Investigation of lithium-ion battery degradation mechanisms by combining differential voltage analysis and alternating current impedance
By Jiangong Zhu, Mariyam Susana Dewi Darma, M. Knapp, D. R. Sørensen, M. Heere, Qiaohua Fang, Xueyuan Wang, Haifeng Dai, Liuda Mereacre, A. Senyshyn and 2 more. Journal of Power Sources, 2020
264 citations recorded by the source corpus.
Abstract 18650-type cells with 2.5 Ah capacity are cycled at both 25 °C and 0 °C separately, and at 25 °C two charging protocols (constant current, and constant current-constant voltage charge) are used. Differential voltage analysis (dV/dQ) and alternating current (AC) impedance are mainly used to investigate battery degradation mechanisms quantitatively. The dV/dQ suggests that active cathode loss and loss of lithium inventory (LLI) are the dominating degradation factors. Significant microcracks are observed in the fatigued cathode particles from the scanning electron microscopy (SEM) images. Crystal structure parameters of selected fatigued batteries at fully charged state are determined by in situ high-resolution neutron powder diffraction. Obvious increases of ohmic resistance and solid electrolyte interphase (SEI) resistance occur when the battery capacity fade falls beneath 20%. Continuous charge transfer resistance and Warburg impedance coefficient (W.eff) increase are observed in the course of cycling. Correlation analysis is performed to bridge the gap between material loss as well as LLI and impedance increase. The increase of the charge transfer resistance is related to both active cathode loss and LLI, and a functional relationship is revealed between LLI and W.eff regardless of the used cycling protocols.
Subfields: Automotive Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/15a79000b3a2ee3cd0e61e2a26fd967792d3df28
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Citations in the corpus
- Lithium-Ion Battery Operation, Degradation, and Aging Mechanism in Electric Vehicles: An Overview (2021, background): “Furthermore, in [54], the author analyzed the contribution of the constant voltage process to the battery charging, and charged 18650-type batteries (2.5 Ah, NMC/Graphite, and NCA/Graphite) by the CC (2.5 A to 4.2 V) (Figure 8g) and CC-CV protocols (2.5 A to 4.2 V and 0.1 A cut-off current) at room…”