Effects of Fluorine Doping on Electrochemical Performance of Spinel-Layered Li3Mn3O7.5-xFx as Cathode Materials for Li-Ion Batteriesopen access
- Authors
- Im, Jong Chan; Ngoc Hung Vu; Ha Tran Huu; Lee, David S. H.; Im, Won Bin
- Issue Date
- May-2019
- Publisher
- ELECTROCHEMICAL SOC INC
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.166, no.8, pp.A1568 - A1573
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- Volume
- 166
- Number
- 8
- Start Page
- A1568
- End Page
- A1573
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/14172
- DOI
- 10.1149/2.0861908jes
- ISSN
- 0013-4651
- Abstract
- A simple synthesis procedure for solid-state reactions at an intermediate temperature (500 degrees C) is applied to synthesize F-doped spinel-layered 0.5Li(2)MnO(3)center dot 0.5Li(4)Mn(5)O(12) (Li3Mn3O7.5-xFx with x = 0, 0.05, 0.1, and 0.2). The F-doping does not affect the crystal structure or the morphology of the pristine sample. However, F-doping increases the Mn3+ content, leading to an improved electronic conductivity and a lower charge-transfer resistance. In addition, F-doping also reduces the difference of voltage between the oxidation and reduction processes, and enhances the Li+ diffusion coefficient (with a maximum four times higher than that of the pristine sample). Consequently, the capacity and rate capability of the cathode are improved by F-doping (the x = 0.1 sample can provide a high capacity of 300 mAh g(-1) at C/10).
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