SECONDARY BATTERY, AND GRAPHITE MATERIAL FOR SECONDARY BATTERY

PROBLEM TO BE SOLVED: To obtain a lithium ion secondary battery having high capacity and high reliability by suppressing deterioration of the inside of the battery caused by exposure to thermal history.SOLUTION: A ratio RG (=Gs/Gb) of graphitization degree Gs determined from surface-enhanced Raman spectral spectrum to graphitization degree Gb determined from Raman spectral spectrum using argon laser light, which are structural parameters of carbon material, is prescribed to 4.5 or higher, and a nonaqueous electrolyte secondary battery is constituted by using the carbon material having the RG as a negative electrode. In the surface-enhanced Raman spectral spectrum using the argon laser light, the nonaqueous electrolyte secondary battery is constituted by using material having a peak in a range of 1360 cmor more as the negative electrode.