一种多硫化磷表面改性的红磷 / 碳复合材料及其制备方法和应用
By generating a polysulfide phosphorus layer on the surface of the red phosphorus/carbon composite material, an artificial SEI layer of Na3PS4 is formed, which solves the problems of volume expansion and SEI layer instability of the red phosphorus/carbon composite material and improves the electrode stability and electrochemical performance of sodium-ion batteries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WUHAN UNIV OF TECH
- Filing Date
- 2022-12-21
- Publication Date
- 2026-07-17
AI Technical Summary
When red phosphorus/carbon composite materials are used as anode materials for sodium-ion batteries, the excessive volume expansion of the red phosphorus on the surface and the instability of the solid electrolyte interphase (SEI) layer lead to rapid battery failure.
By growing a polysulfide phosphorus layer on the surface of a red phosphorus/carbon composite material, a three-layer structure of carbon-red phosphorus-polysulfide phosphorus is formed, generating ionically conductive but electronically insulating Na3PS4 as an artificial SEI layer, which suppresses electrode expansion and improves ion conductivity and electronic insulation.
It significantly suppressed the volume expansion of the red phosphorus/carbon composite material, improved the stability of the electrode and the sodium ion conductivity, and enhanced the cycle performance and safety of the battery.
Smart Images
Figure CN115939352B_ABST