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Spherical Li 4 Ti 5 O 12 and Li 4 Ti 5 O 12 carbon nanotube (CNT) composites were synthesized using a colloid system. The electrochemical properties of the composites were thoroughly examined to determine their applicability as hybrid capacitor anodes. The electrical conductivity of the spherical Li 4 Ti 5 O 12 -CNT composite was improved over that of the spherical Li 4 Ti 5 O 12 composite. The synthesized composites were utilized as the anode of a hybrid capacitor, which was assembled with an activated carbon (AC) positive electrode. The CNTs attached on the spherical Li 4 Ti 5 O 12 particles contributed to a 51% reduction of the equivalent series of resistance of the Li 4 Ti 5 O 12 -CNTs/AC hybrid capacitor compared to the Li 4 Ti 5 O 12 / AC hybrid capacitor. Moreover, the Li 4 Ti 5 O 12 -CNTs/AC hybrid capacitor showed a larger capacitance than the Li 4 Ti 5 O 12 / AC hybrid capacitor; specifically, the Li 4 Ti 5 O 12 -CNT/AC hybrid capacitor showed 1.6 times greater capacitance at 40 cycles with a 10 mA cm -2 loading current density.

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