Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 253, Issue -, Pages 10-17Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2017.06.033
Keywords
Cathode materials; Iron fluoride; Porous structure; Heat treatment; Electrochemical performance
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Funding
- National Nature Science Foundation of China [51204209, 51274240]
- Central South University
- Fundamental Research Funds for the Central Universities of Central South University [2017zzts122]
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Iron fluorides are drawing the attention of researchers for their high specific capacity as cathode materials of lithium ion batteries. In this work, we focus on the structural adjustment of iron fluorides themselves to improve the electrochemical performances. A kind of porous FeF3 with a fusiform structure has been synthesized by a facile solvothermal method and subsequent heat treatment. The synthetic process of hydrated FeF3 was performed by using simple and economic raw materials (iron salt and HF in absolute ethyl alcohol). The crystal water was removed through a mild drying in air, and porosity is given through the slow dehydration process. Electrochemical performance shows that the as-synthesized porous FeF3 can deliver stable reversible capacities of 137.3 mA g(-1) for 100 cycles at 20 mA g(-1). Although the specific capacity is moderate among the current research results of iron fluorides, this open porous structure obviously enhance the cycling stability of iron fluorides, and it can be expected to be improved remarkably with further processing. (C) 2017 Elsevier Inc. All rights reserved.
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