期刊
JOURNAL OF POWER SOURCES
卷 338, 期 -, 页码 145-154出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.10.076
关键词
High voltage cathode spinel; Li-ion; Window-shifted systems; High-temperature cycling stability; Lithium titanate; Titanium disulfide
资金
- Department of Energy [DE-SC0001088]
- U.S. Department of Energy (DOE) [DE-SC0001088] Funding Source: U.S. Department of Energy (DOE)
Although the LiMn1.5Ni0.5O4 spinel operating at 4.7 V presents some beneficial characteristics over more traditional positive electrode materials, instability issues at elevated temperature have limited its practical use so far. While we previously proposed Li1+yMn1.6Ni0.5O4-xFx (LMNOF) spinel that is intrinsically stable at elevated temperatures in Li-excess half-cell configuration, we investigate herein fixed, non-excess Li-content window-shifted Li-ion systems. By utilizing Li4Ti5O12 (LTO) or TiS2 negative electrodes stable in broad electrolyte compositions instead of carbonaceous electrodes, we aim at limiting the Li-consuming side reactions such as the formation of solid-electrolyte interphase and enable a focus on the exploration of electrolyte compositions including additives. Utilizing such an approach, excellent fundamental stability of LMNOF in a fixed Li-content Li-ion environment is demonstrated at 55 degrees C with the use of relatively common electrolyte components. (C) 2016 Elsevier B.V. All rights reserved.
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