A monoclinic polymorph of sodium birnessite for ultrafast and ultrastable sodium ion storage

Sodium transition metal oxides with layered structures are attractive cathode materials for sodium-ion batteries due to their large theoretical specific capacities. However, these layered oxides suffer from poor cyclability and low rate performance because of structural instability and sluggish electrode kinetics. In the present work, we show the sodiation reaction of Mn₃O₄ to yield crystal water free NaMnO_2-y-δ(OH)_2y, a monoclinic polymorph of sodium birnessite bearing Na/Mn(OH)₈ hexahedra and Na/MnO₆ octahedra. With the new polymorph, NaMnO_2-y-δ(OH)_2y exhibits an enlarged interlayer distance of about 7 Å, which is in favor of fast sodium ion migration and good structural stability. In combination of the favorable nanosheet morphology, NaMn_2-y-δ(OH)_2y cathode delivers large specific capacity up to 211.9 mAh g^-1, excellent cycle performance (94.6% capacity retention after 1000 cycles), and outstanding rate capability (156.0 mAh g^-1 at 50 C). This study demonstrates an effective approach in tailoring the structural and electrochemical properties of birnessite towards superior cathode performance in sodium-ion batteries.