期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 16, 页码 7383-7393出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta00862g
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资金
- Swiss Federal Commission for Technology and Innovation (CTI) through the CTI Swiss Competence Centers for Energy Research (SCCER)
- Swiss Federal Commission for Technology and Innovation (CTI) through the CTI Swiss Competence Centers for Energy Research (CTI) [14698.2 PFIW-IW]
- Swiss Federal Commission for Technology and Innovation (CTI) through the CTI Swiss Competence Centers for Energy Research (Heat and Electricity Storage)
- Competence Center for Energy and Mobility (CCEM, Project SLIB)
- Swiss National Science Foundation (SNF Ambizione project) [ZENP2_154287]
- Belenos Clean Power Holding LTD
With demands placed on batteries constantly increasing, new positive electrode materials with higher energy density, satisfactory power density, and long-term cycling capabilities, composed of highly abundant elements with low-cost, are desired. One such low-cost cathodic material is iron(III) fluoride - FeF3. Its theoretical capacity for single-electron reduction, accompanied by the insertion of Li+ ions, is 237 mA h g(-1). Herein we present a new synthesis for nanocrystalline FeF3 using inexpensive iron trifluoroacetate as a molecular single-source precursor. We also report an adaptation of this simple chemistry to several transition metal difluorides (M = Fe, Co, and Mn). With FeF3, a high capacity of 220 mA h g(-1) was attained at a moderate current density of 100 mA g(-1) (similar to 0.5 C). In addition to high capacity, we see the evidence for high rate-capability. Capacities of up to 155 mA h g(-1) were observed with 1-minute (10 A g(-1)) charge-discharge ramps, and at least 88% of this capacity was retained after 100 cycles. When tested as a sodium cathode, FeF3 exhibits capacities of up to 160 mA h g(-1) at a current rate of 200 mA h g(-1).
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