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Sulfur-containing electrolyte with film forming function for lithium ion battery as well as preparation method and application thereof

A lithium-ion battery and electrolyte technology, applied in the field of sulfur-containing film-forming functional electrolyte and preparation, can solve the problems of large irreversible capacity and high loss, and achieve the effect of improving the initial discharge capacity

Inactive Publication Date: 2011-11-02
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium-ion battery prepared by the functional electrolyte containing this substance will lose more Li in the first cycle. + , leading to a large irreversible capacity

Method used

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  • Sulfur-containing electrolyte with film forming function for lithium ion battery as well as preparation method and application thereof
  • Sulfur-containing electrolyte with film forming function for lithium ion battery as well as preparation method and application thereof
  • Sulfur-containing electrolyte with film forming function for lithium ion battery as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) The cyclic carbonate solvent propylene carbonate (PC) and the linear carbonate solvent dimethyl carbonate (DMC) are mixed according to the mass ratio PC:DMC=1:1, and adopt Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0032] (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;

[0033] (3) Add propenyl-1,3-sultone to the common electrolyte prepared in step (2), the consumption of propenyl-1,3-sultone is 1% of the electrolyte quality; Sulfur-containing film-forming functional electrolyte for lithium-ion batteries.

Embodiment 2

[0035] (1) The cyclic carbonate solvent propylene carbonate (PC) and the linear carbonate solvent dimethyl carbonate (DMC) are mixed according to the mass ratio PC:DMC=1:1, using Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0036] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the solvent obtained in step (1), the final concentration is 0.8mol / L, stir evenly, and make common electrolyte;

[0037] (3) Add propenyl-1,3-sultone to the common electrolyte prepared in step (2), and the consumption of propenyl-1,3-sultone is 2% of the electrolyte quality; Sulfur-containing film-forming functional electrolyte for lithium-ion batteries.

Embodiment 3

[0039] (1) The cyclic carbonate solvent propylene carbonate (PC) and the linear carbonate solvent dimethyl carbonate (DMC) are mixed according to the mass ratio PC:EMC=1:1, using Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0040] (2) At room temperature, the conductive lithium salt LiPF 6Dissolve in the solvent obtained in step (1), the final concentration is 1.0mol / L, stir evenly, and make common electrolyte;

[0041] (3) Add propenyl-1,3-sultone to the common electrolyte prepared in step (2), and the consumption of propenyl-1,3-sultone is 5% of the electrolyte quality; Sulfur-containing film-forming functional electrolyte for lithium-ion batteries.

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Abstract

The invention provides a sulfur-containing electrolyte with a film forming function for a lithium ion battery as well as a preparation method and application thereof. The sulfur-containing electrolyte with a film forming function is prepared by adding a functional additive to a common electrolyte, wherein the added function additive accounts for 1-5% of the common electrolyte; the common electrolyte contains a cyclic carbonate solvent, a linear carbonate solvent and conductive lithium salts; and the functional additive is one or two of 1,3-propanesultone or propenyl-1, 3-sultone. The functional additive has a higher reduction potential, can form a compact and stable SEI film in the initial charge process, thus restraining cyclic carbonate from co-intercalating towards a graphite electrode effectively, enlarging the application range of cyclic carbonate, improving the initial charge capacity, the cycle life and the high-low temperature property of the battery effectively. The sulfur-containing electrolyte with a film forming function can be used for preparing a lithium ion battery and the prepared lithium ion battery has good charge-discharge performance.

Description

technical field [0001] The invention relates to the field of manufacturing lithium-ion batteries, in particular to a sulfur-containing film-forming functional electrolyte for lithium-ion batteries, a preparation method and application thereof. Background technique [0002] Energy shortage and environmental pollution are the two most concerned problems in the world today. Due to its excellent characteristics (high working voltage, high specific capacity, long cycle life, environmental friendliness, and no memory effect), lithium-ion batteries have become the fastest-growing and most valued new high-energy batteries. It has begun to show a huge advantage that cannot be replaced. [0003] Lithium-ion batteries are mainly composed of positive and negative electrode materials, separators, and electrolyte materials in structure. At present, the anode materials of lithium-ion batteries on the market are mainly lithium cobalt oxide and lithium manganese oxide, and a few of them us...

Claims

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Application Information

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IPC IPC(8): H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 李斌李伟善许梦清李本臻
Owner SOUTH CHINA NORMAL UNIVERSITY
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