Black phosphorus composites with engineered interfaces for high-rate high-capacity lithium storage

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• High-rate lithium-ion batteries are essential for electric vehicles, offering rapid charging and extended driving range.
• Current high-rate batteries often compromise on energy capacity and long-term stability.
• Developing advanced anode materials is key to overcoming these limitations.

Purpose of the Study:

• To investigate black phosphorus (BP) as an active anode material for high-rate, high-capacity lithium storage.
• To enhance the stability and ion transport properties of BP-based anodes.
• To enable faster charging and improved energy density in lithium-ion batteries.

Main Methods:

• Utilized black phosphorus (BP) as the active anode material.
• Formed covalent bonds between BP and graphitic carbon to stabilize the structure.
• Coated BP-graphite particles with electrolyte-swollen polyaniline to create a stable solid-electrolyte interphase.
• Evaluated the electrochemical performance, including capacity, rate capability, and cycling stability.

Main Results:

• The composite anode demonstrated high capacity and excellent rate performance.
• Covalent bonding with graphite prevented BP edge reconstruction, ensuring open pathways for lithium-ion entry.
• Polyaniline coating provided a stable solid-electrolyte interphase, inhibiting detrimental side reactions.
• The anode exhibited superior cycling endurance, maintaining performance over extended charge-discharge cycles.

Conclusions:

• Black phosphorus, when engineered with graphitic carbon and polyaniline coating, offers a promising solution for high-performance lithium-ion battery anodes.
• This composite anode achieves a desirable balance of high capacity, fast charging, and long cycle life.
• The developed material addresses key challenges in electric vehicle battery technology.