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New liquid carbon dioxide based strategy for high energy/power density LiFePO4
- Source :
- Nano Energy; June 2017, Vol. 36 Issue: 1 p398-410, 13p
- Publication Year :
- 2017
-
Abstract
- A liquid carbon dioxide (l-CO2) based coating approach is developed for ultrathin, uniform, and conformal carbon coating of hierarchically mesoporous LiFePO4(LFP) nano/microspheres for fabricating high-energy-density and high-power-density carbon coated LFP (C-LFP) with long-term cyclability. The unique properties of l-CO2result in an ultrathin carbon layer (1.9nm) distributed all over the primary nano-sized LFP particles (20–140nm in diameter), forming a core (LFP)-shell (carbon) structure. This unique structure provides facile penetration of liquid electrolytes and rapid electron and Li-ion transport. C-LFP exhibits high reversible capacity, high energy and power density (168mAhg−1at 0.1C, 109Whkg−1and 3.3kWkg−1at 30C, respectively) with excellent long-term cyclability (84% cycle retention at 10C after 1000 cycles). In addition, the ultrathin and uniform carbon layer of the mesoporous microspheres allows a high tap density (1.4gcm−3) resulting in a high volumetric energy density (458WhL−1at a 30C rate). Furthermore, C-LFP presents a high capacity and stable cycling performance under low-temperature and high-temperature environment. Well-developed carbon coating approach in this study is simple, scalable, and environmentally benign, making it very promising for commercial-scale production of electrode materials for large-scale Li-ion battery applications.
Details
- Language :
- English
- ISSN :
- 22112855
- Volume :
- 36
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Nano Energy
- Publication Type :
- Periodical
- Accession number :
- ejs41816388
- Full Text :
- https://doi.org/10.1016/j.nanoen.2017.04.046