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A kind of electrolyte solution and lithium secondary battery

A lithium secondary battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems that the high-temperature cycle performance and low-temperature discharge capacity of the battery are not significantly improved, and the high-temperature storage gas production cannot be suppressed, so as to achieve the effect of improving the high-temperature cycle

Active Publication Date: 2021-08-27
GUANGZHOU TINCI MATERIALS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in pouch batteries, the silicocyano compound additive with structural formula 2 cannot suppress gas production during high-temperature storage, and does not significantly improve the high-temperature cycle performance and low-temperature discharge capacity of the battery.

Method used

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  • A kind of electrolyte solution and lithium secondary battery
  • A kind of electrolyte solution and lithium secondary battery
  • A kind of electrolyte solution and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 The preparation method of high-voltage lithium-ion soft pack battery is as follows:

[0029] According to the capacity design of the battery, the capacity of the positive and negative electrode materials determines the coating area density. The positive electrode active material is a high-voltage lithium cobalt oxide material purchased from Xiamen Tungsten; the negative electrode active material is artificial graphite purchased from Shenzhen Beiterui; the separator is a PE material with a thickness of 20 μm purchased from Xingyuan. Coated ceramic diaphragm;

[0030] The positive electrode preparation step is: mix lithium cobaltate, conductive carbon black and binder polyvinylidene fluoride in a mass ratio of 96.8:2.0:1.2, and disperse them in N-methyl-2-pyrrolidone to obtain positive electrode slurry, Apply the positive electrode slurry evenly on both sides of the aluminum foil,

[0031] After drying, calendering and vacuum drying, the positive electrode ...

Embodiment 2～6

[0037] It is substantially the same as Example 1, except that the weight percent of the additive shown in Formula 1 is adjusted to 0.5%, 1%, 2%, 3% and 5%.

Embodiment 7

[0039] Substantially the same as Example 4, the difference is that the organic solvent in the electrolyte is adjusted to ethylene carbonate (EC), propylene carbonate (PC), ethyl propionate (EP) and propyl propionate (PP), and the mass The ratio is adjusted to 15:20:15:50.

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Abstract

The invention relates to the technical field of lithium ion batteries, and provides an electrolytic solution, which includes a non-aqueous solvent, lithium salt and additives. The additive provided by the present invention has the structure shown in the following formula 1: by adding the additive to the high-voltage electrolyte, the high-temperature cycle, high-temperature storage and low-temperature discharge performance of the high-voltage battery can be significantly improved. Meanwhile, the invention also provides a lithium secondary battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte solution and a lithium secondary battery. Background technique [0002] CN202010438712.7 discloses a high-voltage lithium-ion battery and its electrolyte and electrolyte additive. The high-voltage lithium-ion battery silicocyanide electrolyte additive provided by the invention is a silicocyano compound, with silicon as a stable group. Through the anchoring effect, the complete oxidation of the cyano functional group and the cross-reduction reaction with the negative electrode are inhibited under high voltage, so as to avoid the deterioration of the battery. In addition, the silicon element can also increase the wettability of the electrolyte. The cyano functional group in the silicon cyano compound can eliminate the free hydrogen in the electrolyte, reduce the moisture in the electrolyte and eliminate HF, reduce the hydrolysis of LiPF6 and the damage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2300/0025Y02E60/10
Inventor 李帅龙玉朝琛周立马美鹏
Owner GUANGZHOU TINCI MATERIALS TECH
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