Electrode鈥揈lectrolyte Interface in Li-Ion Batteries: Current Understanding and New Insights

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• 作者：Magali Gauthier ; Thomas J. Carney ; Alexis Grimaud ; Livia Giordano ; Nir Pour ; Hao-Hsun Chang ; David P. Fenning ; Simon F. Lux ; Odysseas Paschos ; Christoph Bauer ; Filippo Maglia ; Saskia Lupart ; Peter Lamp ; Yang Shao-Horn
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：November 19, 2015
• 年：2015
• 卷：6
• 期：22
• 页码：4653-4672
• 全文大小：1242K
• ISSN：1948-7185

文摘

Understanding reactions at the electrode/electrolyte interface (EEI) is essential to developing strategies to enhance cycle life and safety of lithium batteries. Despite research in the past four decades, there is still limited understanding by what means different components are formed at the EEI and how they influence EEI layer properties. We review findings used to establish the well-known mosaic structure model for the EEI (often referred to as solid electrolyte interphase or SEI) on negative electrodes including lithium, graphite, tin, and silicon. Much less understanding exists for EEI layers for positive electrodes. High-capacity Li-rich layered oxides yLi_2鈥?i>xMnO₃路(1鈥?i>y)Li_1鈥?i>xMO₂, which can generate highly reactive species toward the electrolyte via oxygen anion redox, highlight the critical need to understand reactions with the electrolyte and EEI layers for advanced positive electrodes. Recent advances in in situ characterization of well-defined electrode surfaces can provide mechanistic insights and strategies to tailor EEI layer composition and properties.