Biomass-Derived N/S Co-Doped Carbon with Integrated Disordered and Ordered Structures for High-Performance Dual-Ion...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Dual-ion batteries (DIBs) offer high voltage, low cost, and eco-friendliness.
• Carbonaceous materials are promising anodes but face challenges in capacity, rate performance, and lifespan due to limited active sites and structural instability.

Purpose of the Study:

• To develop high-performance anodes for DIBs using biomass-derived N/S co-doped porous carbons (N/S-PCs).
• To address the limitations of traditional carbonaceous anodes in DIBs.

Main Methods:

• Synthesis of N/S co-doped porous carbons from biomass.
• Characterization of the unique hybrid structure (amorphous and graphitized domains).
• Theoretical calculations to understand doping effects on conductivity and Li+ storage.
• Fabrication and testing of proof-of-concept DIBs.

Main Results:

• Optimized N/S-PCs exhibit enhanced structural stability and Li+ storage.
• N/S co-doping improves ionic/electronic conductivity, Li+ adsorption, and provides active sites.
• Achieved ultra-high specific discharge capacity (424.3 mAh g⁻¹).
• Demonstrated long cycling life (2100 cycles) with minimal degradation (0.00015 per cycle).
• Exhibited low self-discharge and high charging safety.

Conclusions:

• N/S-PCs are exemplary advanced carbon materials for high-performance DIB anodes.
• The hybrid structure and co-doping strategy significantly boost electrochemical performance.
• This work highlights the potential of N/S-PCs in next-generation energy storage devices.