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Preparation method of a composite sulfur cathode material and its application in all-solid-state lithium-sulfur batteries

A technology of sulfur cathode material and solid electrolyte, which is applied in the field of battery material preparation, can solve the problems of capacity loss, poor electronic conductivity and ionic conductivity of the sulfur composite cathode, and achieves the effect of strengthening the ion conduction path.

Active Publication Date: 2020-07-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of a composite sulfur cathode material and its application in an all-solid-state lithium-sulfur battery in order to solve the problems of poor electronic conductivity and ion conductivity and capacity loss of the existing sulfur composite cathode. The composite sulfur positive electrode has good ion and electron conduction channels, and the all-solid-state lithium-sulfur battery using the composite sulfur positive electrode has good cycle stability and capacity retention, and realizes the high-rate discharge of the solid-state lithium-sulfur battery, which has a strong practical sex

Method used

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  • Preparation method of a composite sulfur cathode material and its application in all-solid-state lithium-sulfur batteries

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specific Embodiment approach 1

[0020] Specific implementation mode 1: This implementation mode records a method for preparing a composite sulfur cathode material, and the specific steps of the method are as follows:

[0021] Step 1: Disperse the sulfur material, solid electrolyte and conductive agent in the solvent according to the mass ratio of 40~60:20~40:5~10, with a solid content of 30~70%, and ball milling for 10~40 h at a speed of 200~ 500r / min, after mixing evenly, dry at 60°C for 24 hours to obtain mixture 1;

[0022] Step 2: Disperse the conductive agent in the solvent with a solid content of 30-70%, and then add it to the mixture 1 at a rate of 5-10% of the mass of the mixture 1, mix it by ball milling for 10-40 hours, and rotate at a speed of 30-50r / min, after mixing evenly, dry at 60°C for 24 h to obtain mixture 2;

[0023] Step 3: Add 2-5% of the mass of the mixture 2 solvated ionic liquid to the mixture 2, grind and mix evenly with a mortar, and obtain the composite sulfur cathode material. ...

specific Embodiment approach 2

[0024] Specific embodiment two: the preparation method of a kind of composite sulfur cathode material described in specific embodiment one, in step 1 and step 2, described solvent is carbon disulfide, acetonitrile, pine water, xylene, tetrahydrofuran, low paraffin, A mixture of one or more of alcohols or ether solvents.

specific Embodiment approach 3

[0025] Specific embodiment three: the preparation method of a composite sulfur cathode material described in specific embodiment one, in step one, the sulfur material is one or more of sulfur or metal sulfide; the metal sulfide for TiS 2 、CoS 2 , FeS 2 , NiS, Cu 2 S, SnS, SnS 2 、MoS 2 、SeS 2 or ZnS.

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Abstract

A preparation method of composite sulfur cathode material and application thereof in all-solid-state lithium-sulfur batteries belong to the technical field of preparation of battery materials. The preparation method comprises: dispersing sulfur material, solid electrolyte and a conductive agent in a solvent to reach a solid content of 30-70%, performing ball milling, mixing well, and drying to obtain mixture I; dispersing a conductive agent in a solvent to reach a solid content of 30-70%, adding the resultant, accounting for 5-10% of the mixture I by mass, into the mixture I, performing ball milling, mixing well, and drying to obtain mixture II; adding a solvated ionic liquid, accounting for 5-10% of the mixture II by mass, into the mixture II, grinding with a mortar, and mixing well to obtain the composite sulfur cathode material. The composite sulfur cathode material is applicable to all-solid-state lithium-sulfur batteries. It is provided herein that little solvated ionic liquid compatible with the components is added to fill gaps of solid particles; in addition, the solvated ionic liquid has ionic conductivity, which helps further enhance an ionic conductive pathway in the sulfur material in an electrode.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a preparation method of a composite sulfur cathode material and its application in an all-solid-state lithium-sulfur battery. Background technique [0002] All-solid-state batteries are a new type of high-safety lithium-ion batteries that replace traditional liquid electrolytes with solid electrolytes. The electrolytes are mainly divided into polymer solid electrolytes and inorganic solid electrolytes. Among them, inorganic solid electrolytes have received extensive attention and rapid development due to their higher safety. At the same time, with the expansion of lithium-ion batteries from smart wearable devices to electric vehicles to large-scale energy storage, higher requirements are put forward for the energy density and power density of batteries. Among many lithium battery systems, all-solid lithium Sulfur batteries are considered to be on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/624H01M10/052H01M2004/028Y02E60/10
Inventor 高云智曹毅张瀚
Owner HARBIN INST OF TECH
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