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Ant-cave-structured nanopore-embedded CoMn2O4 microspheres with stable electrochemical reaction for Li+-air battery
SCI Impact Factor
4.316
Authors
Y. J. Yun, J.-K. Kim, S. Unithrattil, S. K. Choi, H. Park, D. W. Kim, S. S. Lee, H.-K. Jung, Y. Kang, W. B. Im*, and S. Choi
Journal
J. Electrochem. Soc.
Status
published
Vol
167
Page
080537
Year
2020

Herein, nanopore-embedded CoMn2O4 microspheres were successfully synthesized, and their electrochemical behavior as an anode for lithium-ion batteries (LIBs) and as a catalyst for oxygen-reduction/evolution reactions of lithium-air batteries (LABs) cathodes was investigated. The electrodes composed of specifically designed particles exhibited enhanced capacity retention with stable charge-transfer impedance change during the overall lithium conversion reactions as compared to the electrodes composed of conventional particulate nanoparticles. The LAB cathodes with the as-prepared porous compounds exhibit better reversibility with a ∼10% higher oxygen-evolution reactions efficiency and stable capacity retention than those of the Ketjen black-only electrodes. We believe that these novel performance is achieved due to the rational design of the pore-embedded/interconnected CoMn2O4 nanoparticles, which mitigate the detrimental volume change during the repetitive Li+ $\rightleftarrows $ LiOx reaction and facilitate effective lithium ion (for LIBs) and oxygen diffusion (for LABs) in the porous electrode. 

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