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Using the pressure-pulsed chemical vapor infiltration technique, thin pyrocarbon films were coated on the surface of the hard-carbon particles. The crystallinity of pyrocarbon shell was higher than that of the core carbon. The BET surface area and the pores with the diameter of 1.5–5nm were extremely decreased after coating with 7wt.% pyrocarbon. These changes in the nano-scaled structure of carbon...
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