Excellent Rate Capability of MgO-Templated Mesoporous Carbon as an Na-Ion Energy Storage Material

Abstract

MgO-templated mesoporous carbon was investigated as an anode material for Na-ion storage. The mesoporous carbons exhibited a discharge capacity of 180 mAh g−1 at a current density of 0.1 A g−1 in a potential range of 2.00–0.01 V vs. Na+/Na. This capacity was comparable to that of commercial hard carbon materials. They also showed an outstanding rate capability: 70 mAh g−1 at 4 A g−1, which was 10-fold greater than the corresponding capability of commercial hard carbons. These results indicate that MgO-templated mesoporous carbon is a potential new anode material for high-power-density Na-ion batteries and capacitors.