Improved pseudocapacitive charge storage in highly ordered mesoporous TiO2/carbon nanocomposites as high-performance Li-ion hybrid supercapacitor anodes |
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| Authors: | Yujin Lee Seoa Kim Jeong Han Lee Kwang Chul Roh Eunho Lim Jinwoo Lee |
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| Affiliation: | Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science Technology (KAIST), Daejeon 34141 Republic of Korea.; Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology (KICET), Jinju Gyeongnam 52851 Republic of Korea ; Carbon Resources Institute, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114 Republic of Korea, |
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| Abstract: | A Li-ion hybrid supercapacitor (Li-HSCs), an integrated system of a Li-ion battery and a supercapacitor, is an important energy-storage device because of its outstanding energy and power as well as long-term cycle life. In this work, we propose an attractive material (a mesoporous anatase titanium dioxide/carbon hybrid material, m-TiO2-C) as a rapid and stable Li+ storage anode material for Li-HSCs. m-TiO2-C exhibits high specific capacity (∼198 mA h g−1 at 0.05 A g−1) and promising rate performance (∼90 mA h g−1 at 5 A g−1) with stable cyclability, resulting from the well-designed porous structure with nanocrystalline anatase TiO2 and conductive carbon. Thereby, it is demonstrated that a Li-HSC system using a m-TiO2-C anode provides high energy and power (∼63 W h kg−1, and ∼4044 W kg−1).A mesoporous TiO2/carbon nanocomposite prepared by block copolymer self-assembly improves pseudocapacitive behavior and achieves high energy/power density Li-ion hybrid supercapacitors. |
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