800℃で炭素化した炭素紙への熱分解炭素コーティングとリチウムイオン電池負極特性

概要

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Using the pressure-pulsed chemical vapor deposition (PCVD) technique, pyrolytic carbon (pyrocarbon) was deposited at 800°C from a C3H8 (30%)–N2 gas system on a carbon paper substrate carbonized at 800°C. The XRD results revealed that the crystallinity of the pyrocarbon was higher than that of the carbon paper. The BET surface area decreased from 361 m2 g−1 for the original substrate to 2.3 m2 g−1 for the pyrocarbon-coated sample. A high irreversible capacity of 550 mA h g−1 was observed for the original carbonized paper, reflecting the disordered structure and high surface area. This irreversible capacity was reduced to 150 mA h g−1 by coating with 8 mass% pyrocarbon, which could be attributed to the high crystallinity and low surface area of the pyrocarbon. The reversible capacity of the sample coated with 8 mass% pyrocarbon was 597 mA h g−1, which was higher than that of the original carbon paper.