Dynamic formation of a solid-liquid electrolyte interphase and its consequences for hybrid-battery concepts
Dynamic formation of a solid-liquid electrolyte interphase and its consequences for hybrid-battery concepts
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固液电解质界面的动态形成及其对混合电池概念的影响
DOI：
10.1038/nchem.2470
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发表时间：
2016-05-01
期刊：
影响因子：
21.8
通讯作者：
Janek, Juergen
中科院分区：
文献类型：
--
作者：
Busche, Martin R.;Drossel, Thomas;Janek, Juergen
电池的放电和充电需要跨越相界的离子转移。在传统的锂离子电池中，Li+离子必须穿过液体电解液，只需通过电极界面。未来的高能电池可能需要以混合电池的形式工作，因此将液体电解液和固体电解液串联起来，以抑制不必要的氧化还原穿梭。这添加了可能会显著降低循环速率能力的新接口。在这里，我们证明了典型的快离子导电固体电解质和常规液体电解质之间的界面在化学上是不稳定的，并形成了阻性固-液电解质界面(SLi)。通过对两室电池的阻抗研究，获得了对这种新型界面相动力学的深入了解。通过最先进的表面分析和深度剖面分析，研究了冰盖的化学成分、随时间增长的情况以及水杂质的影响。
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.