title: Insights into the Li Diffusion Dynamics and Nanostructuring of H2Ti12O25 To Enhance Its Li Storage Performance.
abstract: Dodecatitanate H2Ti12O25 crystal has a condensed layered structure and exhibits noteworthy Li storage performance that makes it an anode material with great potential for use in Li-ion batteries. However, an unknown Li diffusion mechanism and a sluggish level of Li dynamics through elongated diffusion paths inside this crystal has impeded any forward development in resolving its limited rate capability and cyclic stability. In this study, we investigated the Li diffusion dynamics inside the H2Ti12O25 crystal that play an essential role in Li storage performance. A study of density functional theory combined with experimental evaluation confirmed a strong dependence of Li storage performance on its diffusion. In addition, a nanostructured H2Ti12O25 containing a bundle of nanorods is developed via the introduction of a kinetic gap during the structural transformation, which conferred a significantly shortened diffusion time/length for Li in H2Ti12O25. The nanostructured H2Ti12O25 has high specific capacity (∼230 mAh g(-1)) and exhibits enhanced cyclic stability and rate capability compared with conventional bulky H2Ti12O25. The H2Ti12O25 proposed in this study has high potential for use as an anode material with excellent safety and stability.
authors.affiliation: World Class University (WCU) Program of Chemical Convergence for Energy & Environment, School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University , Seoul 151-742, Republic of Korea.
authors.forename: Soomin
authors.initials: S
authors.lastname: Park
authors.affiliation: World Class University (WCU) Program of Chemical Convergence for Energy & Environment, School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University , Seoul 151-742, Republic of Korea.
authors.forename: Young Geun
authors.initials: YG
authors.lastname: Yoo
authors.affiliation: World Class University (WCU) Program of Chemical Convergence for Energy & Environment, School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University , Seoul 151-742, Republic of Korea.
authors.forename: Inho
authors.initials: I
authors.lastname: Nam
authors.affiliation: World Class University (WCU) Program of Chemical Convergence for Energy & Environment, School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University , Seoul 151-742, Republic of Korea.
authors.forename: Seongjun
authors.initials: S
authors.lastname: Bae
authors.affiliation: World Class University (WCU) Program of Chemical Convergence for Energy & Environment, School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University , Seoul 151-742, Republic of Korea.
authors.forename: Jongseok
authors.initials: J
authors.lastname: Park
authors.affiliation: Department of Chemical Engineering, University of Seoul , Seoul 130-743, Republic of Korea.
authors.forename: Jeong Woo
authors.initials: JW
authors.lastname: Han
authors.affiliation: World Class University (WCU) Program of Chemical Convergence for Energy & Environment, School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University , Seoul 151-742, Republic of Korea.
authors.forename: Jongheop
authors.initials: J
authors.lastname: Yi
keywords: H2Ti12O25; Li diffusivity; Li-ion battery; anode; rate capability