Zhang, Wei;
Wu, Yulun;
Dai, Yuhang;
Xu, Zhenming;
He, Liang;
Li, Zheng;
Li, Shihao;
... Parkin, Ivan P; + view all
(2023)
“Mn-locking” effect by anionic coordination manipulation stabilizing Mn-rich phosphate cathodes.
Chemical Science
, 14
pp. 8662-8671.
10.1039/d3sc03095d.
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Abstract
High-voltage cathodes with high power and stable cyclability are needed for high-performance sodium-ion batteries. However, the low kinetics and inferior capacity retention from structural instability impede the development of Mn-rich phosphate cathodes. Here, we propose light-weight fluorine (F) doping strategy to decrease the energy gap to 0.22 eV from 1.52 eV and trigger a “Mn-locking” effect—to strengthen the adjacent chemical bonding around Mn as confirmed by density functional theory calculations, which ensure the optimized Mn ligand framework, suppressed Mn dissolution, improved structural stability and enhanced electronic conductivity. The combination of in situ and ex situ techniques determine that the F dopant has no influence on the Na+ storage mechanisms. As a result, an outstanding rate performance up to 40C and an improved cycling stability (1000 cycles at 20C) are achieved. This work presents an effective and widely available light-weight anion doping strategy for high-performance polyanionic cathodes.
| Type: | Article |
|---|---|
| Title: | “Mn-locking” effect by anionic coordination manipulation stabilizing Mn-rich phosphate cathodes |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d3sc03095d |
| Publisher version: | https://doi.org/10.1039/D3SC03095D |
| Language: | English |
| Additional information: | © The Authors 2023. Original content in this paper is licensed under the terms of the Creative Commons Attribution 3.0 Unported (https://creativecommons.org/licenses/by/3.0/). |
| 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-pp.ucl.ac.uk/id/eprint/10174949 |
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