Fig. 6: Diagram illustrating the pore mouth size-dependent solvation structure and defects-dependent sodium storage properties.
From: Redefining closed pores in carbons by solvation structures for enhanced sodium storage

The crystallites are shown as blue lines, the SEI is shown as orange, the inner Helmholtz layer (IHP) is pointed out by the black bidirectional arrows and the defects are shown as the vacancies in Hexatomic rings. The three solvation structures inside the pores are SSIP solvent-separated ion pairs, CIP contact ion pairs, and AGG anion aggregates.