Heteroepitaxy-Induced Rutile VO2 with Abundantly Exposed (002) Facets for High Lithium Electroactivity

Title
Heteroepitaxy-Induced Rutile VO2 with Abundantly Exposed (002) Facets for High Lithium Electroactivity
Authors
박상백이찬우김재찬송희조심현우이상욱김동완
Issue Date
2016-07
Publisher
ACS energy letters
Citation
VOL 1, NO 1-224
Abstract
Research on VO2 cathodes for lithium ion batteries has been mainly focused on the VO2 (B) phase. However, rutile VO2 (M/R) has rarely been studied because of the intrinsically low lithium activity resulting from the highly anisotropic nature of lithium accommodation. Here, we demonstrate that heteroepitaxial engineering can be an effective strategy for activating the anisotropic electrode and developing kinetically superior electrodes. Appropriate lattice mismatch between the active material (VO2) and conductive support (Sb:SnO2) yields a coherent interface, where tensile strain aids preferential growth along the rutile c-axis as well as expansion in the ab plane and thereby the exposure of reactive (002) facets. The VO2-Sb:SnO2 electrode exhibits high reversible capacity (350 mA h g(-1) at 100 mA g(-1)) and ultrafast rate capability (196 mA h g(-1) at 2000 mA g(-1)) with structural stability, which represents record-high performance compared with previous VO2 reports, including those on other polymorphs such as VO2 (A) and VO2 (B).
URI
http://pubs.kist.re.kr/handle/201004/71246
ISSN
2380-8195
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE