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Stable Sodium‐Metal Batteries in Carbonate Electrolytes Achieved by Bifunctional, Sustainable Separators with Tailored Alignment
,
Zhen Xu ,
Qicheng Zhang ,
Xin Song ,
Xuekun Lu ,
Zhenyu Zhang ,
Amaka J. Onyianta ,
Mengnan Wang ,
Maria‐Magdalena Titirici ,
Stephen J. Eichhorn
Advanced Materials, Volume: 34, Issue: 49
Swansea University Author:
Jing Wang
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DOI (Published version): 10.1002/adma.202206367
Abstract
Sodium (Na) is the most appealing alternative to lithium as an anode material for cost-effective, high-energy-density energy-storage systems by virtue of its high theoretical capacity and abundance as a resource. However, the uncontrolled growth of Na dendrites and the limited cell cycle life impede...
| Published in: | Advanced Materials |
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| ISSN: | 0935-9648 1521-4095 |
| Published: |
Wiley
2022
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa66850 |
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| Abstract: |
Sodium (Na) is the most appealing alternative to lithium as an anode material for cost-effective, high-energy-density energy-storage systems by virtue of its high theoretical capacity and abundance as a resource. However, the uncontrolled growth of Na dendrites and the limited cell cycle life impede the large-scale practical implementation of Na-metal batteries (SMBs) in commonly used and low-cost carbonate electrolytes. Herein, the employment of a novel bifunctional electrospun nanofibrous separator comprising well-ordered, uniaxially aligned arrays, and abundant sodiophilic functional groups is presented for SMBs. By tailoring the alignment degree, this unique separator integrates with the merits of serving as highly aligned ion-redistributors to self-orientate/homogenize the flux of Na-ions from a chemical molecule level and physically suppressing Na dendrite puncture at a mechanical structure level. Remarkably, unprecedented long-term cycling performances at high current densities (≥1000 h at 1 and 3 mA cm−2, ≥700 h at 5 mA cm−2) of symmetric cells are achieved in additive-free carbonate electrolytes. Moreover, the corresponding sodium–organic battery demonstrates a high energy density and prolonged cyclability over 1000 cycles. This work opens up a new and facile avenue for the development of stable, low-cost, and safe-credible SMBs, which could be readily extended to other alkali-metal batteries. |
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| Keywords: |
carbonate electrolytes; highly aligned nanofibers; long cycle life; sodium-metal batteries; sustainable separators |
| College: |
Faculty of Science and Engineering |
| Funders: |
Engineering and Physical Sciences Research Council. Grant Number: EP/V002651/1
Edinburgh Napier University
China Scholarship Council |
| Issue: |
49 |