Unusual Activation of Cation Disordering by Li/Fe Rearrangement in Triplite LiFeSO4F
SCIE
SCOPUS
- Title
- Unusual Activation of Cation Disordering by Li/Fe Rearrangement in Triplite LiFeSO4F
- Authors
- Kim, Minkyu; Kim, Minkyung; Park, Heetaek; Li, Hong; Kang, Byoungwoo
- Date Issued
- 2018-08
- Publisher
- WILEY-V C H VERLAG GMBH
- Abstract
- It is reported that cation disordering in triplite LiFeSO4F can be activated by Li/Fe rearrangement that results from irreversible and nondestructive structural changes during the 1st charge/discharge cycle, especially during the charge. This rearrangement decreases the number of edge-shared FeO4F2 connection environments, compared to the pristine material. With this activation, triplite LiFeSO4F exhibits several unexpected electrochemical features in subsequent cycles; a decrease in open-circuit voltage indicating the change in thermodynamic property, negligible volumetric change, enhanced Li diffusion, and facile phase transformation pathway. As a consequence, the cation-disordered triplite LiFeSO4F achieves superior rate capability up to approximate to 66 mA h g(-1) at 40 C rate (1.5 min discharge) and has excellent capacity retention for 500 cycles at 5 C charge/5 C discharge rate and for 1200 cycles at 2 C charge/2 C discharge rate. Therefore, triplite LiFeSO4F can be one of the most promising electrode materials for Li ion batteries.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/95707
- DOI
- 10.1002/aenm.201800298
- ISSN
- 1614-6832
- Article Type
- Article
- Citation
- ADVANCED ENERGY MATERIALS, vol. 8, no. 22, 2018-08
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- There are no files associated with this item.
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