MgO‐Template Synthesis of Extremely High Capacity Hard Carbon for Na‐Ion Battery

Extremely high capacity hard carbon for Na-ion battery, delivering 478 mAh g−1, is successfully synthesized by heating a freeze-dried mixture of magnesium gluconate and glucose MgO-template technique. Influences synthetic conditions nano-structures on electrochemical Na storage properties in the are systematically studied to maximize reversible capacity. Nano-sized MgO particles formed matrix prepared pre-treatment at 600 °C. Through acid leaching carbonization 1500 °C, resultant demonstrates an extraordinarily large g−1 with Coulombic efficiency 88 % first cycle.