Lithium-Sulfur Battery: Design, Characterization, and Physically-based Modeling

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Lithium-Sulfur Battery: Design, Characterization, and Physically-based Modeling ( lithium-sulfur-battery-design-characterization-and-physicall )

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2.5 • 2 • • 400 300 200 100 0 1.5 • 0 0.5 1 1.5 Time / h 0 100 200 300 400 Z’ / Ω · cm2 Figure 3.18: Impedance spectra recorded at regular intervals during discharging. Left: discharge profile. Right: corresponding impedance spectra. Colored spots indicate the times at which each spectrum was recorded. 400 300 200 100 0 3000 2000 1000 0 0 100 200 300 400 500 600 Z’ / Ω·cm2 0 1000 2000 3000 4000 Z’ / Ω·cm2 (a) EIS of several similar, freshly assembled cells. 600 400 200 0 0 200 400 600 800 Z’ / Ω · cm2 (c) EIS of several similar, symmetrical Li/Li cells. (b) EIS of a single cell, recorded every minute during an entire charge/discharge cycle. 1000 500 0 initial 16h rest at 40°C 24h rest at 40°C cycled (fwd) cycled (rev) Figure 3.19: Impedance spectra of similar cells. The purpose of this figure is not to represent the data in detail but to illustrate issues with the reproducibility of the EIS measurements. 58 0 500 1000 1500 2000 Z’ / Ω · cm2 (d) EIS of one Li/Li cell at different times. −Z” / Ω·cm2 −Z” / Ω·cm2 Cell Voltage / V −Z” / Ω·cm2 −Z” / Ω·cm2 −Z” / Ω · cm2

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Lithium-Sulfur Battery: Design, Characterization, and Physically-based Modeling

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