期刊
JOURNAL OF POWER SOURCES
卷 211, 期 -, 页码 108-118出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.03.076
关键词
High voltage spinel cathodes; Magnetron sputtering; Thin films; Layered-spinel composite structure; Coatings
资金
- Laboratory Directed Research and Development Program of Oak Ridge National Laboratory for the U.S. Department of Energy
- ORNL SHaRE
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
Li-rich and stoichiometric Li1Mn1.5Ni0.5O4 (LMNO) cathode films have been successfully prepared by magnetron sputtering. Sputtering from a Li stoichiometric target yields Li-rich films composed of spine!, layered and monoclinic phases. Films obtained from a Li deficient target are mostly made of a spinel phase and little layered material. The resulting cathode thin films have good capacity retention and very high rate capability. The reaction mechanism has been investigated by XRD and HRTEM and evidences the reversible formation of a spinel phase, as is generally found for the powder samples. The film geometry enables us to understand the effect of coatings (ZnO or LiPON). Coating high voltage cathodes reduces the coulombic losses, but at the price of rate performance. Nonetheless, these coated sputtered electrode thin films offer a higher rate capability than other LMNO thin films obtained by other physical vapor deposition techniques. (C) 2012 Elsevier B.V. All rights reserved.
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