Constructing ultramicropore structures in hard carbon via low-temperature force-field-induced esterification reactions for enhancing sodium storage

Low-temperature (900 °C) force-field (20 MPa) induced esterification reactions were proposed to prepare HC rich in ultramicropores (0.4-0.7 nm). HC-20 exhibits a large pore volume and a small entrance diameter, which increases reversible capacity.