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Your search keyword '"Omenya, Fredrick"' showing total 4 results
Start Over Author "Omenya, Fredrick" Journal acs applied materials & interfaces
4 results on '"Omenya, Fredrick"'

3. Thermal Stability and Reactivity of Cathode Materials for Li-Ion Batteries

Author

Huang, Yiqing, primary, Lin, Yuh-Chieh, additional, Jenkins, David M., additional, Chernova, Natasha A., additional, Chung, Youngmin, additional, Radhakrishnan, Balachandran, additional, Chu, Iek-Heng, additional, Fang, Jin, additional, Wang, Qi, additional, Omenya, Fredrick, additional, Ong, Shyue Ping, additional, and Whittingham, M. Stanley, additional

Published
2016
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4. Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V2O5Aerogel Cathodes

Author

Wangoh, Linda W., Huang, Yiqing, Jezorek, Ryan L., Kehoe, Aoife B., Watson, Graeme W., Omenya, Fredrick, Quackenbush, Nicholas F., Chernova, Natasha A., Whittingham, M. Stanley, and Piper, Louis F. J.

Abstract

V2O5aerogels are capable of reversibly intercalating more than 5 Li+/V2O5but suffer from lifetime issues due to their poor capacity retention upon cycling. We employed a range of material characterization and electrochemical techniques along with atomic pair distribution function, X-ray photoelectron spectroscopy, and density functional theory to determine the origin of the capacity fading in V2O5aerogel cathodes. In addition to the expected vanadium redox due to intercalation, we observed LiOH species that formed upon discharge and were only partially removed after charging, resulting in an accumulation of electrochemically inactive LiOH over each cycle. Our results indicate that the tightly bound water that is necessary for maintaining the aerogel structure is also inherently responsible for the capacity fade.

Published
2016
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