A Hierarchical N/S‐Codoped Carbon Anode Fabricated Facilely from Cellulose/Polyaniline Microspheres for High‐Performance Sodium‐Ion Batteries

Hierarchical N/S-codoped carbon microspheres with expanded interlayer distance and enhanced conductivity are fabricated facilely from cellulose/polyaniline composite in a “green” and low-cost route. This material achieves a high reversible capacity of ≈280 mA h g−1 at 30 mA g−1 and superior rate performance of ≈130 mA h g−1 at 10 A g−1, and ultralong cycle life of more than 3000 cycles as an anode material for sodium-ion batteries, holding great promise for economic large-scale energy storage.