To enhance charging discharging cycle characteristics by forming a coating film containing Si or its compound and a coating film forming agent which is carbonized by heat treatment and contains no halogen, and sintering the coating film under a non-oxidizing atmosphere at a specified temperature to integrate with the current collector.
As an Si compound, silicon oxide and silicone resin are listed, and converted into Si by decomposition or reduction in a non-oxidizing atmosphere. As a coating film forming agent, a material having a function of holding a shape of a coating film and a function of ensuring adhesion with a current collector and containing no halogen is used, and usual thermoplastic resin, a rubber like polymer, and thermosetting resin are listed. The content of residual carbon after heat treatment of the coating film forming agent is preferable to be 5 wt.% or more. As a binder or an adhesive, thermoplastic resin is preferable, and since the thermosetting resin is preferable to raise the content of the residual carbon, both resins are mixed to adjust the content of residual carbon. The sintering temperature of the coating film is preferable to be 400-800°C.
NISHIMURA TORU
SHIGA FUMIHIDE
SUZUKI ATSUSHI
