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Electrolyte and secondary battery

An electrolyte and compound technology, which is applied in secondary batteries, secondary battery repair/maintenance, organic electrolytes, etc., can solve the problems of secondary battery impedance increase, unusable, secondary battery failure, etc., and improve the anti-overcharge performance effect

Inactive Publication Date: 2018-04-17
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the safety performance of secondary batteries under high voltage, such as overcharge prevention performance, is facing great challenges
Common anti-overcharge additives such as biphenyl have good anti-overcharge performance, but below 4.2V, biphenyl will undergo electropolymerization, resulting in a significant increase in the impedance of the secondary battery, causing the secondary battery to fail
Therefore, under high voltage, some common anti-overcharge additives such as biphenyl, cyclohexylbenzene, etc. cannot be used, and it is necessary to find anti-overcharge additives with higher electropolymerization voltage

Method used

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  • Electrolyte and secondary battery
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  • Electrolyte and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of electrolyte

[0038] In the drying room, EC, PC, and DEC are mixed according to the mass ratio of EC:PC:DEC=1:1:1 to obtain a mixed organic solvent, and then fully dried lithium salt LiPF 6 Dissolve in the above-mentioned mixed organic solvent, then add compound 1 (namely benzonitrile), compound 7 (namely vinyl sulfate) and fluoroethylene carbonate (FEC) thereinto, stir evenly, and obtain electrolyte solution. Among them, in the electrolyte, the mass fractions of compound 1, compound 7 and FEC are 1%, 0.2% and 2%, respectively, LiPF 6 The concentration is 1mol / L.

[0039] (2) Preparation of positive electrode sheet

[0040] Weigh 1.42kg of solvent N-methyl-2-pyrrolidone (NMP), 1.2kg of binder polyvinylidene fluoride (PVDF) with a mass fraction of 10%, 0.16kg of conductive graphite and 7.2kg of positive electrode active material LiCoO 2 Thoroughly mix and stir to obtain the positive electrode slurry, then evenly coat the positive electrode slurry on...

Embodiment 2

[0046] The preparation process of the lithium-ion secondary battery is the same as in Example 1, except that in the electrolyte, the mass fraction of compound 1 is 1%, the mass fraction of compound 7 is 0.5%, and the mass fraction of FEC is 2%.

Embodiment 3

[0048] The preparation process of the lithium-ion secondary battery is the same as in Example 1, except that in the electrolyte, the mass fraction of compound 1 is 1%, the mass fraction of compound 7 is 1%, and the mass fraction of FEC is 2%.

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Abstract

The invention provides an electrolyte and a secondary battery. The electrolyte comprises an electrolyte salt, an organic solvent and additives, wherein the additives comprise a benzene single nitrilecompound, cyclic sulfate and fluoroethylene carbonate. When the electrolyte disclosed in the invention is applied to the secondary battery, the anti-overcharging performance of the secondary battery can be obviously improved; and meanwhile, the secondary battery also has relatively low cycle impedance and relatively high cycle capacity retention ratio.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrolyte solution and a secondary battery. Background technique [0002] Secondary batteries, especially lithium-ion secondary batteries, have unique advantages such as high energy density, high working voltage, low self-discharge rate, long cycle life, and no pollution. They have been widely used as power sources in electronic products such as cameras and mobile phones. In recent years, with the rapid development of smart electronic products, higher requirements have been placed on the battery life of secondary batteries. In order to increase the energy density of secondary batteries, developing high-voltage secondary batteries is one of the effective methods. At present, the secondary battery with an operating voltage above 4.35V has become a research focus of many scientific research institutes and enterprises. However, the safety performance of the secondary battery...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 唐超陈培培付成华彭昌志
Owner NINGDE AMPEREX TECH
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