Highly-pure tiplite 3.9V-LiFeSO4F Synthesized by a single-step solid-state process and its high electrochemical performance
SCIE
SCOPUS
- Title
- Highly-pure tiplite 3.9V-LiFeSO4F Synthesized by a single-step solid-state process and its high electrochemical performance
- Authors
- Minkyu Kim; Kang, B.
- Date Issued
- 2017-02
- Publisher
- Elsevier Ltd
- Abstract
- In this study, triplite 3.9V-LiFeSO4F in single step solid-state reaction with various precursors was synthesized by understanding the reaction pathway that it forms. The loss of fluorine during a heat treatment can be a main problem because it can cause the formation of non-fluorine compounds such as Li2Fe(SO4)(2) phase, which are undesirable impurity phases. An additional fluorine source was used to compensate the loss of fluorine and led to the formation of highly-pure triplite LiFeSO4F. Furthermore, additional supplementation with sucrose as a carbon source produced highly-pure LiFeSO4F nano particles, coated with a carbon layer. This resulting material can achieve superior rate capability up to 20C rate (3 min discharge), similar to 73 mAhg(-1) and have excellent capacity retention for 350 cycles at 1C charge/1C discharge rate even though the structure of triplite LiFeSO4F does not have an apparent long Li diffusion pathway due to a disordered Li/Fe distribution. These results demonstrate that triplite LiFeSO4F is a promising cathode material with respect to energy density and scalable synthesis capability. Furthermore, this solid-state reaction with additional fluorine source will open novel ways to further engineer the material properties of LiFeSO4F or other fluorine containing compounds. (C) 2017 Elsevier Ltd. All rights reserved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/37483
- DOI
- 10.1016/J.ELECTACTA.2017.01.073
- ISSN
- 0013-4686
- Article Type
- Article
- Citation
- ELECTROCHIMICA ACTA, vol. 228, page. 160 - 166, 2017-02
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