Preparation method of lithium-sulfur battery diaphragm

A technology for lithium-sulfur batteries and diaphragms, which is applied in the field of preparation of lithium-sulfur battery diaphragms, can solve serious problems such as the inability to take into account the shuttle effect, and achieve the effect of taking into account the thickness, suppressing the shuttle effect, and improving electrical performance
CN110911618AInactive Publication Date: 2020-03-24长沙凯泽工程设计有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
长沙凯泽工程设计有限公司
Publication Date
2020-03-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a preparation method of a lithium-sulfur battery diaphragm. The method comprises: firstly, blending and weaving glass fibers, polyamide fibers and water-soluble vinylon fibers into a base film; securing basic strength, then preparing gel slurry from polyurethane fibers, nano microcrystalline cellulose, carboxyl polystyrene microspheres, sodium lignin sulfonate, tetraethyl orthosilicate and the like as raw materials, and extruding the gel slurry to two surfaces of the base membrane; finally, obtaining the diaphragm suitable for the lithium-sulfur battery through a seriesof post-treatment. The thickness, the strength, the porosity and the like are considered, the shuttle effect is inhibited, and the electrical property of the lithium-sulfur battery is greatly improved.
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Description

technical field

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

[0002] With the popularity of portable electronic devices and electric vehicles, traditional lithium-ion batteries have been unable to meet the high energy density requirements of reversible batteries. Lithium-sulfur battery is a promising new battery system because of its high theoretical specific capacity (1675mAh / g) and energy density (2600Wh / kg), abundant raw materials, good environmental protection, and low cost.

[0003] The charge-discharge process of lithium-sulfur batteries is a multi-electron reaction accompanied by a complex phase transition process. When the electrochemical reaction occurs, the intermediate discharge product dissolves in the electrolyte and circulates between the positive and negative electrodes. However, lithium polysulfide, an intermediate product formed d...

Claims

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