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- W4308139048 abstract "Capacity and coulombic efficiency are often used to assess the performance of Li-ion batteries, under the assumption that these quantities can provide direct insights about the rate of electron consumption due to growth of the solid electrolyte interphase (SEI). Here, we show that electrode properties can actually change the amount of information about aging that can be directly retrieved from capacity measurements. During cycling of full-cells, only portions of the voltage profiles of the positive and negative electrodes are accessible, leaving a reservoir of cyclable Li + stored at both electrodes. The size and availability of this reservoir depends on the shape of the voltage profiles, and accessing this extra Li + can offset some of the capacity that is consumed by the SEI. Consequently, capacity and efficiency measurements can, at times, severely underestimate the rate of side reactions experienced by the cell. We show, for example, that a same rate of SEI growth would cause faster capacity fade in LiFePO 4 than in NMC cells, and that the perceived effects of aging depend on testing variables such as depth of discharge. Simply measuring capacity may be insufficient to gauge the true extent of aging endured by Li-ion batteries." @default.
- W4308139048 created "2022-11-08" @default.
- W4308139048 creator A5064875972 @default.
- W4308139048 date "2022-11-01" @default.
- W4308139048 modified "2023-09-30" @default.
- W4308139048 title "Coulombic Efficiency and Capacity Retention are Not Universal Descriptors of Cell Aging" @default.
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- W4308139048 doi "https://doi.org/10.1149/1945-7111/ac9f7e" @default.
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