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Electrolyte containing tricyanobenzene and lithium ion secondary battery containing electrolyte

A technology of electrolyte and trimellitonitrile, which is applied in the field of designing lithium-ion battery preparation, can solve problems such as electrolyte oxidation, and achieve the effects of inhibiting catalytic decomposition, improving high-temperature storage performance, and inhibiting dissolution.

Inactive Publication Date: 2016-05-18
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the positive electrode active material with high nickel content has a high charging cut-off voltage, it will increase the oxidation management of the positive electrode sheet, causing the oxidation problem of the electrolyte to be more serious.

Method used

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  • Electrolyte containing tricyanobenzene and lithium ion secondary battery containing electrolyte
  • Electrolyte containing tricyanobenzene and lithium ion secondary battery containing electrolyte
  • Electrolyte containing tricyanobenzene and lithium ion secondary battery containing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) The cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mass ratio EC:EMC:DEC=3:5:2 Mix, and use molecular sieve, calcium hydride, lithium hydride to purify and remove impurities and water;

[0028] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the solvent obtained in step (1), the final concentration is 1.0mol / L, and stir evenly to obtain a common electrolyte;

[0029] (3) Adding trifluoroethyl trifluoromethanesulfonate to the common electrolyte prepared in step (2), the dosage being 1.5% of the electrolyte quality; obtaining a high-voltage electrolyte for lithium-ion batteries.

Embodiment 2

[0031] (1) The cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mass ratio EC:EMC:DEC=3:5:2 Mixing, using molecular sieves, calcium hydride, lithium hydride to purify and remove impurities and water;

[0032] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the solvent obtained in step (1), the final concentration is 1mol / L, stir evenly, and make common electrolyte;

[0033] (3) Adding trifluoroethyl trifluoromethanesulfonate to the ordinary electrolyte prepared in step (2), the dosage being 0.5% of the electrolyte mass; obtaining a high-voltage functional electrolyte for lithium-ion batteries.

Embodiment 3

[0035] (1) The cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mass ratio EC:EMC:DEC=3:5:2 Mixing, using molecular sieves, calcium hydride, lithium hydride to purify and remove impurities and water;

[0036] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the solvent obtained in step (1), the final concentration is 1.0mol / L, stir evenly, and make common electrolyte;

[0037] (3) adding trifluoroethyl trifluoromethanesulfonate to the ordinary electrolyte prepared in step (2), the dosage being 1% of the electrolyte mass; obtaining a boron-containing film-forming functional electrolyte for lithium-ion batteries.

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PUM

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Abstract

The invention discloses an electrolyte containing 1,3,5-tricyanobenzene. The electrolyte comprises an organic solvent, conductive lithium salt and an additive, wherein the additive is 1,3,5-tricyanobenzene; the organic solvent is selected from more than one of cyclic carbonate and linear carbonate; the use mass of the additive is equivalent to 0.1%-10% of the total mass of the lithium salt and the organic solvent. Tricyanobenzene and transition metal have higher complexation, dissolving out of transition metal of a positive plate can be effectively inhibited, the transition metal can be enriched on the surface of the positive plate to form a protecting film, catalytic decomposition of electrolyte components on the surface of the positive plate is inhibited, and the high-temperature storage performance of the secondary battery is improved.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion batteries, in particular to an electrolyte containing benzenetrinitrile and a lithium-ion secondary battery containing the electrolyte. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices due to their advantages such as high specific energy, small size, light weight, no memory effect, and long cycle life. However, with the rapid development of portable electronic products, higher and higher requirements are placed on the specific energy of lithium ions. [0003] However, in a fully charged state, the entire chemical system of the lithium-ion secondary battery has extremely high chemical activity. When electronic products are used continuously or the ambient temperature rises, the lithium-ion secondary battery may be in a high temperature state. At this time, the metal oxide as the positive electrode active material shows very strong oxidatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 王再盛仰永军李斌万华平许梦清李伟善
Owner GUANGZHOU TINCI MATERIALS TECH
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