Zhao, Fangjia;
Li, Jianwei;
Chutia, Arunabhiram;
Liu, Longxiang;
Kang, Liqun;
Lai, Feili;
Dong, Haobo;
... He, Guanjie; + view all
(2024)
Highly stable manganese oxide cathode material enabled by Grotthuss topochemistry for aqueous zinc ion batteries.
Energy & Environmental Science
10.1039/d3ee04161a.
(In press).
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Abstract
The design and synthesis of manganese oxide-based materials with high-rate performance and long cycle life is a major challenge for aqueous zinc-ion batteries (AZIBs). This research reports the presence of a synergistic collaboration between vacancies, lattice water and nickel ions on enhancing the hydrated protons hopping via the Grotthuss mechanism for high-performance zinc ion batteries. The Grotthuss mechanism allows for the efficient transfer of a proton charge without the actual movement of the molecule over long distances, resulting in high ionic conductivity. NiMn3O7·3H2O achieves a capacity of 318 mA h g−1 under 200 mA g−1 and 121 mA h g−1 under 5 A g−1 with a retention of 91% after 4000 cycles. The relationship between the remarkable performance and Grotthuss topochemistry is investigated using techniques including synchrotron X-ray absorption spectroscopy and density functional theory. Protons prefer to bond with O2− ions on the Mn-O layer, and proton transfer is favoured in the presence of vacancies. The continuous hopping of protons within the host material induces periodic, temporary local structural changes in the lattice. This dynamic behaviour alters the energy barriers for ions intercalation and deintercalation. Nickel ions facilitate the ongoing mobility of hydrated protons via Grotthuss hopping by preserving the system's electrical neutrality, which counterbalances the dynamic changes caused by proton migration. This study provides insight into the Grotthuss conduction mechanism for the development of high-performance cathode materials in AZIBs.
| Type: | Article |
|---|---|
| Title: | Highly stable manganese oxide cathode material enabled by Grotthuss topochemistry for aqueous zinc ion batteries |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d3ee04161a |
| Publisher version: | http://dx.doi.org/10.1039/d3ee04161a |
| Language: | English |
| Additional information: | This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. https://creativecommons.org/licenses/by/3.0/ |
| Keywords: | Science & Technology, Physical Sciences, Technology, Life Sciences & Biomedicine, Chemistry, Multidisciplinary, Energy & Fuels, Engineering, Chemical, Environmental Sciences, Chemistry, Engineering, Environmental Sciences & Ecology, CHARGE STORAGE MECHANISM, PROTON TRANSPORT, PERFORMANCE, BIRNESSITE, NANOSHEETS, INSIGHT, WATER |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10186902 |
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