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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Redox-active cathode interphases in solid-state batteries
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Redox-active cathode interphases in solid-state batteries

机译：氧化还原活性阴极间在固态电池中互相

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摘要

All-solid-state batteries are expected to provide a next-generation solution for energy storage. Employing fast conducting lithium thiophosphates as a replacement for liquid electrolytes in conventional lithium ion batteries has shown great promise, however, capacity fading and the underlying interfacial side reactions of thiophosphates and cathode active materials are not yet understood well. In this study, we charge solid-state batteries to different cut-off potentials and find the formation of a redox-active resistive layer in the solid electrolyte, which impedes the conductivity depending on the state-of-charge of the battery. Using electrochemical impedance spectroscopy as well as depth profiling with X-ray photoelectron spectroscopy we find a thick passivation layer at the current collector and decomposition products within the cathode composite. In addition, an in situ electrochemical experiment during X-ray photoelectron spectroscopy shows that the solid electrolyte is redox active at the cathode/solid electrolyte interface in solid-state batteries. This work highlights the importance of protecting interface layers at the current collector, and the influence of the resulting electric potential drop, as well as provides insight into the redox chemistry of lithium conducting thiophosphates.
机译：预计全固态电池将为能量存储提供下一代解决方案。使用快速导电硫磷酸锂作为常规锂离子电池中的液体电解质的替代，已经显示出很大的希望，然而，尚未理解硫代磷酸盐和阴极活性材料的容量衰落和潜在的界面反应。在这项研究中，我们将固态电池充电到不同的截止电位，并在固体电解质中找到氧化还原活性电阻层的形成，这根据电池的充电而阻碍导电性。使用电化学阻抗光谱以及与X射线光电子能谱的深度分析，我们在集电器和阴极复合材料内的分解产物中找到厚的钝化层。另外，X射线光电子能谱期间的原位电化学实验表明，固体电解质在固态电池中的阴极/固体电解质界面处是氧化还原。这项工作突出了保护界面层在集电器处保护界面层的重要性，以及所产生的电势下降的影响，以及对导电锂磷酸锂的氧化还原化学的洞察力。

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