期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 8, 页码 9277-9291出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b21404
关键词
all-solid-state batteries; thiophosphate solid electrolyte; 3D microstructure-resolved simulations; nickel-rich layered oxides; impedance analysis; microcomputer tomography
资金
- Federal Ministry of Education and Research (BMBF) [03XP0026F, 03XP0026J, 03XP0174C, 03XP0177A]
- state of Baden-Wurttemberg through bwHPC (bwForCluster JUS-TUS)
- EPSRC [EP/M02833X/1]
- EPSRC [EP/M02833X/1] Funding Source: UKRI
All-solid-state batteries (ASSBs) present a promising route toward safe and high-power battery systems in order to meet the future demands in the consumer and automotive market. Composite cathodes are one way to boost the energy density of ASSBs compared to thin-film configurations. In this manuscript, we investigate composites consisting of beta-Li3PS4 (beta-LPS) solid electrolyte and high-energy Li(Ni0.6Mn0.2Co0.2)O-2 (NMC622). The fabricated cells show a good cycle life with a satisfactory capacity retention. Still, the cathode utilization is below the values reported in the literature for systems with liquid electrolytes. The common understanding is that interface processes between the active material and solid electrolyte are responsible for the reduced performance. In order to throw some light on this topic, we perform 3D microstructure-resolved simulations on virtual samples obtained via X-ray tomography. Through this approach, we are able to correlate the composite microstructure with electrode performance and impedance. We identify the low electronic conductivity in the fully lithiated NMC622 as material inherent restriction preventing high cathode utilization. Moreover, we find that geometrical properties and morphological changes of the microstructure interact with the internal and external interfaces, significantly affecting the capacity retention at higher currents.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据