2015
DOI: 10.1039/c5ta02442k
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Abstract: Lithium-oxygen (Li-O 2 ) batteries are considered to be the next generation energy storage technology due to their extremely high theoretical energy density and the simplicity of the battery cells. However, a large energy density can be obtained only with a slow discharge-charge rate, and quickly decreases upon cycling. These drawbacks can be attributed to the large overpotential and sluggish kinetics of the oxygen reduction and evolution reactions. To overcome the current problems, recent research has focused… Show more

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Cited by 32 publications
(30 citation statements)
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“…[56] After full discharge at 500 mA g À1 ,t he surfaces of the three cathodes are coveredb yadisc-like solid product (Figure 5d-f), which is consistent with the Li 2 O 2 morphology reported previously. [11,20,21,23,32,40,47,57,58] In detail, the solid products arem ade up of split layers with rough boundaries, but the size of every particlei sd ifferentf or the three cathodes.F or the SP cathode,t he average size of the Li 2 O 2 particles is the largestw ith ad iametero fa pproximately 800-900 nm, whereas for the FNT/SP cathode,t he diameter of the Li 2 O 2 particles is approximately 400-500 nm. Thes maller discharge product arises mainly from the uniform distribution of oxygen and electrolyte with the help of the FNTs in the cathode,a nd thus there are abundant active sites for the discharge product deposition at the same time.T he morphologies of the three cathodes after charging are presented in Figure 5g-i.…”
Section: Resultsmentioning
confidence: 99%
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“…[56] After full discharge at 500 mA g À1 ,t he surfaces of the three cathodes are coveredb yadisc-like solid product (Figure 5d-f), which is consistent with the Li 2 O 2 morphology reported previously. [11,20,21,23,32,40,47,57,58] In detail, the solid products arem ade up of split layers with rough boundaries, but the size of every particlei sd ifferentf or the three cathodes.F or the SP cathode,t he average size of the Li 2 O 2 particles is the largestw ith ad iametero fa pproximately 800-900 nm, whereas for the FNT/SP cathode,t he diameter of the Li 2 O 2 particles is approximately 400-500 nm. Thes maller discharge product arises mainly from the uniform distribution of oxygen and electrolyte with the help of the FNTs in the cathode,a nd thus there are abundant active sites for the discharge product deposition at the same time.T he morphologies of the three cathodes after charging are presented in Figure 5g-i.…”
Section: Resultsmentioning
confidence: 99%
“….Ah igh-capacity nonaqueousL i-O 2 battery with enhanced oxygenr eductiona nd evolution utilizing ac atalyst prepared by the in situ decoration of hematite nanoparticles on CNTs was presented by Jeee tal. [47] Their battery delivered av ery high capacity of 26.5 Ah g À1 in the first cycle andarelatively good cycling performance (48 cyclesw ith ac apacity limit of 1.5 Ah g À1 ). Wu et al [23] synthesized Fe 2 O 3 nanoparticles supported on Vulcan XC-72 carbon as acatalyst for the OER and obtained an onaqueous Li-O 2 battery with an excellent cycling stability ( % 50 cycles with ac apacity of 500 mAh g À1 ).…”
mentioning
confidence: 98%
“…4b). [5,35,36] The peak shift of the surface Fe 3+ in Fe-A/P-CNT toward a lower binding energy also indicate the stronger coordination of iron with pyridinic nitrogen. [6,35,36] RDE tests of Fe-A/P-CNT at different rotational speeds were performed (Fig.…”
Section: Electrochemical Analysismentioning
confidence: 99%
“…5b). The Koutecky-Levich plots [5,37] were obtained by using −1 = −1 + −1 −1/2 and = 0.62 2/3 −1/6 , where −1 is kinetic limiting current density, ω is the rotational speed, n is the number of electrons transferred, F is the Faraday constant (F = 96,500 C mol -1 ), C is the bulk concentration of O2 (C = 1.2×10 -6 mol cm -3 in 0.1 M KOH), D…”
Section: Electrochemical Analysismentioning
confidence: 99%
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