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

• Main Authors: Lux, Simon F. (Author), Paschos, Odysseas (Author), Bauer, Christoph (Author), Maglia, Filippo (Author), Lupart, Saskia (Author), Lamp, Peter (Author), Gauthier, Magali Aurelie Marie (Contributor), Carney, Thomas Joseph (Contributor), Grimaud, Alexis (Contributor), Giordano, Livia (Contributor), Pour, Nir (Contributor), Chang, Hao Hsun (Contributor), Fenning, David P (Contributor), Shao-Horn, Yang (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Materials Science and Engineering (Contributor), Massachusetts Institute of Technology. Department of Mechanical Engineering (Contributor), Massachusetts Institute of Technology. Research Laboratory of Electronics (Contributor)
• Format: Article
• Language: English
• Published: American Chemical Society (ACS), 2017-06-02T16:19:15Z.
• Subjects: Article
• Online Access: Get fulltext

 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[subscript 2-x]MnO[subscript 3]·(1-y)Li[subscript 1-x]MO[subscript 2], 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.