Pseudocapacitive lithium storage in TiO.sub.2./sub.(B)

0000604 - ÚFCH JH 2006 RIV US eng J - Journal Article
Zukalová, Markéta - Kalbáč, Martin - Kavan, Ladislav - Exnar, I. - Grätzel, M.
Pseudocapacitive lithium storage in TiO₂(B).
[Pseudokapacitní akumulace lithia v TiO₂(B).]
Chemistry of Materials. Roč. 17, č. 5 (2005), s. 1248-1255. ISSN 0897-4756. E-ISSN 1520-5002
R&D Projects: GA ČR(CZ) GA203/03/0824; GA ČR(CZ) GD203/03/H140; GA MŠMT 1M0577; GA MŠMT 1P04OCD14.10
Grant - others:EC-COST Action(CZ) D14/0002/99
Institutional research plan: CEZ:AV0Z40400503
Keywords : protonic layered tetratitanate * anatase TiO2 * nanocrystalline anotase * transformation
Subject RIV: CG - Electrochemistry
Impact factor: 4.818, year: 2005

Phase-pure TiO₂(B) with microfibrous morphology was prepared via a newly developed method from amorphous TiO₂. Cyclic voltammetry evidences that Li-insertion into TiO₂(B) is governed by a pseudocapacitive faradaic process, whose rate is not limited by solid-state diffusion of Li⁺ in a broad interval of scan rates. This unusual behavior was discussed in terms of the crystal structure of the TiO2(B) host, having freely accessible parallel channels for Li⁺-transport perpendicular to the (010) face. The characteristic Li-insertion electrochemistry of TiO₂(B) allows re-interpretation of several previous reports, which did not consider explicitly this relation or the presence of TiO₂(B) in various TiO₂ materials of different origin.

Byl vyvinut nový syntézní postup pro přípravu fázově čistého TiO₂(B) s vláknitou morfologií. Cyklická voltametrie ukázala, že inserce lithia do uvedeného materiálu probíhá jako pseudokapacitní faradaický process, jehož rychlost není limitována difúzí Li dovnitř tuhé fáze pro široký interval rychlostí skenu.
Permanent Link: http://hdl.handle.net/11104/0017824