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Intercalation Hosts for Multivalent-Ion Batteries
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DOI：10.1002/sstr.202200290.png)
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摘要
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Among intercalation, alloying, and conversion battery chemistries, the intercalation chemistry is most widely used in commercial applications due to its superior reversibility, round trip efficiency, and stability, albeit at the expense of reduced specific capacity. While intercalation hosts for monovalent ions (e.g., lithium and sodium) are well developed, the jury is still out on the best available intercalation host materials for multivalent ions such as magnesium, zinc, calcium, and aluminum. In multivalent systems, it is challenging to find electrode materials that can act as a durable host, and accommodate large number of ions, while also permitting fast diffusion kinetics. In this perspective, the electrochemical performance of five distinct class of materials (prussian blue analogues, sodium super ionic conductors organic, layered, and open-tunnel oxides) for multivalent ion storage is evaluated. The analysis reveals that open-tunnel oxides show noticeably superior performance in multivalent ion batteries. Herein, the underlying reasons for this are discussed and the case is made for an in-depth machine-learning-driven materials exploration effort directed toward discovery of new open-tunneled oxides that could lead to vastly superior multivalent ion batteries.
Keyword:
batteries
intercalation hosts
multivalent ions
open-tunnel oxides
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