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We have utilized synchrotron X-ray radiation to perform an 'in situ' X-ray diffraction study on a Li 1-x CoO 2 cathode in a Li Li 1-x CoO 2 cell. The cell was charged at a C/10 rate from 3.5 to 5.2 V. In the composition range of x=0 to x=0.5, a new intermediate phase H2a was observed in addition to the two expected hexagonal phases, H1 and H2. In...
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