Polygonal multi-polymorphed Li4Ti5O12@rutile TiO2 as anodes in lithium-ion batteries

• Published in: Nano research Vol. 12; no. 4; pp. 897 - 904
• Main Authors: Hwang, Chang Hyun, Kim, Hee-eun, Nam, Inho, Bang, Jin Ho
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01.04.2019; Springer Nature B.V
• Subjects: Anodes; Atomic/Molecular Structure and Spectra; Batteries; Biomedicine; Biotechnology; Chemistry and Materials Science; Condensed Matter Physics; Diffusion barriers; Electrode materials; Interface reactions; Interface stability; Kinetics; Lithium; Lithium-ion batteries; Materials Science; Nanotechnology; Oxides; Polygons; Reaction kinetics; Rechargeable batteries; Research Article; Rutile; Synthesis; Titanium dioxide; Li–Ti oxide multi-polymorphs; @rutile TiO; lithium-ion batteries; Ti; anode; micro-polygon structure; Li; O
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-019-2320-0

Li 4 Ti 5 O 12 (LTO) has attracted considerable attention in lithium-ion battery (LIB) applications because of its favorable characteristics as an anode material. Despite its promise, the widespread use of LTO is still limited primarily due to its intrinsically poor electric and ionic conductivities and high surface reactivity. To address these issues, we designed polygonal nanoarchitectures composed of various Li–Ti oxide crystal polymorphs by a facile synthesis route. Depending on the pH condition, this synthesis approach yields multi-polymorphed Li–Ti oxides where the interior is dominantly composed of a Li-rich phase and the exterior is a Li-deficient (or Li-free) phase. As one of these variations, a polygonal LTO-rutile TiO 2 structure is formed. The rutile TiO 2 on the surface of this LTO composite significantly improves the kinetics of Li + insertion/extraction because the channel along the c -axis in TiO 2 provides a Li + highway due to the significantly low energy barrier for Li + diffusion. Moreover, the presence of rutile TiO 2 , which is less reactive with a carbonate-based electrolyte, ensures long-term stability by suppressing the undesirable interfacial reaction on LTO.