Synthesis of Mg-Todorokite and Its Electrochemical Behavior in Aqueous Electrolytes

A novel synthesis of the large tunnel structure Mg-containing Todorokite from nano6-MnO_2 and 3mol/L MgCl_2 in a higher pressure caldron was described. XRD and TEM results confirm that Mg-Todorokite is also a nano-phase MnO_2 with homogeneous particle size. Electrochemical studies on constant current discharge and cyclic behavior of Mg-Todorokite in 9mol/L KOH or in 5mol/L LiNO_3 aqueous electrolytes show that it possesses a lower open circuit voltage, and a good cycling performance.