| 摘要 |
PROBLEM TO BE SOLVED: To provide a carbonaceous negative electrode material having a large charging and discharging capacity and having a large number of time of charging and discharging by performing the infusible treatment to a carbon precursor in the oxidizing atmosphere, and thereafter, carbonizing it. SOLUTION: A pitch of the aromatic compound, which can react for electrophilic substitution, such as condensed heterocyclic compound, aromatic group oil, petroleum group and cokes group is made to react with bifunctional cross linking agent such as aromatic dimethylene halide, aromatic dimethanol, aromatic dicarbonyl halide and aromatic aldehyde in the existence of acid catalyst so as to obtain carbon precursor. At this stage, this precursor is crushed, and infusible treatment is performed in the oxidizing atmosphere. Thereafter, heating is performed in the non-oxidizing atmosphere for carbonizing so as to obtain the carbonaceous negative electrode material. At the time of infusible treatment, oxygen gas, ozone gas and NOx gas is used as the oxidizing gas, and a treatment is performed within a range at 50 deg.C/min. or less of temperature rising speed and within a range at 200-450 deg.C of heating temperature. Yield of fixed carbon at the time of carbonizing carbon precursor is thereby increased. |
