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Zheng, Yunshan, Li, Junfeng, Ji, Shunping, Hui, Kwan San 
ORCID: https://orcid.org/0000-0001-7089-7587, Wang, Shuo, Xu, Huifang, Wang, Kaixi, Dinh, Duc Anh, Zha, Chenyang, Shao, Zongping and Hui, Kwun Nam
(2023)
Zinc-doping strategy on P2-type Mn-based layered oxide cathode for high-performance potassium-ion batteries.
Small, 19 (39).
ISSN 1613-6810
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Abstract
Mn-based layered oxide is extensively investigated as a promising cathode material for potassium-ion batteries due to its high theoretical capacity and natural abundance of manganese. However, the Jahn–Teller distortion caused by high-spin Mn3+(t2g3eg1) destabilizes the host structure and reduces the cycling stability. Here, K0.02Na0.55Mn0.70Ni0.25Zn0.05O2 (denoted as KNMNO-Z) is reported to inhibit the Jahn–Teller effect and reduce the irreversible phase transition. Through the implementation of a Zn-doping strategy, higher Mn valence is achieved in the KNMNO-Z electrode, resulting in a reduction of Mn3+ amount and subsequently leading to an improvement in cyclic stability. Specifically, after 1000 cycles, a high retention rate of 97% is observed. Density functional theory calculations reveals that low-valence Zn2+ ions substituting the transition metal position of Mn regulated the electronic structure around the Mn-O bonding, thereby alleviating the anisotropic coupling between oxidized O2− and Mn4+ and improving the structural stability. K0.02Na0.55Mn0.70Ni0.25Zn0.05O2 provided an initial discharge capacity of 57 mAh g−1 at 100 mA g−1 and a decay rate of only 0.003% per cycle, indicating that the Zn-doped strategy is effective for developing high-performance Mn-based layered oxide cathode materials in PIBs.
| Item Type: | Article |
|---|---|
| Additional Information: | Funding Information: Y.Z. and J.L. contributed equally to this work. This work was funded by The Science and Technology Development Fund, Macau SAR (File no. 046/2019/AFJ, 0007/2021/AGJ, 006/2022/ALC), the Multi‐Year Research Grants (MYRG2020‐00187‐IAPME and MYRG2022‐00223‐IAPME) from the Research Services and Knowledge Transfer Office at the University of Macau, and the UEA funding, the Science and Technology Program of Guangdong Province of China (Grant No. 2022A0505030028), the Science and Technology Innovation Committee of Shenzhen Municipality (SGDX20201103093600003). The DFT calculations are performed at High Performance Computing Cluster (HPCC) of Information and Communication Technology Office (ICTO) at University of Macau. |
| Uncontrolled Keywords: | jahn–teller distortion,knamnnizno cathodes,mn-based layered oxide,zn-doping strategy,biotechnology,chemistry(all),biomaterials,materials science(all),engineering (miscellaneous) ,/dk/atira/pure/subjectarea/asjc/1300/1305 |
| Faculty \ School: | Faculty of Science > School of Engineering (former - to 2024) |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 04 Apr 2024 11:31 |
| Last Modified: | 14 Dec 2024 01:38 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/94813 |
| DOI: | 10.1002/smll.202302160 |
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