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Electrolyte of lithium ion battery or lithium sulfur battery

A lithium-ion battery and lithium-sulfur battery technology, applied in lithium batteries, secondary batteries, organic electrolytes, etc., to achieve the effects of increased migration number, higher charge efficiency, and greater conductivity

Active Publication Date: 2019-03-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In lithium-ion batteries, although NCM (811) high-nickel materials and silicon-carbon anodes can improve the energy density of the entire battery, charging at high currents still faces a big problem

Method used

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  • Electrolyte of lithium ion battery or lithium sulfur battery
  • Electrolyte of lithium ion battery or lithium sulfur battery
  • Electrolyte of lithium ion battery or lithium sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the volume ratio of 1:1:1.

[0032] (2) At room temperature, the lithium salt LiPF 6 Dissolve the solvent obtained in step 1 so that the concentration is 1.0 mol / L, stir evenly, and add supramolecular CS as an additive at the same time.

[0033] (3) The mass percentage of the supramolecular CS in the lithium battery electrolyte is 0.1 wt%.

[0034] (4) Test the conductivity and lithium ion migration number of the electrolyte. The lithium ion migration number is 0.44. The conductivity was higher than that in Comparative Example 1, being 13.21 mS / cm.

Embodiment 2

[0036] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the volume ratio of 1:1:1.

[0037] (2) At room temperature, the lithium salt LiPF 6 Dissolve the solvent obtained in step 1 so that the concentration is 1.0 mol / L, stir evenly, and add supramolecular CS as an additive at the same time.

[0038] (3) The mass percentage of supramolecular CS in the electrolyte is 2wt%.

[0039] (4) Test the conductivity and lithium ion migration number of the electrolyte. The lithium ion migration number is 0.6. The conductivity was higher than that in Comparative Example 1, being 15 mS / cm.

Embodiment 3

[0041] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the volume ratio of 1:1:1.

[0042] (2) At room temperature, the lithium salt LiPF 6 Dissolve the solvent obtained in step 1 so that the concentration is 1.0 mol / L, stir evenly, and add supramolecular CS as an additive at the same time.

[0043] (3) The mass percentage of supramolecular CS in the electrolyte is 5wt%.

[0044] (4) Test the conductivity and lithium ion migration number of the electrolyte. The conductivity was higher than that in Comparative Example 1. The lithium ion migration number was 0.7. The conductivity was higher than that in Comparative Example 1, being 16 mS / cm.

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Abstract

The invention discloses an electrolyte of a lithium ion battery or a lithium sulfur battery. The electrolyte comprises an organic supermolecule additive, and organic supermolecules are provided with annular inner hole structures containing electron deficiency spaces. According to the electrolyte of the lithium ion battery or the lithium sulfur battery, the electron deficiency spaces of the organicsupermolecules are fully utilized to capture electron-rich negative ions in the electrolyte, the negative ions and the supermolecules are combined into macromolecules, so that ionization of lithium salt is promoted, the conductivity is improved, meanwhile, transference of anions is limited, the transference number of the lithium ions becomes larger, so that the rate performance of the lithium ionbattery or the lithium sulfur battery can be obviously improved.

Description

technical field [0001] The present invention relates to a lithium-ion battery or a lithium-sulfur battery electrolyte, in particular to an organic supermolecule with a ring inner hole structure containing an electron-deficient space as an additive for a lithium-ion battery or a lithium-sulfur battery to effectively enhance electrical conductivity, The invention relates to increasing the migration number of lithium ions and improving battery rate performance; it belongs to the technical field of lithium batteries. Background technique [0002] Human beings have long relied on traditional fossil energy for development, and are beginning to face many problems (shortage of resources and environmental pollution). It is urgent to seek new energy sources that can meet human needs and have sustainable development. Among new energy sources, lithium batteries have obvious advantages. Lithium batteries have been widely used in our daily life. The rapid development of society now puts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525H01M10/052
CPCH01M10/052H01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 纪效波徐来强王平山侯红帅邹国强
Owner CENT SOUTH UNIV
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