TY - JOUR
T1 - New liquid carbon dioxide based strategy for high energy/power density LiFePO4
AU - Hwang, Jieun
AU - Kong, Ki Chun
AU - Chang, Wonyoung
AU - Jo, Eunmi
AU - Nam, Kyungwan
AU - Kim, Jaehoon
N1 - Publisher Copyright:
© 2017
PY - 2017/6/1
Y1 - 2017/6/1
N2 - 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.
AB - 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.
KW - Hierarchical structure lithium ion batteries
KW - Liquid carbon dioxide
KW - Lithium iron phosphate
KW - Uniform carbon coating
UR - http://www.scopus.com/inward/record.url?scp=85019001254&partnerID=8YFLogxK
U2 - 10.1016/j.nanoen.2017.04.046
DO - 10.1016/j.nanoen.2017.04.046
M3 - Article
AN - SCOPUS:85019001254
SN - 2211-2855
VL - 36
SP - 398
EP - 410
JO - Nano Energy
JF - Nano Energy
ER -