Self-Supported Carbon Nanofiber Films with High-Level Nitrogen and Phosphorus Co-Doping for Advanced Lithium-Ion and Sodium-Ion Capacitors

It is a challenge to achieve the high power/energy densities of portable and flexible energy storage devices. Here, an advanced lithium-ion capacitor (LIC) and sodium-ion capacitor (SIC) were constructed using activated carbon cathodes and self-supported N/P dual-doped carbon nanofiber film (NP-CNF) anodes. The NP-CNF was fabricated through electrospinning assisted by preoxidization and carbonization. The dual-N source (melamine polyphosphate...