Journal
JOURNAL OF POWER SOURCES
Volume 307, Issue -, Pages 599-603Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.12.133
Keywords
Lithium battery; Positive electrode; Surface coating; Epitaxial film; Layered rock-salt structure
Funding
- Research and Development Initiative for Scientific Innovation of New Generation Battery (RISING) project of the New Energy and Industrial Technology Development Organization (NEDO
- Japan)
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An epitaxial-film model electrode of LiCoO2(104) was fabricated on SrRuO3(100)/Nb:SrTiO3(100) using pulsed laser deposition. The 50 nm thick LiCoO2(104) film exhibited lithium (de-)intercalation activity with a first discharge capacity of 119 mAh g(-1) between 3.0 and 4.4 V, followed by a gradual capacity fading with subsequent charge-discharge cycles. In contrast, a 3.2 nm thick Li3PO4-coated film exhibited a higher intercalation capacity of 148 mAh g(-1) with superior cycle retention than the uncoated film. In situ surface X-ray diffraction measurements revealed a small lattice change at the coated surface during the (de-)intercalation processes compared to the uncoated surface. The surface modification of LiCoO2 by the Li3PO4 coating could lead to improvement of the structural stability at the surface region during lithium (de-)intercalation at high voltage. (C) 2016 Elsevier B.V. All rights reserved.
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