TiO2-reduced graphene oxide nanocomposites by microwave-assisted forced hydrolysis as excellent insertion anode for Li-ion battery and capacitor

• Published in: Journal of power sources Vol. 327; pp. 171 - 177
• Main Authors: Kim, Hyun-Kyung, Mhamane, Dattakumar, Kim, Myeong-Seong, Roh, Ha-Kyung, Aravindan, Vanchiappan, Madhavi, Srinivasan, Roh, Kwang Chul, Kim, Kwang-Bum
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.09.2016
• Subjects: Energy efficiency; Lithium-ion battery; Lithium-ion capacitor; Microwave-assisted forced hydrolysis; Titanium dioxide; Lithium-ion capacitor; Lithium-ion battery; Microwave-assisted forced hydrolysis; Energy efficiency; Titanium dioxide
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2016.07.053

TiO2-reduced graphene oxide (rGO) nanocomposite (TiO2-rGO) is fabricated by microwave-assisted forced hydrolysis and examined as prospective electrode for energy storage applications, especially in Li-ion battery (LIB) and Li-ion capacitor (LIC). First, the uniformly distributed nanoscopic TiO2 particulates (∼3 nm) over rGO nanosheets is evaluated as anode in half-cell assembly to ascertain the Li-insertion behavior and found that ∼0.68 mol Li (∼227 mAh g−1) is reversible. Then, “rocking-chair” type LIB is fabricated with spinel LiMn2O4 cathode, and the LiMn2O4/TiO2-rGO assembly exhibits high capacity (∼120 mAh g−1 at 0.1 C rate), good rate capability (∼53 mAh g−1 at 1 C rate), and excellent cycleability (∼90% initial reversible capacity after 1000 cycle) as well. Similarly, the LIC is also constructed with activated carbon cathode, and such configuration delivered a maximum energy density of ∼50 Wh kg−1 with ∼82% retention after 4000 cycles. The synergistic effect of both rGO and anatase nanoparticles provides excellent energy efficiency and battery performance in different kind of Li-ion based energy storage devices. [Display omitted] •TiO2-rGO nanocomposites are prepared by microwave assisted forced hydrolysis.•Anodic Li-insertion properties of TiO2-rGO are evaluated in half-cell assembly.•Li-ion battery is fabricated with LiMn2O4 cathode with exceptional cycleability.•Activated carbon is used as cathode during the fabrication of Li-ion capacitor.