In-situ measurements of mechanical and volume change of LiCoO2 lithium-ion batteries during repeated charge–discharge cycling by using digital image correlation

Abstract

In-situ morphological evolution of displacement in pouch-type commercial lithium-ion batteries during multiple fifty-five electrochemical charging-discharging cycles was measured via digital image correlation technique. The maximum principal strain on the battery surface reached 0.35% during 55 cycles. The whole volume change analysis of LIBs shows that the maximum volume change rate arrives at 4.27% at the fully 52 nd charging end, and the maximum residual volume change rate is about 2.89% at the 54 th discharging end. The surface morphologies of cathodes and anodes before and after electrochemical cycling were observed by scanning electron microscopy. The elastic modulus of the copper foil in LIBs decrease from as-received 16.7 GPa to 10.6 GPa after 55 cycles by using tensile tests.

Micron-sized single-crystal cathodes for sodium-ion batteries

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Operando Pressure Measurements Reveal Solid Electrolyte Interphase Growth to Rank Li-Ion Cell Performance

“…Cell-stack volume expansion has previously been measured with thickness evolution measurements at a constant load using specialized in-situ force-displacement cells 37,38 and with in-situ pressure measurements using strain gauges mounted on cylindrical-type cells 39 to understand electrode swelling during cycling and electrode degradation. Further measurements to probe the reversible expansion of insertion electrodes used in Li-ion cells as well as the irreversible expansion concomitant with prolonged cycling have been performed with in-situ atomic force microscopy, 11 electrochemical dilatometry, 16,[40][41][42] 3D digital image correlation, 43,44 and mechanical stress measurements. [45][46][47] In this work, we present operando pressure measurements performed on constrained machine-made pouch cells tested under commercially relevant conditions as a technique to investigate the degradation of Li-ion cells with various electrode-electrolyte chemistries, specifically cells with different silicon composite negative electrodes.…”

Developments in X-ray tomography characterization for electrochemical devices

“…The nature of "four-dimensional" data allows for the additional analysis through computational methods such as digital volume correlation (DVC), whereby 3D datasets obtained from the same region of interest can be directly compared in order to track the movement of individual features in the production of displacement vectors. [91,92]. DVC has also been used to explore the bulk electrode strain and material displacement within an 18650 cell during failure [93].…”