make a positive electrode slurry, and then the positive electrode slurry is evenly coated on the current collector aluminum foil , coating amount is 18mg / cm 2 , followed by drying at 85°C, cold pressing, edge trimming, cutting, and stripping, and then drying at 85°C for 4 hours under vacuum, and welding the tabs to make a positive electrode sheet of a lithium-ion secondary battery that meets the requirements.

[0046] (2) Preparation of the negative electrode sheet of the lithium-ion secondary battery

[0047] Negative electrode active material artificial graphite, conductive agent Super-P, thickener CMC, and binder SBR ...

Embodiment 2

[0053] A lithium-ion secondary battery was prepared according to the method of Example 1, except that in the preparation of the electrolyte of the lithium-ion secondary battery (ie step (3)), the amount of the additive compound 1 accounted for 1% of the total mass of the electrolyte.

Embodiment 3

[0055] A lithium-ion secondary battery was prepared according to the method of Example 1, except that in the preparation of the electrolyte of the lithium-ion secondary battery (ie step (3)), the amount of the additive compound 1 accounted for 2% of the total mass of the electrolyte.

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Abstract

The invention provides an electrolyte additive, an electrolyte and a lithium ion secondary battery. The electrolyte additive has a structure shown in formula I, R in formula I 1 , R 2 , R 3 Each independently is a hydrogen atom or a cyano group, R 1 , R 2 , R 3 At least one of them is cyano, R 4 , R 5 Each is independently an alkyl group, and the general formula of the alkyl group is C n h 2n+1 , n=1~8. In the present invention, by adding the additive in the electrolytic solution, the electrolytic solution can form a high-temperature stable and cycle-stable SEI film during charging. It can effectively inhibit the reaction of the electrolyte on the surface of the electrode material, inhibit the dissolution of the positive electrode material metal, improve the high-temperature cycle and storage performance of the lithium-ion battery, and inhibit the gas production during high-temperature storage, thereby improving the overall performance of the battery under high voltage. .

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrolyte solution additive, electrolyte solution and lithium ion secondary battery. Background technique [0002] The proliferation of consumer electronics such as laptops, smartphones, wearables, drones, etc. Lithium-ion batteries are green, high-energy and environmentally friendly batteries that appeared in the 1990s. Because of their advantages such as high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life, they are widely used Applied to mobile phones, notebook computers, camcorders, digital cameras, tablet computers and other portable electronic products that emphasize thin, light, small and multi-functional. But at the same time, the lithium-ion secondary battery needs to have a higher capacity in a limited volume or a limited mass. Therefore, how to improve the energy density of lithium-io...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCY02E60/10Y02P70/50
Inventor 冯绍伟
Owner SVOLT ENERGY TECHNOLOGY CO LTD