パルスCVI法による低温焼成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

Abstract

Using pressure-pulsed chemical vapor deposition (PCVD) technique，pyrolytic carbon (pyrocarbon) was coated at 800℃ from C3H8(30%)-N2 gas system on the carbon paper substrate carbonized at 800℃. It was revealed from XRD that the crystallinity of pyrocarbon was higher than that of carbon paper. BET surface area was decreased from 361 m2 g-1 of the original substrate to 2.3 m2 g-1 of the pyrocarbon-coated sample. High irreversible capacity of 550 mA h g-1 was observed in the original carbonized paper，reflecting the disordered structure and high surface area. Irreversible capacity was reduced to 150 mA h g-1 by coating with 8 mass% pyrocarbon， which would be attributed to high crystallinity and low surface area of pyrocarbon. 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.