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Electrolyte, lithium ion secondary battery and electric vehicle

An electrolyte and lithium salt technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as electrolyte leakage, lithium-ion battery expansion and deformation, short circuit, etc., to inhibit reaction and improve stability , reduce the effect of side effects

Active Publication Date: 2019-05-21
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problems of lithium ion battery expansion and deformation, internal short circuit, electrolyte leakage and other problems caused by the interaction between the negative electrode and the electrolyte, the positive electrode and the electrolyte at high temperature in the existing lithium ion battery

Method used

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  • Electrolyte, lithium ion secondary battery and electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Preparation of positive electrode sheet for lithium-ion secondary battery

[0048] 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 were dissolved in the solvent N-methylpyrrolidone at a mass ratio of 96:2.0:2.0, mixed evenly to make a positive electrode slurry, and then the positive electrode slurry was evenly coated on the current collector aluminum foil On, the 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 conditions, welding the tabs, and making a positive electrode sheet of a lithium-ion secondary battery that meets the requirements.

[0049] (2) Preparation of lithium-ion secondary battery negative electrode sheet

[0050] Dissolve the negative electrode active material artificial graphite, conductive agent Super-P, thickener CMC, and ...

Embodiment 2

[0056] The lithium ion secondary battery was prepared according to the method of Example 1, except that in step (3) in the preparation of the lithium ion secondary battery electrolyte, the additive was changed to aromatic urea accounting for 1% of the total mass of the lithium ion secondary battery electrolyte Compound 2, the chemical structural formula of aromatic urea compound 2 is:

Embodiment 3

[0058] The lithium ion secondary battery was prepared according to the method of Example 1, except that in step (3) in the preparation of the lithium ion secondary battery electrolyte, the additive was changed to aromatic urea accounting for 3% of the total mass of the lithium ion secondary battery electrolyte Compound 3, the chemical structural formula of aromatic urea compound 3 is:

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Abstract

The invention provides electrolyte, a lithium ion secondary battery and an electric vehicle. The electrolyte comprises a solvent, lithium salt and additives; the additives comprises aromatic urea compound, and the chemical formula of the aromatic urea compound is as shown in description. By importing the aromatic urea compound in the electrolyte, the benzene ring and carbon-oxygen bond in the aromatic urea compound can form a layer of protective film on a surface of the electrode material through chemical reaction. The protective film is stable in the high-temperature environment and the battery circulating process, thereby effectively prohibiting the reaction of the electrolyte on the surface of the electrode material, and prohibiting the digestion of cathode material metal; the high-temperate circulating performance and the storage performance of the lithium ion battery are improved, the gas production in high-temperature storage is prohibited, the comprehensive performance of the battery under high voltage is improved, and then the problem that the battery is in expansive deformation, internal short-circuiting and electrolyte leakage is avoided.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an electrolyte, a lithium ion secondary battery and an electric vehicle. Background technique [0002] In recent years, with the depletion of global petroleum energy and the development of new energy technologies, the lithium-ion battery technology used in automobile power has developed rapidly, and at the same time, higher requirements have been put forward for the performance of lithium-ion secondary batteries. Since the national subsidy policy is linked to energy density, in order to meet the requirements of long-time work, high cruising range, normal use in high and low temperature environments, fast charging and long service life of electric vehicles, it is necessary to develop electric vehicles with higher energy density, more A lithium-ion secondary battery with excellent high-temperature cycle, storage performance and low-temperature rate performance. [0003] For hi...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCY02E60/10
Inventor 冯绍伟
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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