期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201803323
关键词
cathode solid electrolyte interphase; conversion-type cathodes; electrolyte composition; ion dissolution; lithium ion batteries
类别
资金
- Army Research Office (ARO) [W911NF-12-1-0259]
- Qatar National Research Fund under its National Priorities Research Program [NPRP7-567-2-216]
- China Scholarship Council
As an alternative to commercial Ni- and Co-based intercalation-type cathode materials, conversion-type metal fluoride (MFx) cathodes are attracting more interest due to their promises to increase cell-level energy density when coupled with lithium (Li) or silicon (Si)-based anodes. Among metal fluorides, iron fluorides (FeF2 and FeF3) are regarded as some of the most promising candidates due to their high capacity, moderately high potential and the very low cost of Fe. In this study, the impacts of electrolyte composition on the performance and stability of nanostructured FeF2 cathodes are systematically investigated. Dramatic impacts of Li salt composition, Li salt concentration, solvent composition, and cycling potential range on the cathode's most critical performance parametersstability, capacity, rate, and voltage hysteresis are discovered. In contrast to previous beliefs, it is observed that even if the Fe2+ cation dissolution could be avoided, the dissolution of F- anions may still negatively affect cathode performance. Formation of the more favorable cathode solid electrolyte interface (CEI) is found to minimize both processes.
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