▎ 摘　　要

NOVELTY - A carbonized material consisting of carbon graphene obtained by high-temperature carbonization of powder, such as timber and coconut husk, at 750-1200 degrees C, pressurized, and solid-shaped, is used as base material. A depolarization material, manganese oxide, nickel hydroxide, nitrogen carbide, etc. are added to powder-form or microparticles of carbon graphene, and the mixture is molded into a plate to obtain a carbonized graphene composite. USE - Manufacture of carbonized graphene composite for electrodes of secondary batteries e.g. fuel-cell type secondary batteries and lithium ion-air secondary batteries (all claimed). ADVANTAGE - The method is economical, as waste materials, such as timber, are used effectively. The obtained composite provides safe and compact batteries having excellent output characteristics. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for water electrolysis-synthesis type secondary battery consisting of a positive electrode and a negative electrode. The carbonized graphene composite is immersed in an electrolyte solution through a separator and set as positive electrode which carries out absorption-discharge of hydroxide ions produced during electrolysis by supply of electricity. The negative electrode carries out absorption-redischarge of hydrogen ions equally produced during electrolysis. DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the secondary battery. (Drawing includes non-English language text)