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Lithium sulfur battery cathode material and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem that lithium polysulfide is easy to come out and dissolve in organic electrolyte, it is difficult to complete reversible electrochemical reaction, and affect battery cycle performance, etc. problem, to achieve the effect of improving capacity and cycle performance, promoting formation and stability, and improving cycle performance

Active Publication Date: 2013-08-21
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lithium-sulfur secondary batteries have many advantages, there are still problems to be solved, and their wide application is also limited.
The conductivity of elemental sulfur is poor, and it is difficult to complete the reversible electrochemical reaction; secondly, during the charging and discharging process, the generated lithium polysulfide is easy to come out and dissolve in the organic electrolyte, which affects the cycle performance of the battery

Method used

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  • Lithium sulfur battery cathode material and preparation method thereof
  • Lithium sulfur battery cathode material and preparation method thereof
  • Lithium sulfur battery cathode material and preparation method thereof

Examples

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preparation example Construction

[0056] In a more preferred specific application scheme of the present invention, the preparation method may include:

[0057] (1) Mix sulfur powder and graphene oxide evenly, and react with hydrothermal reaction for 3-10 hours to obtain sulfur / graphene oxide composite, and the product is washed and collected;

[0058] (2) Ultrasonic disperse the product obtained in step (1) in water, add functional polymers or in-situ polymerization of polymer monomers to wrap it, collect the precipitate by centrifugation, and obtain polymer-wrapped sulfur / oxidation after drying Graphene composite;

[0059] (3) Mix the polymer-wrapped sulfur / graphene oxide compound obtained in step (2) with carbon black and binder in a certain proportion, homogenize, coat, and react in vacuum at high temperature to obtain lithium-sulfur battery cathode material.

Embodiment 1

[0061] Example 1 Weigh 10g of sulfur powder and 10g of graphene oxide, dissolve them in 10L of water and stir evenly, place them in water at 150°C for 4-10 hours, then wash the obtained airgel with water, disperse it ultrasonically, and then add 30g of dopamine and ammonia solution in sequence (1 mM), stirred for 2-24h, centrifuged at 5000rpm to separate the precipitate, at 60 o Dry in an oven at C to obtain the active material (for its morphology, see figure 2 ). After that, take 10g of the obtained active material, 1g of carbon black, and 1g of polyacrylic acid, add appropriate amount of water and mix them, stir to make a slurry, apply it on the aluminum foil current collector, and after drying, carry out high-temperature vacuum 200 o C treatment, and then applied as an electrode material for lithium-sulfur batteries, its electrical properties refer to image 3 .

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Abstract

The invention discloses a lithium sulfur battery cathode material and a preparation method thereof. The lithium sulfur battery cathode material comprises a sulfur / graphene oxide compound, wherein a functional polymer layer and an adhesive layer sequentially cover on the sulfur / graphene oxide compound, and at least partial adhesive in the adhesive layer is crosslinked and combined with at least partial functional polymer material in the functional polymer layer. The preparation method of the lithium sulfur battery cathode material comprises the steps of: mixing powdered sulfur with graphene oxide, and carrying out high-temperature water heating on the mixture to form the sulfur / graphene oxide compound; then, packaging the sulfur / graphene oxide compound by the functional polymer material to obtain sulfur / graphene oxide electrode material covered by the functional polymer material; and mixing the sulfur / graphene oxide electrode material with the adhesive and the like, and carrying out high-temperature vacuum crosslinking reaction to obtain the target product. The lithium sulfur battery cathode material effectively improves the capacity and the cycle performance of an electrode; and the preparation technology of the lithium sulfur battery cathode material is simple and good in controllability, and meets the demand of large-scale production.

Description

technical field [0001] The invention relates to a lithium-sulfur battery, in particular to a positive electrode material for a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Secondary lithium-ion batteries (referred to as 'lithium-ion batteries') are the latest generation of rechargeable batteries after nickel-metal hydride batteries. Small size, long life and other advantages, it has become the battery system with the best comprehensive performance at present. Although lithium-ion batteries are the energy supply system with the best comprehensive performance at present, there are still many shortcomings and aspects that need to be improved and improved urgently. A traditional lithium-ion battery consists of a positive electrode, a negative electrode, a separator, an electrolyte, and a battery casing, and the main factor determining the performance of a lithium-ion battery is the electrode material. Compared with lithium-ion battery ...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397H01M4/62
CPCY02E60/10
Inventor 靳健王磊
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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