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Diallo, Mouhamad S; Shi, Tan; Zhang, Yaqian; Peng, Xinxing; Shozib, Imtiaz; Wang, Yan; Miara, Lincoln J; Scott, Mary C; Tu, Qingsong Howard; Ceder, Gerbrand
Nature communications, 01/2024, Letnik: 15, Številka: 1Journal Article
Despite the potentially higher energy density and improved safety of solid-state batteries (SSBs) relative to Li-ion batteries, failure due to Li-filament penetration of the solid electrolyte and subsequent short circuit remains a critical issue. Herein, we show that Li-filament growth is suppressed in solid-electrolyte pellets with a relative density beyond ~95%. Below this threshold value, however, the battery shorts more easily as the density increases due to faster Li-filament growth within the percolating pores in the pellet. The microstructural properties (e.g., pore size, connectivity, porosity, and tortuosity) of Formula: see text with various relative densities are quantified using focused ion beam-scanning electron microscopy tomography and permeability tests. Furthermore, modeling results provide details on the Li-filament growth inside pores ranging from 0.2 to 2 μm in size. Our findings improve the understanding of the failure modes of SSBs and provide guidelines for the design of dendrite-free SSBs.
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