Local electrical degradations of solid-state electrolyte by nm-scale operando imaging of ionic and electronic transports

JOURNAL OF POWER SOURCES

卷:481

Article

Jiang, C. -S.¹  Yin, Y.¹  Guthrey, H.¹  Park, K.¹  Lee, S. -H.²  Al-Jassim, M. M.¹ 

[1] Natl Renewable Energy Lab NREL, Golden, CO 80401 USA

[2] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA

关键词: Solid-state electrolyte;    Solid-state battery;    Atomic force microscopy;    Ionic and electronic transport;    Degradation;   

DOI  :  10.1016/j.jpowsour.2020.229138

来源: Elsevier

【 摘 要 】

We report on degradation mechanisms of solid-state electrolyte (SSE) based on insights from nm-scale ionic conduction and electronic leakage for solid-state batteries. The significantly different local degradations revealed by nm-scale ionic and electronic transport imaging demonstrate the need for this nm-scale investigation. State-of the-art lithium-ion conductive glass ceramic (Li2O-Al2O3-SiO2-P2O5-TiO2-GeO2) SSE shows at least two types of degradations spatially separated within the SSE, namely: (1) ionic conduction blocking and slight electronic leaking and (2) highly electronic shunting. Degradation was significantly suppressed by application of a Licontaining polyacrylonitrile thin coating on both sides of the ceramic SSE. With this coating, the ionic conduction was not reduced by the extensive cycling; instead, it improved slightly, although accompanied by a slight increase in electronic leaking. Our nm-scale transport imaging was achieved using an atomic force microscopy (AFM)-based half-cell setup and a logarithmic-scale amplifier with current sensitivity down to the fA (10-15 A) range. This half-cell setup consisting of an AFM-probe/SSE/Li structure can distinguish the ionic from the electronic current by flipping the bias-voltage polarity. This nm-scale operando imaging opens up novel characterization of ionic and electronic transport in the field of solid-state batteries.

【 授权许可】

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