| 摘要 |
<P>PROBLEM TO BE SOLVED: To inexpensively provide a graphite material having a small aspect ratio of particles and suitable for an electrode active material of a rechargeable lithium-ion battery which ensures much higher initial efficiency in the first charge-discharge than a conventional material and also ensures a higher service capacity. <P>SOLUTION: A carbon material having a loss on heating of 5-20 mass% when heated from 300 to 1,000°C in an inert atmosphere, such as raw coke, is pulverized and the pulverized carbon material is graphitized to obtain the objective graphite material having a peak intensity ratio I<SB>D</SB>/I<SB>G</SB>(R value) of 0.01-0.2 and a coefficient of thermal expansion (CTE) in the range of 30-100°C being 4.0×10<SP>-6</SP>to 5.0×10<SP>-6</SP>/°C, wherein I<SB>D</SB>is a peak intensity present near 1,360 cm<SP>-1</SP>measured in a Raman spectrum and I<SB>G</SB>is a peak intensity present near 1,580 cm<SP>-1</SP>. <P>COPYRIGHT: (C)2007,JPO&INPIT |
