AI Article Synopsis
- * A new method for calculating the real Coulombic efficiency (CE) during AFLMB cycling shows that lower discharge rates negatively impact Li CE, but higher rates improve its reversibility, suggesting AFLMBs are suited for high-power applications.
- * Despite improvements, AFLMBs still face rapid failures due to Li stripping overpotential; however, applying a zinc coating can enhance electron and ion transfer, indicating a need for focused strategies to optimize AFLMB commercialization.
Article Abstract
Anode-free lithium (Li) metal batteries (AFLMBs) could provide a specific energy over 500 Wh/kg, but their cycle life requires improvement. In this work, we propose a new method to calculate the real Coulombic efficiency (CE) of the Li metal during the cycling of AFLMBs. Through this approach, we find low rate discharging unfavorable for Li CE, which is mitigated through electrolyte optimization. In contrast, high rate discharging boosts Li reversibility, indicating AFLMBs to be intrinsically suited for high power use cases. However, AFLMBs still fail rapidly, due to the Li stripping overpotential buildup, which is mitigated by a zinc coating that enables a better electron/ion transferring network. We believe well-targeted strategies need to be better developed to synergize with the intrinsic features of AFLMBs to enable their commercialization in the future.
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| http://dx.doi.org/10.1021/acsami.2c20422 | DOI Listing |
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