Pressure-pulsed chemical vapor infiltration of pyrolytic carbon into fibrous tin prepared from carbonized paper preform

The plate-type negative electrodes for Li-ion rechargeable battery were prepared by pressure-pulsed chemical vapor infiltration of pyrolytic carbon at 350°C from C₃H₈ (30%)-H₂ into the TiN-based electroconductive forms having the fibrous structure. The electrodes had the three-dimensional current paths in the layers of active materials without the organic binders and the conductive additives. The charge-discharge profiles were similar to that observed in non-graphitizable carbon having disordered structure. Reversible capacity of pyrolytic carbon at current density of 0.2 mA cm^-2 and coulombic efficiency at the first cycle were ∼500mA h g^-1 and ∼72%, respectively. The capacity at current density of 8mA cm^-1 maintained 80% of that at 0.2mA cm^-2.