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Ca Metal Batteries and Sn Anode Alloying: Resolving Misconceptions in Ca-Sn Alloy Formation
Saida Cora1, Mingyuan Ge2, Hao Liu3
1Department of Chemistry, University of Massachusetts, Boston, Massachusetts 02125, United States.
ACS Omega
|August 1, 2026
Summary
Developing calcium metal batteries is challenging due to anode passivation. This study reveals that lithium-ion activity can be misinterpreted as calcium alloying in tin anodes, hindering calcium battery development.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Calcium (Ca) metal anodes face passivation issues in electrolytes, limiting their use in batteries.
- Developing alternative anodes, such as alloys, is crucial for advancing calcium metal battery technology.
Purpose of the Study:
- To evaluate the electrochemical formation and Ca alloying potential of a tin (Sn) anode.
- To identify potential experimental artifacts in calcium battery research.
Main Methods:
- Cyclic voltammetry
- Scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDS)
- X-ray diffraction (XRD)
- Synchrotron transmission X-ray microscopy (TXM)
Main Results:
- SEM/EDS suggested Ca-Sn alloy formation, but XRD and TXM revealed significant lithium-ion (Li+) involvement when using Li metal as a reference electrode.
- Li+ kinetics can dominate alloying processes, leading to Li-driven reactions mistaken for Ca alloying.
- Using Ca metal electrodes showed initial redox activity but rapid failure due to Ca passivation and Sn dealloying.
Conclusions:
- The study highlights the risk of misinterpreting Li+ activity as Ca alloying in Sn anodes for calcium batteries.
- Rigorous cell design and careful interpretation are essential for evaluating alloy chemistry in multivalent batteries.
- Findings provide critical insights into limitations and artifacts in calcium metal battery systems.
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