Song, W;
Ji, K;
Aguadero, A;
Shearing, PR;
Brett, DJL;
Xie, F;
Riley, DJ;
(2018)
Co₃O₄ hollow nanospheres doped with ZnCo₂O₄ via thermal vapor mechanism for fast lithium storage.
Energy Storage Materials
, 14
pp. 324-334.
10.1016/j.ensm.2018.05.004.
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Shearing_Co₃O₄ hollow nanospheres doped with ZnCo₂O₄ via thermal vapor mechanism for fast lithium storage_AAM.pdf - Accepted Version Download (1MB) | Preview |
Abstract
Binary metal oxides offer improved anode materials in lithium ion batteries owing to enhanced electrical conductivity but suffer from large volume expansion on lithiation. A novel route to hollow Co₃O₄ nanospheres doped with ZnCo₂O₄ is demonstrated that mitigates the expansion issue and shows excellent performance at high current densities. The synthetic route is based on the pyrolysis of binary metal-organic-frameworks (MOFs) with the controlled loss of zinc tuning the micro and nanostructure of the material through a thermal vapor mechanism. The optimal structures, that contain hollow Co₃O₄ spheres of ca. 50 nm diameter doped with ZnCo₂O₄, show a specific capacity of 890 mAh g⁻¹ at a current rate of 0.1 A g⁻¹ and show a similar specific capacity at 1 A g⁻¹ after 120 cycles at high current densities. The kinetics of lithiation/delithiation changes from diffusion-controlled to a surface-controlled process by the nanosizing of the particles. The resultant faster ion diffusion and capacitive storage for lithium ions are responsible for the extraordinary high-rate performance of the hollow structures.
| Type: | Article |
|---|---|
| Title: | Co₃O₄ hollow nanospheres doped with ZnCo₂O₄ via thermal vapor mechanism for fast lithium storage |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.ensm.2018.05.004 |
| Publisher version: | https://doi.org/10.1016/j.ensm.2018.05.004 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Binary metal oxide doping, metal organic frameworks, Thermal vapor transport mechanism, Lithium storage |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10058494 |
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