Preparation and application of lithium-sulfur battery positive electrode composite material

A technology of lithium-sulfur batteries and composite materials, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., to achieve the effects of good battery cycle performance, good cycle stability, and novel substrate materials
CN106450237AInactive Publication Date: 2017-02-22FUZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FUZHOU UNIV
Publication Date
2017-02-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides preparation and application of a lithium-sulfur battery positive electrode composite material. A titanate precursor is synthesized by a simple one-step hydrothermal method; titanate is stirred for 7 to 8 days in water bath with the temperature of 60 to 80 DEG C to synthesize anatase-phase TiO2 mesocrystal; and TiO2 mesocrystal and S are compounded to prepare the lithium-sulfur battery positive electrode material. A lithium-sulfur battery obtained by the prepared TiO2 mesocrystal and S composite material serving as a positive electrode has excellent cycle stability, wherein the capacity maintains to be 327.4 mAh / g when the lithium-sulfur battery performs charging and discharging circulation for 500 circles and the current density is 1670 mA / g; and the average capacity of each circle is only 0.085 percent.
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Description

technical field

[0001] The invention belongs to the field of supercapacitors, and in particular relates to the preparation and application of a lithium-sulfur battery cathode composite material. Background technique

[0002] As a promising battery product in the future, lithium-sulfur batteries have received more and more attention due to their high capacity and energy density. However, over the years, due to the unique electrochemical behavior of lithium-sulfur batteries, the continuous loss of capacity and low Coulombic efficiency have resulted. Porous carbon materials are widely used in lithium-sulfur batteries, and it is believed that the loss of elemental sulfur and polysulfides can be limited by physical adsorption between carbon channels or layers. Although this effect can limit the diffusion of polysulfides in a short period of time, polysulfides will eventually diffuse from the positive electrode to the negative electrode. Therefore, inventing a new substrate mate...

Claims

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