Lattice spacing (d002): 0.333-0.350 nm Crystallite size in a-axis direction, La: 20 nm or more Crystallite size in c-axis direction, Lc: 20 nm or more True density: 2.00 to 2.25 g/cm3 It is also possible to modify a graphite by adding thereto a metal oxide such as tin oxide or silicon oxide, phosphorus, boron, amorphous carbon, or the like.