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Dynamic formation of a solid-liquid electrolyte interphase and its consequences for hybrid-battery concepts
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Dynamic formation of a solid-liquid electrolyte interphase and its consequences for hybrid-battery concepts
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Dynamic formation of a solid-liquid electrolyte interphase and its consequences for hybrid-battery concepts
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Journal Article
Dynamic formation of a solid-liquid electrolyte interphase and its consequences for hybrid-battery concepts
2016
Overview
The discharging and charging of batteries require ion transfer across phase boundaries. In conventional lithium-ion batteries, Li
+
ions have to cross the liquid electrolyte and only need to pass the electrode interfaces. Future high-energy batteries may need to work as hybrids, and so serially combine a liquid electrolyte and a solid electrolyte to suppress unwanted redox shuttles. This adds new interfaces that might significantly decrease the cycling-rate capability. Here we show that the interface between a typical fast-ion-conducting solid electrolyte and a conventional liquid electrolyte is chemically unstable and forms a resistive solid-liquid electrolyte interphase (SLEI). Insights into the kinetics of this new type of interphase are obtained by impedance studies of a two-chamber cell. The chemistry of the SLEI, its growth with time and the influence of water impurities are examined by state-of-the-art surface analysis and depth profiling.
Li
+
-selective solid electrolytes may enable next-generation battery systems, such as Li–S and Li–O
2
. Now, in an exemplar system, it is shown that a resistive interphase forms at the interface between solid and liquid electrolytes, termed the solid-liquid electrolyte interphase (SLEI). An
in situ
study of this undesirable effect is supported by state-of-the-art surface analysis.
