Tungsten diselenide / nitrogen-doped porous carbon composite material, modified separator and preparation method and application thereof
By coating a membrane with a tungsten diselenide/nitrogen-doped porous carbon composite material, the problem of polysulfide shuttle effect in sodium-sulfur batteries is solved by utilizing the bonding between polar tungsten diselenide and polysulfides and the adsorption of porous carbon, thereby improving the electrochemical performance and stability of the battery.
CN119774556BActive Publication Date: 2025-11-25CHINA ENERGY GRP NINGXIA COAL IND CO LTD +1
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Patent Information
- Application Number
- CN202411743248.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2044-11-29
AI Technical Summary
Technical Problem
In existing sodium-sulfur batteries, the shuttle effect of polysulfides leads to severe loss of active materials and rapid capacity decay, and the existing modified separators have limited effectiveness.
Method used
The membrane was modified using a tungsten diselenide/nitrogen-doped porous carbon composite material. The polar tungsten diselenide bonded to soluble polysulfides, and the polysulfides were adsorbed by the van der Waals forces and active sites of porous carbon, thus suppressing their shuttle effect.
Benefits of technology
It significantly improves the electrochemical performance and stability of room temperature sodium-sulfur batteries, enhances the utilization rate of active materials, and inhibits the dissolution and diffusion of polysulfides.
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Abstract
The application provides a tungsten diselenide / nitrogen-doped porous carbon composite material, a modified diaphragm and a preparation method and application thereof. The tungsten diselenide / nitrogen-doped porous carbon composite material comprises nitrogen-doped porous carbon, and the pore channel of the nitrogen-doped porous carbon is filled with tungsten diselenide; wherein the mass ratio of tungsten diselenide to carbon in the nitrogen-doped porous carbon is (10-30):(90-70), and the doping amount of nitrogen in the tungsten diselenide / nitrogen-doped porous carbon composite material is 1-5 at.%. The application inhibits the shuttle effect caused by the dissolution of polysulfide into an organic electrolyte in the room-temperature sodium-sulfur battery cycle process by modifying the diaphragm with the tungsten diselenide / nitrogen-doped porous carbon composite material.
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