Communication—Effect of Lower Cutoff Voltage on the 1^st Cycle Performance of Silicon Electrodes

Journal Article · 11 January 2019 · Journal of the Electrochemical Society

DOI: https://doi.org/10.1149/2.0111902jes · OSTI ID:1498096

Tornheim, Adam  ^[1]; Trask, Stephen E.  ^[1]; Zhang, Zhengcheng  ^[1]

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1. Argonne National Lab. (ANL), Lemont, IL (United States)

Here, silicon electrodes were cycled once to determine the effect of lower cutoff voltage (LCV) on the irreversible capacity and Li₁₅Si₄ phase presence for a protocol that incorporated a potentiostatic hold at the LCV. Cells lithiated below 90 mV showed indications of the crystalline Li₁₅Si₄ peak, which was absent for cells with lower cutoff voltages above 90 mV. Irreversible capacity loss was independent of the LCV used. While higher LCVs led to lower capacities, this capacity could be recovered with longer potentiostatic holds. Lastly, these longer holds did not lead to Li₁₅Si₄ formation.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1498096
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 2 Vol. 166; ISSN 0013-4651
• Publisher: The Electrochemical SocietyCopyright Statement
• Country of Publication: United States
• Language: English