Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V2O5 Aerogel Cathodes.
| Autor: | Wangoh LW, Huang Y, Jezorek RL; Roy & Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104-6323, United States., Kehoe AB; School of Chemistry & CRANN, Trinity College Dublin , Dublin 2, Ireland., Watson GW; School of Chemistry & CRANN, Trinity College Dublin , Dublin 2, Ireland., Omenya F, Quackenbush NF, Chernova NA, Whittingham MS, Piper LF |
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| Jazyk: | angličtina |
| Zdroj: | ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2016 May 11; Vol. 8 (18), pp. 11532-8. Date of Electronic Publication: 2016 Apr 27. |
| DOI: | 10.1021/acsami.6b02759 |
| Abstrakt: | V2O5 aerogels are capable of reversibly intercalating more than 5 Li(+)/V2O5 but 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 V2O5 aerogel 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. |
| Databáze: | MEDLINE |
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