材料科学
复合数
电解质
扫描电子显微镜
阴极
氧化物
化学工程
锂(药物)
烧结
离子
陶瓷
扫描透射电子显微镜
二次离子质谱法
快离子导体
复合材料
物理化学
分析化学(期刊)
冶金
电极
化学
内分泌学
工程类
物理
色谱法
医学
量子力学
作者
Jean Philippe Beaupain,Katja Waetzig,Svenja‐K. Otto,Anja Henß,Jürgen Janek,Michael Malaki,Anuj Pokle,Julian Müller,Benjamin Butz,Kerstin Volz,Mihails Kusnezoff,Alexander Michaelis
标识
DOI:10.1021/acsami.1c11750
摘要
All solid-state batteries offer the possibility of increased safety at potentially higher energy densities compared to conventional lithium-ion batteries. In an all-ceramic oxide battery, the composite cathode consists of at least one ion-conducting solid electrolyte and an active material, which are typically densified by sintering. In this study, the reaction of the solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 (LATP) and the active material LiNi0.6Co0.2Mn0.2O2 (NCM622) is investigated by cosintering at temperatures between 550 and 650 °C. The characterization of the composites and the reaction layer is performed by optical dilatometry, X-ray diffractometry, field emission scanning electron microscopy with energy dispersive X-ray spectroscopy, time-of-flight secondary ion mass spectrometry, as well as scanning transmission electron microscopy (STEM). Even at low sintering temperatures, elemental diffusion occurs between the two phases, which leads to the formation of secondary phases and decomposition reactions of the active material and the solid electrolyte. As a result, the densification of the composite is prevented and ion-conducting paths between individual particles cannot be formed. Based on the experimental results, a mechanism of the reactions in cosintered LATP and NCM622 oxide composite cathodes is suggested.
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