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Application‐Based Prospects for Dual‐Ion Batteries

Von Wiley-VCH zur Verfügung gestellt

A critical look: Dual-ion batteries (DIBs) promise superior kinetics, cycle life, and materials cost, but their achievable energy densities limit their future applications to low-temperature operation and grid-scale energy storage. To overcome this, solid salt storage in the stack and further development of halogen intercalation/conversion cathodes could raise energy density projections to lithium-ion battery levels and are thus vital future research directions.


Dual-ion batteries (DIBs) exhibit a distinct set of performance advantages and disadvantages due to their unique storage mechanism. However, the current cyclability/energy density tradeoffs of anion storage paired with the intrinsic required electrolyte loadings of conventional DIBs preclude their widespread adoption as an alternative to lithium-ion batteries (LIBs). Despite this, their reduced desolvation penalty and low-cost electrode materials may warrant their employment for low-temperature and/or grid storage applications. To expand beyond these applications, this Perspective reviews the prospects of solid salt storage and halogen intercalation-conversion as viable methods to increase DIB energy densities to a level on-par with LIBs. Fundamental limitations of conventional DIBs are examined, technology spaces are proposed where they can make meaningful impact over LIBs, and potential strategies are outlined to improve cell-level energy densities necessary for the widespread adoption of DIBs.

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