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                                A transmission electron microscopy study of crack formation and propagation in electrochemically cyc
                                發布時間:2014/9/2瀏覽:1834次
                                 Subsurface defects and local compositional changes that occurred in graphite anodes subjected to cyclic
                                voltammetry tests (vs. Li/Li+, using an electrolyte consisting of 1 M LiClO4 in a 1:1 volumetric mixture
                                of ethylene carbonate and 1,2-dimethoxy ethane) were investigated using high-resolution transmission
                                electron microscopy (HR-TEM). Cross-sections of anodes prepared by focused ion beam (FIB) milling
                                indicated that graphite layers adjacent to solid electrolyte (SEI)/graphite interface exhibited partial
                                delamination due to the formation of interlayer cracks. The SEI layer formed on the graphite surface consisted
                                of Li2CO3 that was identified by
                                {1 1 0}
                                and
                                {0 0 2}
                                crystallographic planes. Lithium compounds,
                                LiC6, Li2CO3 and Li2O, were observed on the surfaces of separated graphite layers. Deposition of these cointercalation
                                compounds near the crack tip caused partial closure of propagating graphite cracks during
                                electrochemical cycling, and possibly reduced the crack growth rate. Graphite fibres that were observed
                                to bridge crack faces likely provided an additional mechanism for the retardation of crack propagation.
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