A universal synthetic route to carbon nanotube/transition metal oxide nano-composites for lithium ion batteries and electrochemical capacitors.
Nature Publishing Group
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Zhou, H., Zhang, L., Zhang, D., Chen, S., Coxon, P., He, X., Coto, M., et al. (2016). A universal synthetic route to carbon nanotube/transition metal oxide nano-composites for lithium ion batteries and electrochemical capacitors.. Scientific Reports, 6 37752-37752. https://doi.org/10.1038/srep37752
We report a simple synthetic approach to coaxially grow transition metal oxide (TMO) nanostructures on carbon nanotubes (CNT) with ready control of phase and morphology. A thin (~4 nm) sulfonated-polystyrene (SPS) pre-coating is essential for the deposition of transition metal based materials. This layer has abundant sulfonic groups (-SO3(-)) that can effectively attract Ni(2+), Co(2+), Zn(2+) ions through electrostatic interaction and induce them via hydrolysis, dehydration and recrystallization to form coaxial (NiO, Co3O4, NiCoO2 and ZnCo2O4) shells and a nanosheet-like morphology around CNT. These structures possess a large active surface and enhanced structural robustness when used as electrode materials for lithium-ion batteries (LIBs) and electrochemical capacitors (ECs). As electrodes for LIBs, the ZnCo2O4@CNT material shows extremely stable cycling performance with a discharge capacity of 1068 mAh g(-1) after 100 cycles at a current density of 400 mAg(-1). For EC applications, the NiCoO2@CNT exhibits a high capacitance of 1360 Fg(-1) at current densities of 10 Ag(-1) after 3000 cycles and an overall capacitance loss of only 1.4%. These results demonstrate the potential of such hybrid materials meeting the crucial requirements of cycling stability and high rate capability for energy conversion and storage devices.
External DOI: https://doi.org/10.1038/srep37752
This record's URL: https://www.repository.cam.ac.uk/handle/1810/266483
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/