A Simple and Efficient Method for Preparing Lithium-Sulfur Battery Positive Plates

A positive electrode plate and sheet technology, applied in the field of electrochemistry, can solve the problems of electrode collapse and capacity attenuation of lithium-sulfur batteries, and achieve the effects of low production cost, time saving and simple synthesis route.

Active Publication Date: 2019-12-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Third, the collapse of the electrodes is a serious problem that can lead to a rapid capacity fading of lithium-sulfur batteries.
This method has not yet been applied to industrial production, and it is a suitable method to prepare nearly 100% sulfur nickel foam cathodes on flexible substrates.

Method used

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  • A Simple and Efficient Method for Preparing Lithium-Sulfur Battery Positive Plates
  • A Simple and Efficient Method for Preparing Lithium-Sulfur Battery Positive Plates
  • A Simple and Efficient Method for Preparing Lithium-Sulfur Battery Positive Plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] At room temperature (20°C), put a nickel foam disk with a radius of 7mm in a glass dish with a volume of 20ml, and then drop 0.02ml of carbon disulfide with a concentration of 0.1g / ml sulfur into the nickel foam disk. Transfer the glass dish to an environment of 30°C, and after 10 minutes, the carbon disulfide is completely volatilized, and the sulfur is completely precipitated in the nickel foam. The nickel foam with sulfur was pressed into thin sheets under 5MPa. The pressed foamed nickel sheet is evenly coated with a layer of carbon layer on its surface with a charcoal pencil, and the coated sheet is pressed again under 7MPa, so that the positive electrode sheet is obtained.

Embodiment 2

[0039] At room temperature (20°C), put a nickel foam disk with a radius of 7mm in a glass dish with a volume of 20ml, and then drop 0.02ml of carbon disulfide with a concentration of 0.15g / ml sulfur into the nickel foam disk. Transfer the glass dish to an environment of 30°C, and after 10 minutes, the carbon disulfide is completely volatilized, and the sulfur is completely precipitated in the nickel foam. The nickel foam with sulfur is pressed into thin sheets under 6MPa. The pressed foamed nickel sheet is evenly coated with a layer of carbon layer on its surface with a charcoal pencil, and the coated sheet is pressed again under 8MPa, so that the positive electrode sheet is obtained.

Embodiment 3

[0041] At room temperature (20°C), put a nickel foam disk with a radius of 7mm in a glass dish with a volume of 20ml, and then drop 0.02ml of carbon disulfide with a concentration of 0.1g / ml sulfur into the nickel foam disk. Transfer the glass dish to an environment of 40°C, and after the carbon disulfide is completely volatilized after standing for 15 minutes, the sulfur is completely precipitated in the nickel foam. The nickel foam with sulfur was pressed into thin sheets under 5MPa. The pressed foamed nickel sheet is evenly coated with a layer of carbon on its surface with a charcoal pencil, and the coated sheet is pressed again under 6MPa, so that the positive electrode sheet is obtained.

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Abstract

The invention discloses a preparation method of a lithium-sulfur cathode plate, comprising: using a ternary mixture material (Ni, S and C); the first component uses foam nickel as electronic conductive metal frame and can provide supporting, the second component may employ sulfur particles as an active material to transfer and storage energy and act as a cathode reactive active material, and the third component is used for inhibiting the dispersion of polylithium sulfide to inhibit shuttle effect; the method for preparing the cathode plate is an environment-friendly simple traditional physical tableting method. Owing to the ternary mixture frame, the lithium-sulfur cathode plate exhibits high electrochemical properties. The method has the advantages that the raw materials are easy to obtain, the production cost is low, a synthetic route is simple, reaction conditions are mild, and the production efficiency is high.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method of a lithium-sulfur battery cathode sheet. Background technique [0002] With the reduction of non-renewable fossil fuels and concerns about serious environmental pollution, more and more renewable and clean energy sources have replaced traditional energy materials. The use of battery systems to store surplus electricity has been developed over the past decade. So far, lithium-ion batteries have successfully enabled the widespread use of portable electronic devices and power tools. Despite these achievements, Li-ion batteries suffer from high technical cost, safety, and limited energy density. To solve these annoying problems and develop next-generation energy storage systems, lithium-sulfur batteries have begun to accelerate development. Sulfur is also a cheap and environmentally friendly material, and sulfur is suitable for large-scale prepara...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M4/139H01M4/04H01M4/38H01M4/62H01M4/66H01M4/80H01M10/052
CPCH01M4/0404H01M4/0416H01M4/0435H01M4/139H01M4/38H01M4/628H01M4/661H01M4/808H01M10/052Y02E60/10
Inventor李雪锋陈仕谋宋玉婷凡俊田汶凯华
OwnerINST OF PROCESS ENG CHINESE ACAD OF SCI