New liquid carbon dioxide based strategy for high energy/power density LiFePO4

Title
New liquid carbon dioxide based strategy for high energy/power density LiFePO4
Authors
장원영조은미황지은공기천남경완김재훈
Keywords
uniform carbon coating; liquid carbon dioxide; lithium iron phosphate
Issue Date
2017-06
Publisher
Nano energy
Citation
VOL 36-410
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-CO2 result in an ultrathin carbon layer (1.9 nm) distributed all over the primary nano-sized LFP particles (20– 140 nm 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 (168 mAh g− 1 at 0.1 C, 109 Wh kg− 1 and 3.3 kW kg− 1 at 30 C, respectively) with excellent long-term cyclability (84% cycle retention at 10 C after 1000 cycles). In addition, the ultrathin and uniform carbon layer of the mesoporous microspheres allows a high tap density (1.4 g cm− 3) resulting in a high volumetric energy density (458 Wh L− 1 at a 30 C 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.
URI
http://pubs.kist.re.kr/handle/201004/66627
ISSN
2211-2855
Appears in Collections:
KIST Publication > Article
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