Simplifying electrode design for lithium-ion rechargeable cells

Zheng, Tianye; Kramer, Dominik; Mönig, Reiner; Boles, Steven T.

doi:10.26434/chemrxiv-2022-nxb0c

Cited by 1 publication

(1 citation statement)

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“…Naturally, a prelithiated surface must be sufficiently stable (at least in a dry room), such that the fabrication process can be significantly simplified. 44 This would allow for not only the slurry-based mixing and baking processes to be abandoned, but a better understanding of prelithiated Al reactivity would allow for higher tolerance of the oxygen-and/or moisture-controlled conditions. For instance, reducing the grain size in Al foils via a shot-peening treatment before prelithiation is reported to be helpful to make a LiAl electrode stable in ambient air for several hours.…”

Section: ■ Introductionmentioning

confidence: 99%

Utilization of Li-Rich Phases in Aluminum Anodes for Improved Cycling Performance through Strategic Thermal Control

Zheng

Zhang

Jin

et al. 2023

ACS Appl. Energy Mater.

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Lithium-ion batteries with aluminum anodes had appeared to resolve critical dendrite issues of lithium metal cells in the 1970s. However, the poor cycling performance attributed to aluminum anodes would lead to their obsolescence. In this work, we demonstrate how strategic thermal control in cycling aluminum anodes circumvents the problematic α/β phase transformations that yield poor cycling life. Instead, electrochemical formation of the Li 3 Al 2 and Li 2−x Al phases necessitates temperatures slightly above ambient, as the Li 3 Al 2 and Li 2−x Al phases are key enablers for high capacity and stable cycling. While delivering a competitive capacity level (ca. 1 Ah kg −1 -Al), cycling among those higher-order phases is found to be significantly improved, from several cycles to 100 cycles with ca. 67% capacity retention. Importantly, because modern battery charging is likely to occur above room temperature due to ohmic heating, the thermal conditions explored here are expected to be realized in a variety of applications. Furthermore, we show that elevated temperature is not necessary for aluminum anode delithiation, thus creating additional synergies with many practical scenarios.

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Section: ■ Introductionmentioning

confidence: 99%