X-ray absorption spectromicroscopy gives access to Li1+xAlxGe2−x(PO4)3 (LAGP) local degradation at the anode-electrolyte interface

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2022-11-01 DOI:10.1016/j.powera.2022.100106
Majid Kazemian , Maya Kiskinova , Benedetto Bozzini
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引用次数: 1

Abstract

Batteries with inorganic solid-state electrolytes (ISSE) are attracting notable interest for next-generation systems implementing Lithium (Li) metal anodes, in view of achieving higher energy densities combined with superior safety. Notwithstanding extensive research and development work, this technology is not yet ready for industrial implementation, one of the key challenges being the stability of ISSEs, chiefly at the anodic interface. This work attacks this issue for the specific case of the LAGP/Li (Lithium Aluminium Germanium Phosphate/Lithium) interface with a micro-spectroscopic approach centred on post mortem Scanning Transmission X-ray Microscopy (STXM) of intact LMO/LAGP/Li thin-film batteries, microfabricated in discharged state. Pristine and cycled cells were mapped to pinpoint morphochemical changes, induced by electrochemical ageing. The evidenced shape changes, corresponding to mechanical damaging of the solid/solid electrodic interfaces correlate with LAGP decomposition at the anode, leading to reduction of Ge, whereas the chemical state at the cathodic interface is preserved. Thanks to its submicron spacial resolution, the STXM at the Ge L-edge and O K-edge spectra allowed to assess the highly localized nature of the chemical transformation of LAGP and its correlation with the formation of Li outgrowth features.

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x射线吸收光谱显微镜可以在阳极-电解质界面处获得Li1+xAlxGe2−x(PO4)3 (LAGP)的局部降解
无机固态电解质(ISSE)电池在下一代锂(Li)金属阳极系统中引起了人们的极大兴趣,因为它可以实现更高的能量密度和更高的安全性。尽管进行了大量的研究和开发工作,但该技术尚未为工业应用做好准备,其中一个关键挑战是isse的稳定性,主要是在阳极界面。这项工作针对LAGP/Li(磷酸锂铝锗/锂)界面的具体情况,采用微光谱方法,集中于完整的LMO/LAGP/Li薄膜电池的死后扫描透射x射线显微镜(STXM),在放电状态下进行微加工。原始细胞和循环细胞被定位,以查明由电化学老化引起的形态化学变化。所证实的形状变化,对应于固体/固体电界面的机械损伤,与阳极的LAGP分解相关,导致Ge的减少,而阴极界面的化学状态保持不变。由于其亚微米的空间分辨率,STXM在Ge l边和O k边光谱上可以评估LAGP化学转化的高度局域性及其与Li生长特征形成的相关性。
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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
期刊最新文献
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