a 2 u03b8 of 42 to 44 u00b0 more specifically the half value width of the relatively broad peak at a 2 u03b8 of 40 to 50 u00b0 peak top is at a 2 u03b8 of 44 u00b0 was 4 60 and the height of the peak was 24 cps the half value width of the sharp peak at a 2 u03b8 of 42 to 44 u00b0 peak top is at a 2 u03b8 of 42 9 u00b0 was 0 36 u00b0 and the height of the peak was 46 cps the ratio of the intensity of the sharp peak to the intensity of the broad peak was 1 92 the negative electrode carbon materials for lithium ion secondary batteries of examples 2 3 10 and 12 each had a relatively broad peak at a 2 u03b8 of 40 to 50 u00b0 and a sharp peak at a 2 u03b8 of 42 to 44 u00b0 like example 1 however the negative electrode carbon materials for lithium ion secondary batteries of examples 4 to 9 11 and 13 each had a relatively broad peak at a 2 u03b8 of 40 to 50 u00b0 but the half value width of a peak at a 2 u03b8 of 42 to 44 u00b0 was less than 0 30 u00b0 and the a b ratio of the intensity a of this peak to the intensity b of the broad peak was less than 1 2 therefore it could not be distinguished from noise table 2 an x ray diffraction diagram of the negative electrode carbon material of example 8 is shown in fig2 in table 1 the negative electrode carbon material for a lithium ion secondary battery of example 7 which was post calcinated at 2.