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On-surface conversion reaction realizes advanced red phosphorus/carbon anode for high-performance lithium-ion
Yujie Huang1, Hao Li1, Mengjun Wu1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
Journal of Colloid and Interface Science
|June 4, 2024
Summary
Red phosphorus anodes for lithium-ion batteries overcome volume expansion issues using a novel interfacial modification. This method yields stable solid electrolyte surfaces, enhancing battery cycling performance and reaction kinetics.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Red phosphorus (RP) is a promising anode material for lithium-ion batteries (LIBs).
- RP suffers from significant volume expansion and low electronic conductivity during cycling.
- Current methods like vaporization-condensation-conversion (VCC) create RP/C composites but face challenges with superficial RP deposition and unstable solid electrolyte interface (SEI) films.
Purpose of the Study:
- To develop a simple interfacial modification method for red phosphorus anodes.
- To improve the cycling performance and reaction kinetics of RP-based LIBs.
- To create stable RP/C composites with enhanced electrochemical properties.
Main Methods:
- An interfacial modification strategy was employed to eliminate superficial RP.
- A stable surface layer of ion-conducting Li3PS4 solid electrolyte was formed on RP/AC composites.
- Electrochemical performance was evaluated using galvanostatic cycling and rate capability tests.
Main Results:
- The modified RP/AC@S composites demonstrated excellent cycling stability, retaining 926 mAh/g after 320 cycles at 0.2 A/g with 81.6% capacity retention.
- The capacity decay rate was significantly reduced to 0.059% per cycle.
- Full cells utilizing LiFePO4 cathodes exhibited superior cycling performance (62.1 mAh/g after 500 cycles at 1 A/g) and excellent rate capability (81.1 mAh/g at 1.0 A/g).
Conclusions:
- The proposed interfacial modification effectively addresses the limitations of red phosphorus anodes in LIBs.
- The formation of a Li3PS4 solid electrolyte layer enhances cycling stability and reaction kinetics.
- These advancements pave the way for high-performance red phosphorus-based lithium-ion batteries.
