Improvement in the Electrochemical Properties of Intercalated Metal–Organic Framework Electrode Materials by Controlling Crystal Growth

Abstract

The growth of the crystal surface of an intercalated metal–organic framework (iMOF) electrode material, 2,6-naphtalnene dicarboxylate dilithium, which forms an organic–inorganic layered structure, was controlled by selecting the solvent species during synthesis. The crystals synthesized under an aqueous solution exhibited a small reversible capacity because the crystal plane in the horizontal direction relative to the layered structure, grew dominantly and exhibited poor lithium intercalation kinetics. In contrast, the crystals synthesized under methanol exhibited a large reversible capacity because the crystal planes in the vertical direction relative to the layered structure were dominant and exhibited favorable lithium intercalation kinetics.