Saffirio Sofia, Darjazi Hamideh, Coller Pascuzzi Marco Etzi, Smeacetto Federico, Gerbaldi Claudio
GLANCE Group, Department of Applied Science and Technology (DISAT), Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129, Torino, Italy.
GAME Lab, Department of Applied Science and Technology (DISAT), Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129, Torino, Italy.
Heliyon. 2024 Jan 11;10(2):e24493. doi: 10.1016/j.heliyon.2024.e24493. eCollection 2024 Jan 30.
The development of Li-ion conducting solid-state electrolytes (SSEs) is crucial to achieve increased energy density, operative reliability, and unprecedented safety to replace the state-of-the-art Li-ion battery (LIB). In this regard, we here present the successful melt-casting synthesis of a MgO-added NASICON-type LAGP glass-ceramic electrolyte with composition LiAlMgGe(PO), namely LAMGP. The effects of three different additional oxides are investigated, with the aim to improve grain cohesion and consequently enhance Li-ion conductivity. Specifically, yttrium oxide (YO, 5 mol%), boron oxide (BO, 0.7 mol%) and silicon oxide (SiO, 2.4 %mol) are added, yielding LAMGP-Y, LAMGP-B and LAMGP-Si, respectively. Their effects are exhaustively compared in terms of thermal, crystalline, structural/morphological and ion conducting features. Among the three oxides, BO is able to positively act on grain boundaries without bringing along grains deformation and insulating secondary phases formation, achieving enhanced ionic conductivity of 0.21 mS cm at 20 °C as compared to 0.08 mS cm for a commercial LAGP subjected to the same thermal treatment. A remarkable anodic oxidation stability up to 4.8 V vs Li/Li is assessed by LAMGP-B system, which accounts for promising prospects for its use in combination with high-energy (high-V) cathodes.
锂离子传导固态电解质（SSEs）的发展对于提高能量密度、操作可靠性以及实现前所未有的安全性以取代现有锂离子电池（LIB）至关重要。在这方面，我们在此展示了一种成功的熔铸合成法，制备出了添加MgO的NASICON型LAGP玻璃陶瓷电解质，其成分为LiAlMgGe(PO)，即LAMGP。研究了三种不同添加氧化物的效果，旨在改善晶粒凝聚力并因此提高锂离子电导率。具体而言，添加了氧化钇（YO，5摩尔%）、氧化硼（BO，0.7摩尔%）和氧化硅（SiO，2.4摩尔%），分别得到LAMGP-Y、LAMGP-B和LAMGP-Si。从热学、晶体学、结构/形态学和离子传导特性方面对它们的效果进行了详尽比较。在这三种氧化物中，BO能够对晶界产生积极作用，而不会导致晶粒变形和绝缘第二相形成，与经过相同热处理的商用LAGP相比，在20°C时实现了0.21 mS cm的增强离子电导率，而商用LAGP的离子电导率为0.08 mS cm。LAMGP-B体系评估出在相对于Li/Li高达4.8 V时具有显著的阳极氧化稳定性，这表明其与高能量（高电压）阴极结合使用具有广阔前景。
