Capacitive contribution to lithium storage capacity in porous MoO3 films

Porous MoO 3 films are obtained by electrodepositing on Ni substrates. The galvanostatic charge/discharge tests show that, the film cathodes have a reversible capacity of 190   mA   h   g −1 at a current density of 30   mA   g −1 between the voltage limits of 1.5–3.5   V vs. Li + /Li, a much better performance than the pristine MoO 3 powder. More than 75% capacitive contribution in the capacity of porous MoO 3 films is responsible for the high capacity, according to the cyclic voltammetry analysis. Another improved property of the porous MoO 3 films is the rate performance, which still retains 70 mA   h   g −1 at a current density of 1.25   A   g −1 . The chronopotentiometry results reveal that, the prominent rate performances are owing to the high rate ability of the capacitive contribution.