Preparation method of positive electrode material of lithium sulfur battery

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve the problem of poor cycle stability, poor electronic conductivity and ionic conductivity of carbon-sulfur complexes , Unfavorable battery high rate performance and other issues, to achieve good conductivity, low production cost, and good crystal shape
CN104659338AInactive Publication Date: 2015-05-27MCNAIR TECH +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MCNAIR TECH
Publication Date
2015-05-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of lithium sulfur batteries, and particularly relates to a preparation method of a positive electrode material of a lithium sulfur battery. The preparation method comprises the following steps: adding a carbon nano tube into a nitrogen source substance solution with the mass concentration not less than 10%, mixing uniformly, transferring into a hydrothermal / solvent thermal reaction kettle for heat preservation, cooling, and washing and drying a reaction product so as to obtain a carbon nitride nano tube; dissolving sulfur into an organic solvent so as to obtain a sulfur contained organic solution, then adding the carbon nitride nano tube obtained in the step 1 into the sulfur contained organic solution, carrying out ultrasonic dispersion for more than 0.5 hour, and performing ultrasound treatment continuously while dropwise adding an extracting agent, wherein the mass ratio of the extracting agent to the organic solvent is (0.5-10) to 1; and then drying, and carrying out freeze drying on a product after the solvent is evaporated by more than a half. Compared with the prior art, the carbon-sulfur compound obtained by the method is good in circulation stability.
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Description

technical field

[0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a preparation method of a positive electrode material of a lithium-sulfur battery. Background technique

[0002] Lithium-sulfur battery is a secondary battery with metallic lithium as the negative electrode and elemental sulfur as the positive electrode. During discharge, the negative electrode reacts as lithium loses electrons and becomes lithium ions, and the positive electrode reacts as sulfur reacts with lithium ions and electrons to form sulfide. The potential difference of the negative electrode reaction is the discharge voltage provided by the lithium-sulfur battery. The specific energy of lithium-sulfur batteries can theoretically reach 2600Wh / Kg, which is much larger than any commercial secondary batteries used at this stage. In addition to the advantages of high energy density, lithium-sulfur batteries also have the advantages of less envir...

Claims

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