4.7 Article

In-situ observations of lithiation/de-lithiation induced graphite damage during electrochemical cycling

期刊

SCRIPTA MATERIALIA
卷 64, 期 2, 页码 165-168

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2010.09.035

关键词

Carbon and graphite; In-situ optical microscopy; Electrochemistry; Lithium-ion batteries; Surface damage

资金

  1. Natural Sciences and Engineering Research Council of Canada (NSERC)

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Damage that occurs on graphite electrode surfaces during electrochemical cycling, simulating lithium-ion battery conditions, was observed in-situ using a digital microscope. Microscopical evidence revealed particle removal during the de-lithiation stage that continued until the potential difference, exerted on graphite, reduced beyond a critical value. The rate of graphite particle loss increased at a lower voltage scan rate. Experiments, initiating from the peak voltage, promoted formation of a surface film on graphite which reduced graphite degradation during the course of lithiation. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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