High-areal-capacity Na-ion battery electrode with uncompromised energy and power densities by simultaneous electrospinning-spraying fabrication
Sodium-ion batteries (SIBs) are cost-effective alternatives to lithium-ion batteries (LIBs), but their low energy density remains a challenge. Current electrode designs fail to simultaneously achieve high areal loading, high active content, and superior performance. In response, this work introduces...
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Zusammenfassung: | Sodium-ion batteries (SIBs) are cost-effective alternatives to lithium-ion
batteries (LIBs), but their low energy density remains a challenge. Current
electrode designs fail to simultaneously achieve high areal loading, high
active content, and superior performance. In response, this work introduces an
ideal electrode structure, featuring a continuous conductive network with
active particles securely trapped in the absence of binder, fabricated using a
universal technique that combines electrospinning and electrospraying (co-ESP).
We found that the particle size must be larger than the network's pores for
optimised performance, an aspect overlooked in previous research. The
free-standing co-ESP Na2V3(PO4)3 (NVP) cathodes demonstrated state-of-the-art
296 mg cm-2 areal loading with 97.5 wt.% active content, as well as remarkable
rate-performance and cycling stability. Co-ESP full cells showed uncompromised
energy and power densities (231.6 Wh kg-1 and 7152.6 W kg-1), leading among
reported SIBs with industry-relevant areal loadings. The structural merit is
analysed using multi-scale X-ray computed tomography, providing valuable design
insights.Finally, the superior performance is validated in the pouch cells,
highlighting the electrode's scalability and potential for commercial
application. |
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DOI: | 10.48550/arxiv.2408.11655 |