Journal
NANO LETTERS
Volume 13, Issue 10, Pages 4679-4684Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl4020952
Keywords
Li-O-2 battery; Li2O2; RuO2; carbon nanotube; oxygen evolution reaction; ether-based electrolyte
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Funding
- RIKEN
- JST ALCA program
- MEXT
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Low electriCial efficiency for the lithium-oxygen (Li-O-2) electrochemical reaction is one of the most significant challenges in current nonaqueous Li-O-2 batteries. Here we present ruthenium oxide nanoparticles (RuO2 NPs)' dispersed on multiwalled carbon nanotubes (CNTs) as a cathode, which dramatically increase the electrical efficiency up to 73%. We demonstrate that the RuO2 NPs contribute to the formation of poorly crystalline lithium peroxide (Li2O2) that is coated over the.CNT with large contact area during oxygen reduction reaction (ORR). This unique Li2O2 stiucture can be smoothly decomposed at low potential upon oxygen evolution reaction (OER) by avoiding the energy loss associated with.the decomposition of the more typical Li2O2 structure with a large size, small CNT contact area, and insulating crystals.
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