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- W4293224897 abstract "Capacity measurements and related quantities are the first layer of information acquired during testing of Li-ion cells. It is generally considered that elevated values of coulombic efficiency and capacity retention are absolute indicators of the existence of a stable solid electrolyte interphase (SEI). Here, we challenge this notion by analyzing how the effect of side reactions on cell capacity depends on the choice of electrodes. More specifically, we demonstrate that the extent of measurable capacity fade due to SEI growth is modulated by the shape of the voltage profile of the cathode and anode at the end of charge and discharge half-cycles. This shape-dependency creates a mismatch between SEI growth and cell capacity loss, which is relatively small for graphite anodes but sizable for silicon-containing electrodes. We illustrate this point by showing that, at the same coulombic efficiency and capacity retention, cells containing silicon-based materials could actually exhibit rates of SEI growth that are as much as ≥ 40% higher than graphite cells. The main implication of this behavior is that, for certain systems, capacity measurements may be an unreliable source of information about the extent of reactions at the SEI, allowing other consequences of these side reactions (such as electrolyte depletion) to proceed unchecked while the cell appears to be stable." @default.
- W4293224897 created "2022-08-27" @default.
- W4293224897 creator A5064875972 @default.
- W4293224897 date "2022-08-01" @default.
- W4293224897 modified "2023-09-25" @default.
- W4293224897 title "Capacity and Coulombic Efficiency Measurements Underestimate the Rate of SEI Growth in Silicon Anodes" @default.
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- W4293224897 doi "https://doi.org/10.1149/1945-7111/ac8a21" @default.
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