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Chemical delithiated Li x CoO 2 (x=1, 0.7, 0.66 and 0.57) has been synthesized by using a strong oxidant, NaS 2 O 8 . The structure investigations indicate that all the samples remain with hexagonal cells, which have expansion of c axis during Li extraction. Transmission electron microscopy (TEM) observations revealed the presence of superstructures arising from intercalated...
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