Facile Synthesis of Hierarchical Porous Three-Dimensional Free-Standing MnCo2O4Cathodes for Long-Life Li-O2Batteries.
Hierarchical porous three-dimensional MnCo2O4nanowire bundles were obtained by a universal and low-cost hydrothermal method, which subsequently act as a carbon-free and binder-free cathode for Li-O2cell applications. This system showed a high discharge capacity of up to 12 919 mAh g-1at 0.1 mA cm-2and excellent rate capability. Under constrained specific capacities of 500 and 1000 mAh g-1, Li-O2batteries could be successfully operated for over 300 and 144 cycles, respectively. Moreover, their charge voltage was markedly decreased to about 3.5 V. Their excellent electrochemical performance is proposed to be related to the conductivity enhancements resulting from the hierarchical interconnected mesoporous/macroporous weblike structure of the hybrid MnCo2O4cathode, which facilitated the electron and mass transport. More importantly, after 2 months of cycling, the microstructure of the cathode was maintained and a recyclability of over 200 cycles of the reassembled Li-O2cells was achieved. The effects of the level of electrolyte and corrosion of the lithium anode during long-term cycling on the electrochemical property of Li-O2cells have been explored. Furthermore, the nucleation process of the discharge product morphology has been investigated.
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.
Haitao
H
Wu
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.|Collaborative Innovation Center of Electric Vehicles in Beijing , No. 5 Zhongguancun South Avenue, Haidian District, Beijing 100081, People's Republic of China.
Wang
W
Sun
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.
Yan
Y
Wang
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.
Fang
F
Wang
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.
Junfei
J
Liu
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.
Xinyang
X
Yue
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.|Collaborative Innovation Center of Electric Vehicles in Beijing , No. 5 Zhongguancun South Avenue, Haidian District, Beijing 100081, People's Republic of China.
Zhenhua
Z
Wang
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.
Jinshuo
J
Qiao
School of Chemistry and Chemical Engineering, Queen's University , Belfast, Northern Ireland BT9 5AG, U.K.
David W
DW
Rooney
Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.|Collaborative Innovation Center of Electric Vehicles in Beijing , No. 5 Zhongguancun South Avenue, Haidian District, Beijing 100081, People's Republic of China.
Kening
http://orcid.org/0000-0002-8031-1866
K
Sun
MnCo2O4 nanowires; binder-free; carbon-free; free-standing catalysts; lithium-oxygen batteries