Cao, X;
You, Y;
Sha, D;
Xia, H;
Wang, H;
Zhang, J;
Hu, R;
... Sun, ZM; + view all
(2023)
Ultralong Cycle Life for Deep Potassium Storage Enabled by BiOCl/MXene van der Waals Heterostructures.
Advanced Functional Materials
, 33
(34)
, Article 2303275. 10.1002/adfm.202303275.
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Abstract
Conversion/alloying-type anodes are drawing attention due to their high theoretical capacities, but inferior reversibility, especially under low current densities, has hampered potential applications. Conventional strategies mainly focus on conversion/alloying processes, whereas the intercalation process is rarely analyzed. Herein, the intercalation process is correlated with conversion/alloying processes by ion dispersion states. BiOCl/Ti3C2Tx MXene van der Waals heterostructure is selected as a proof-of-concept system. Multifunctional MXenes not only contribute to atomic dispersion and boosted ion diffusion at the first cycle by constructing a novel heterostructure but serve as supporting frameworks to sustain long-term structural stability. Consequently, a cell with BiOCl/MXene anode delivers an ultralong cycle-life of running over ten months, maintaining a high capacity of 225 mAh g−1 over 1300 cycles at 100 mA g−1 and a retention of 81.3%. These findings verify that enhanced initial intercalation can facilitate higher reversibility and shed light on developing high-performance conversion/alloying-type anodes.
| Type: | Article |
|---|---|
| Title: | Ultralong Cycle Life for Deep Potassium Storage Enabled by BiOCl/MXene van der Waals Heterostructures |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/adfm.202303275 |
| Publisher version: | https://doi.org/10.1002/adfm.202303275 |
| 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: | BiOCl, MXenes, heterostructures, optimized intercalation, potassium-ion batteries |
| 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/10170859 |
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