In situ atomic force microscopy study of exfoliation phenomena on graphite basal planes |
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Affiliation: | 1. Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;2. Department of Chemistry and Biochemistry, University of Bern, CH-3012 Bern, Switzerland |
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Abstract: | In situ atomic force microscopy (AFM) was used to study the morphology changes of a highly oriented pyrolytic graphite (HOPG) electrode modeling the negative electrode used in commercial lithium-ion batteries. During the charge (lithiation) process in 1 M LiClO4 in ethylene carbonate:propylene carbonate (1:2) electrolyte we found that, degradation processes similar to the exfoliation of graphite also occur on basal planes. First a web-like structure of fine cracks develops which eventually results in local blister formation. |
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