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Electrolyte and secondary battery

A technology of electrolyte and electrolyte salt, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of secondary battery cycle performance, high temperature storage performance, safety performance, and poor rate performance, and achieve the effect of improving rate performance

Active Publication Date: 2020-01-17
CONTEMPORARY AMPEREX TECH CO
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Problems solved by technology

[0003] At present, the electrolytes widely used in lithium-ion secondary batteries include those with lithium hexafluorophosphate as the electrolyte salt and a mixture of cyclic carbonates and chain carbonates as organic solvents. However, the above-mentioned electrolytes have many deficiencies, especially Under high voltage, the cycle performance, high temperature storage performance, safety performance and rate performance of the secondary battery are poor

Method used

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  • Electrolyte and secondary battery
  • Electrolyte and secondary battery
  • Electrolyte and secondary battery

Examples

Experimental program
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Effect test

preparation example Construction

[0063] (4) Preparation of separator

[0064] A 16 μm thick polypropylene isolation film (model C210, provided by Celgard) was selected.

[0065] (5) Preparation of lithium-ion secondary battery

[0066] Stack the positive electrode, separator, and negative electrode in order, so that the separator is between the positive and negative electrodes to play a role of isolation, and then wind up to get the bare cell; put the bare cell in the outer packaging foil, and the battery After the core was left standing at a high temperature of 75°C for 24 hours, after the water content met the specifications, the above-mentioned prepared electrolyte was injected into the dried bare cell, and after vacuum packaging, standing, chemical formation, shaping and other processes, the lithium-ion secondary cell was obtained. secondary battery.

[0067] Table 1 The parameters of Examples 1-17 and Comparative Examples 1-15

[0068]

[0069]

[0070] Note: "-" means not included.

[0071] Ne...

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Abstract

An electrolyte and a secondary battery. The electrolyte comprises an electrolyte salt, an organic solvent, and an additive. The organic solvent comprises a carboxylate compound. The additive comprises a dinitrile compound, an aromatic compound overcharge additive, fluoroethylene carbonate and / or vinylene carbonate. When the electrolyte is applied in the secondary battery, the rate performance, normal temperature circulation performance, high temperature storage performance, and overcharge safety performance of the secondary battery may be improved.

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] In the rapidly developing information age, the demand for mobile phones, notebooks, cameras and other electronic products is increasing year by year. As the working power source of electronic products, secondary batteries, especially lithium-ion secondary batteries, have the characteristics of high energy density, no memory effect, and high working voltage, and are gradually replacing traditional Ni-Cd and MH-Ni batteries. However, with the expansion of market demand for electronic products and the development of power and energy storage equipment, people's requirements for secondary batteries continue to increase, and the development of secondary batteries with high energy density and fast charging and discharging has become a top priority. At present, the effective methods are to increase the volt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/056H01M10/0567
CPCH01M10/0525H01M10/056H01M10/0567Y02E60/10
Inventor 王小梅付成华
Owner CONTEMPORARY AMPEREX TECH CO
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