Nonpassivated Silicon Anode Surface

• DOI: 10.1021/acsami.0c03799
• Publication Date: 2020-05-15T20:20:09Z
• Authors: Yanli Yin; Elisabetta Arca; Luning Wang; Guang Yang; Manuel Schnabel; Lei Cao; Chuanxiao Xiao; Hongyao Zhou; Ping Liu; Jagjit Nanda; Glenn Teeter; Bryan Eichhorn; Kang Xu; Anthony Burrell; Chunmei Ban
• Keywords: Passivation

A stable solid electrolyte interphase (SEI) has been proven to be a key enabler most advanced battery chemistries, where the reactivity between and anode operating beyond stability limits must kinetically suppressed by such SEIs. The graphite used in state-of-the-art Li-ion batteries presents representative SEI example. Because of similar operation potentials silicon (Si), passivation mechanism thought apply on Si when using same carbonate-based electrolytes. In this work, we found that chemical formation process proto-SEI is closely entangled with incessant decomposition, detachment, reparation, which lead continuous lithium consumption. Using special galvanostatic protocol designed observe prior lithiation, were able deconvolute electrochemical dynamic from morphology mechanical complexities showed pristine could not fully passivated