Evolution of the Solid-Electrolyte Interphase on Carbonaceous Anodes Visualized by Atomic-Resolution Cryogenic Electron Microscopy.

Autor:	Huang W; Department of Materials Science and Engineering , Stanford University , Stanford , California 94305 , United States., Attia PM; Department of Materials Science and Engineering , Stanford University , Stanford , California 94305 , United States., Wang H; Department of Materials Science and Engineering , Stanford University , Stanford , California 94305 , United States., Renfrew SE; Energy Storage and Distributed Resources Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.; Department of Chemical and Biomolecular Engineering , University of California , Berkeley , California 94720 , United States., Jin N; Department of Materials Science and Engineering , Stanford University , Stanford , California 94305 , United States., Das S; Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States., Zhang Z; Department of Materials Science and Engineering , Stanford University , Stanford , California 94305 , United States., Boyle DT; Department of Chemistry , Stanford University , Stanford , California 94305 , United States., Li Y; Department of Materials Science and Engineering , Stanford University , Stanford , California 94305 , United States., Bazant MZ; Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States., McCloskey BD; Energy Storage and Distributed Resources Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.; Department of Chemical and Biomolecular Engineering , University of California , Berkeley , California 94720 , United States., Chueh WC; Department of Materials Science and Engineering , Stanford University , Stanford , California 94305 , United States.; Stanford Institute for Materials and Energy Sciences , SLAC National Accelerator Laboratory , 2575 Sand Hill Road , Menlo Park , California 94025 , United States., Cui Y; Department of Materials Science and Engineering , Stanford University , Stanford , California 94305 , United States.; Stanford Institute for Materials and Energy Sciences , SLAC National Accelerator Laboratory , 2575 Sand Hill Road , Menlo Park , California 94025 , United States.
Jazyk:	angličtina
Zdroj:	Nano letters [Nano Lett] 2019 Aug 14; Vol. 19 (8), pp. 5140-5148. Date of Electronic Publication: 2019 Jul 23.
DOI:	10.1021/acs.nanolett.9b01515
Abstrakt:	The stability of modern lithium-ion batteries depends critically on an effective solid-electrolyte interphase (SEI), a passivation layer that forms on the carbonaceous negative electrode as a result of electrolyte reduction. However, a nanoscopic understanding of how the SEI evolves with battery aging remains limited due to the difficulty in characterizing the structural and chemical properties of this sensitive interphase. In this work, we image the SEI on carbon black negative electrodes using cryogenic transmission electron microscopy (cryo-TEM) and track its evolution during cycling. We find that a thin, primarily amorphous SEI nucleates on the first cycle, which further evolves into one of two distinct SEI morphologies upon further cycling: (1) a compact SEI, with a high concentration of inorganic components that effectively passivates the negative electrode; and (2) an extended SEI spanning hundreds of nanometers. This extended SEI grows on particles that lack a compact SEI and consists primarily of alkyl carbonates. The diversity in observed SEI morphologies suggests that SEI growth is a highly heterogeneous process. The simultaneous emergence of these distinct SEI morphologies highlights the necessity of effective passivation by the SEI, as large-scale extended SEI growths negatively impact lithium-ion transport, contribute to capacity loss, and may accelerate battery failure.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu