Assessment of Critical Stack Pressure and Temperature in Li-Garnet Batteries
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Date
2024-03-14
Publication Type
Journal Article
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Abstract
Stack pressure and temperature serve as effective means to induce deformation of the lithium metal anode toward the Li/solid-state-electrolyte interface, thereby mitigating the well-known issue of void formation during high-current-density stripping. In this study, a compelling methodology is systematically assessed for determining the critical stack pressure and temperature of Li metal anode in conjunction with Li7La3Zr2O12 (LLZO) solid-state electrolyte, which is the minimum set of values required to maintain conformal contact between Li and LLZO at a given current density. The methodology is based on the analysis of the second derivatives of the voltage profiles of identical Li/LLZO/Li symmetric cells measured during one half-cycle (3 mAh cm-2) at the same current density but different stack pressures. The effectiveness of the presented approach in assessing conditions for mitigating void formation during Li stripping is evaluated through cycle stability tests performed on Li/LLZO/Li symmetric cells.
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published
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Journal / series
Volume
11 (8)
Pages / Article No.
2300948
Publisher
Wiley-VCH
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Subject
critical stack pressure; Li metal anode; LLZO solid-state electrolyte; solid-state batteries; void formation
Organisational unit
03934 - Kovalenko, Maksym / Kovalenko, Maksym