In Situ Analysis of the Li-O-2 Battery with Thermally Reduced Graphene Oxide Cathode: Influence of Water Addition
2016 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 120, no 38, 21211-21217 p.Article in journal (Refereed) Published
The Li-O-2 battery technology holds the promise to deliver a battery with significantly increased specific energy compared to today's Li-ion batteries. As a cathode support material, reduced graphene oxide has received increasing attention in the Li-O-2 battery community due to the possibility of increased discharge capacity, increased battery cyclability, and decreased, charging, overpotential. In this. article we investigate the effect of water on a thermally, redircedigraphene, oxide cathode in a Li-O-2 battery. Differential electrochemical mass spectrciscnieveals a, decreased electron count for batteries with 1000 ppm water added- to the electrolyte in comparison to dry batteries, indicating additional parasitic electrochemical or chemical processes. A comparable capacity of the wet and dry batteries indicates that the reaction mechanism in the Li-O-2 battery also depends on the 'surface-of-the cathode and not only on addition of water to the electrolyte as demonstrated by the solution-based mechanism In situ synchrotron X-ray diffraction experiment using a new design of a capillary-based Li-O-2 cell with a thermally reduced graphene oxide cathode shows formation of LiOH along with Li2O2.
Place, publisher, year, edition, pages
2016. Vol. 120, no 38, 21211-21217 p.
IdentifiersURN: urn:nbn:se:uu:diva-307283DOI: 10.1021/acs.jpcc.6b06018ISI: 000384626800008OAI: oai:DiVA.org:uu-307283DiVA: diva2:1046117
FunderDanish National Research Foundation