Effects of volume variations under different compressive pressures on the performance and microstructure of all-solid-state batteries

Elucidating the Role of Microstructure in Thiophosphate Electrolytes – a Combined Experimental and Theoretical Study of β‐Li3PS4

“…Although sulfides are known to be ductile, they become glassy and brittle when densified. [ 12 , 43 , 44 , 45 ] An increase in pressure resulted in broken pellets, especially for the highly porous samples. Therefore, the applied pressure was maintained identical for all samples, to show that at given conditions the particle morphology has an impact on the pellet porosity.…”

A critical discussion on the analysis of buried interfaces in Li solid-state batteries. Ex situ and in situ/operando studies

“…68 This effect was tentatively attributed to the less efficient pressure holding the operando cell and it should be more critical for SSBs made of fully inorganic solid electrolyte, where the applied pressure seems to have a stronger influence to decrease porosity and favour intimate contact between solid electrolyte and active material. 69 Finally, residual analytical signal from the current collector material can partially overlap signals from materials inside the composite cathode disturbing the interpretation of some results. For instance, the Fe 3p peak in the XPS spectrum of a stainless steel mesh, like the one employed by Mario El Kazzi and coworkers, has similar binding energy to the Li 1s peak.…”

“…SEM, alone or in combination with EDS, is the most popular technique for the ex situ analysis of cross-sections in SSBs. There are numerous examples in the literature on the utilization of this electron microscopy to visualise cross-sections prepared by FIB, [78][79][80] BIB polishing 63,69 or mechanical cut. 47 Since a comprehensive compilation of all these reports is out of the scope of this perspective and the amount of information collected from this method is rather limited, we will focus on the potential of FIB-SEM tomography as a valuable and lessexplored tool to gain access to the mechanical evolution of the morphology of composite electrodes at different stages of their cyclelife.…”

A practical approach to predict volume deformation of lithium‐ion batteries from crystal structure changes of electrode materials

“…[4][5][6] However, lithium-ion batteries suffer from volume deformation during operation, which will lead to increased stress inside the module or pack and then affect battery cycle life and even safety. [7][8][9][10][11] Therefore, efforts are required to investigate the volume deformation of lithium-ion batteries.…”

“…In recent years, to extend the total driving range of electric vehicles, battery, and vehicle manufacturers are increasing the energy density of battery systems by packing cells closely 4‐6 . However, lithium‐ion batteries suffer from volume deformation during operation, which will lead to increased stress inside the module or pack and then affect battery cycle life and even safety 7‐11 . Therefore, efforts are required to investigate the volume deformation of lithium‐ion batteries.…”