NANOSTRUCTURED METAL OXIDES FOR ANODES OF LI-ION RECHARGEABLE BATTERIES Page: 4 of 9
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[Tisubstrate.raw] Ti substrate Au
00-048-1719> Coo - Cobalt Oxide
10 20 30 40 50 60 70 80
Fig.1 XRD of Co304 thin film on Ti substrate
Fig.2(a) Hollow NRs of Co3O4 Ti substrate Fig.2(b) Hollow NRs of Co3O4 on Ti
(x10,000) substrate (x100,000)
The first three discharge- charge cycles of Co3O4 NRs anode are shown in Fig.3. The
Co304 NRs anode demonstrated 2484 mAh/g of discharge capacity from 2.7 V to 0.01 V
and was recharged to 3 V with 1433 mAh/g capacity in the first cycle. The reversible
capacity of Co3O4 NRs was five times higher than the carbon anode (372 mAh/g).
Although it shows some of promises, the capacity gradually decreased in the following
cycles (Fig.4). After 50 cycles, the capacity was reduced to 60 mAh/g (Fig.5). SEM
observation shows that the most hollow nanorods were destructed to the fragments and
lost electric contact with current collectors after 50 cycles (Fig,6). It is clear that to
sustain high capacity, the metal oxides have to maintain their structural integrity during
cyclic conversion and recovery.
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Au, M. NANOSTRUCTURED METAL OXIDES FOR ANODES OF LI-ION RECHARGEABLE BATTERIES, article, December 4, 2009; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc932103/m1/4/: accessed April 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.