Tannin-Derived Hard Carbon for Stable Lithium-Ion Anode

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• Graphite anodes limit lithium-ion battery development due to insufficient capacity.
• Biomass-derived hard carbon presents a promising alternative anode material with enhanced lithium storage capabilities.
• Tannin, an abundant plant metabolite, is an underexplored source for hard carbon anode production.

Purpose of the Study:

• To investigate the potential of tannin-derived hard carbon as an anode material for lithium-ion batteries.
• To elucidate the relationship between the structure of tannin-derived hard carbon and its lithium storage performance.
• To enhance the electrochemical performance of tannin-derived hard carbon through graphene oxide compounding.

Main Methods:

• Synthesis of hard carbon from tannin.
• Characterization of hard carbon structure and morphology.
• Electrochemical testing of hard carbon anodes in lithium-ion cells.
• Composite preparation with graphene oxide.

Main Results:

• Tannin-derived hard carbon exhibits favorable microcrystalline structures for lithium storage.
• Compounding with graphene oxide significantly enhances electrolyte contact and charge transfer.
• The optimized PVP-HC anode achieved a capacity of 255.5 mAh g⁻¹ after 200 cycles at 400 mA g⁻¹, with 91.25% capacity retention.

Conclusions:

• Tannin-derived hard carbon is a viable and high-performance anode material for lithium-ion batteries.
• Graphene oxide integration effectively boosts the electrochemical properties of biomass-derived hard carbons.
• This research provides a foundation for utilizing sustainable biomass resources in advanced energy storage solutions.