2D a-MoO3 was synthesized using a facile, inexpensive and scalable liquid-phase exfoliation method. 2D a-MoO3/SWCNT (85 wt%/15 wt%) composite films were manufactured by vacuum filtration and their energy storage properties were investigated in a LiClO4/propylene carbonate electrolyte in a 1.5 V to 3.5 V vs. Li+/Li electrochemical window. Cyclic voltammetry showed typical ion intercalation peaks of a-MoO3 and a capacitance of 200 F/g was achieved at 10 mV/s and 82 F/g at 50 mV/s. The composite electrodes achieved a capacitive charge storage of 375 C/g and a diffusion-controlled maximum charge storage of 703 C/g. The latter being superior to the charge storage achieved by previously reported mesoporous a-MoO3, produced using more cumbersome multi-step templating methods, and a-MoO3 nanobelts . This superior Li-ion intercalation charge storage was attributed to the shorter ion-transport paths of 2D a-MoO3 as compared to other nanostructures. Galvanostatic charge-discharge experiments showed a maximum charge storage of 123.0 mAh/g at a current density of 100 mA/g.