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Co₃O₄ hollow nanospheres doped with ZnCo₂O₄ via thermal vapor mechanism for fast lithium storage

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. Green open access

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Shearing_Co₃O₄ hollow nanospheres doped with ZnCo₂O₄ via thermal vapor mechanism for fast lithium storage_AAM.pdf - Accepted Version

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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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