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Lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery, lithium-sulfur technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve problems such as the inability to provide lithium sources

Inactive Publication Date: 2015-05-27
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to: address the deficiencies of the prior art, and provide a new lithium-sulfur battery and the preparation method of the lithium-sulfur battery: the lithium-sulfur battery cathode contains sulfur-containing active material, and the anode is carbon material, alloy Lithium-poor materials such as carbon materials, alloy materials and other anode active materials are used to solve many problems of lithium metal anodes, and lithium-rich electrodes are enriched with lithium to solve the problem that sulfur cathodes cannot provide lithium sources, and then in the electrolyte Introduce film-forming additives to form a high-quality solid electrolyte film (SEI film) on the surface of the anode active material carbon material, alloy material and other particles, and finally prepare a lithium-sulfur battery with excellent performance

Method used

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  • Lithium-sulfur battery and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 , Preparation of cathode sheet: same as Comparative Example 1.

[0036] Preparation of anode sheet: graphite is used as the anode active material, mixed with conductive agent, adhesive and solvent to obtain a slurry, and then the anode sheet to be wound is obtained through coating, cold pressing, slitting, welding and other processes .

[0037]Preparation of lithium-rich anode sheet: choose metal lithium strip as lithium-rich material to provide lithium source, and cold-press composite the metal lithium strip and the above-mentioned anode sheet, and control the surface pressure to 1MPa, so that the metal lithium strip is tightly composited on the surface of the anode coating ( The empty current collector region does not need lithium-rich) to obtain a lithium-rich anode.

[0038] Preparation of the finished lithium-sulfur cell: wind the above-mentioned cathode sheet, separator, and lithium-rich anode sheet to obtain a bare cell, then select aluminum-plastic ...

Embodiment 2

[0040] Example 2 , different from Embodiment 1, this embodiment includes the following steps:

[0041] Electrolyte solution configuration: weigh and prepare the liquid according to the mass ratio relationship of 1,3-dioxolane: ethylene glycol dimethyl ether: vinylene carbonate = 50:50:1, and then add bis(trifluoromethylsulfonate Lithium imide was stirred, and the electrolyte E2 with lithium bis(trifluoromethylsulfonyl)imide concentration of 1mol / L was prepared for subsequent use.

[0042] Others are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0043] Example 3 , different from Embodiment 1, this embodiment includes the following steps:

[0044] Electrolyte solution configuration: Weigh and prepare the liquid according to the mass ratio relationship of 1,3-dioxolane: ethylene glycol dimethyl ether: fluoroethylene carbonate = 50:50:5, and then add bis(trifluoromethyl Lithium sulfonyl)imide was stirred, and the electrolyte E3 with a lithium bis(trifluoromethylsulfonyl)imide concentration of 1 mol / L was prepared for future use.

[0045] Others are the same as in Example 1, and will not be repeated here.

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Abstract

The invention belongs to the field of lithium-sulfur batteries and particularly relates to a lithium-sulfur battery and a preparation method thereof. The lithium-sulfur battery comprises a cathode, an anode, an isolation film, an electrolyte and an outer packing, wherein the cathode and the anode adopt lithium-deficient electrode materials; by using a carbon material, an alloy type material and other anode active substances, many problems of a lithium metal anode are solved, and through a lithium-rich technology, lithium-rich treatment is performed on the electrode, so that the problem that the sulfur cathode cannot provide a lithium source is solved; and a film-forming additive is introduced into the electrolyte, so that the anode active substance, such as the carbon material, the alloy type material and other particles can form a high-quality solid electrolyte film (SEI film) on the surface, and the lithium-sulfur battery with excellent performance is finally prepared.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, in particular to a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Since 1991, carbon materials were creatively used in the field of lithium-ion batteries and brought about revolutionary changes in this field, that is, after multiple charging and discharging efficiently and safely, they have been widely used in mobile phones, portable computers, and electric batteries. Cars, digital cameras, I-pad and other portable electronic products. However, with the improvement of people's requirements for these portable life, traditional lithium batteries can no longer meet the needs of human beings. Therefore, next-generation lithium batteries with high specific energy, high safety, long service life and low cost are expected to be high. [0003] The development of new cathode materials is the key to improving the specific energy of the battery: the sulfur ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/38H01M4/587H01M10/0567H01M10/058
CPCH01M4/38H01M4/5815H01M4/583H01M4/60H01M4/602H01M10/0525H01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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