Red Phosphorus Nanoparticle@3D Interconnected Carbon Nanosheet Framework Composite for Potassium-Ion Battery Anodes

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Red phosphorus (P) is a known storage material for lithium (Li) and sodium (Na) ions.
• Potassium (K) storage in red phosphorus and its reaction mechanisms remain largely unexplored.
• Developing novel anode materials is crucial for advancing potassium-ion battery (KIB) technology.

Purpose of the Study:

• To design and synthesize a novel nanocomposite anode material for KIBs using red phosphorus.
• To investigate the electrochemical performance and potassium storage mechanism of the red phosphorus-based anode.
• To establish red phosphorus as a viable anode material for high-performance KIBs.

Main Methods:

• Synthesis of red phosphorus nanoparticles anchored on a 3D carbon nanosheet framework (red P@CN).
• Electrochemical characterization including capacity, rate capability, and cycling stability tests.
• Analysis using transmission electron microscopy (TEM) and theoretical calculations to elucidate the reaction mechanism.

Main Results:

• The red P@CN composite exhibited a high reversible capacity of 655 mA h g^-1 at 100 mA g^-1.
• Excellent rate capability was observed, retaining 323.7 mA h g^-1 at 2000 mA g^-1.
• A one-electron reaction mechanism (P + K⁺ + e^- → KP) was proposed, with a theoretical capacity of 843 mA h g^-1.

Conclusions:

• The red P@CN composite demonstrates superior electrochemical performance, outperforming existing anode materials for KIBs.
• The study reveals a fundamental understanding of the potassium storage mechanism in red phosphorus.
• This work provides insights into the rational design of high-performance red phosphorus anodes for KIBs.