材料科学
电解质
多孔性
锂(药物)
化学工程
电流密度
质子化
金属
氧化物
多孔介质
无机化学
电极
复合材料
离子
物理化学
冶金
化学
有机化学
内分泌学
工程类
物理
医学
量子力学
作者
Rabeb Grissa,Lukas Seidl,Walid Dachraoui,Ulrich Sauter,Corsin Battaglia
标识
DOI:10.1021/acsami.2c11375
摘要
Ceramic Li7La3Zr2O12 (LLZO) represents a promising candidate electrolyte for next-generation all-solid-state lithium-metal batteries. However, lithium-metal batteries are prone to dendrite formation upon fast charging. Porous/dense and porous/dense/porous LLZO structures were proposed as a solution to avoid or at least delay the formation of lithium-metal dendrites by increasing the electrode/electrolyte contact area and thus lowering the local current density at the interface. In this work, we show the feasibility of producing porous/dense/porous LLZO by a new and scalable method. The method consists of LLZO chemical deep protonation in a protic or acidic solvent, followed by thermal deprotonation at high temperatures to create the porous structure by water and lithium oxide elimination. We demonstrate that the produced structure extends the lifetime of Li/LLZO/Li symmetric cells by a factor of 8 compared to a flat LLZO at a current density of 0.1 mA/cm2 and with a capacity of 1 mAh/cm2 per half-cycle. We also show clear improvement of the Li/LLZO/LiFePO4 full cell performance with a thermally deprotonated LLZO.
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