期刊
ELECTROCHIMICA ACTA
卷 395, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.139149
关键词
Lithium-ion battery; Red phosphorus; Stability; Kramers-Kronig relations; Differential capacity
资金
- US National Science Foundation [1506640, 1611088]
- Florida International University
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1611088] Funding Source: National Science Foundation
The RP-SPAN composite material shows promise for lithium-ion battery applications, but the stability analysis of its dynamic response has not been investigated. The system was found to be highly nonlinear and time-variant at low frequencies, matching the 0.21% average capacity loss per cycle observed in experiments.
Red phosphorus and sulfurized polyacrylonitrile (RP-SPAN) composite has recently shown promising results as an anode material in lithium-ion battery applications. However, the stability analysis of its dynamic response has not been investigated yet. In this study we use the transfer function stability analysis, the Kramers-Kronig (KK) integral relations, and the differential capacity analysis to evaluate the cell's behavior in both frequency and time domains in terms of stationarity, stability, linearity, as well as dissipation and degradation with extended charge/discharge cycling. The results show that the system is highly nonlinear and time-variant at the low-frequencies spectrum which is in line with the 0.21% average capacity loss per cycle computed from consecutive charge/discharge measurements. We propose using a modified constant phase element in which magnitude and phase, and thus real and imaginary parts of the spectral response are decoupled to fit the low-frequency, non-KK-compliant data. (c) 2021 Elsevier Ltd. All rights reserved.
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