Carbon material for nonaqueous secondary battery, negative electrode using carbon material and nonaqueous secondary battery

摘要

This invention aims to provide a carbon material for a nonaqueous secondary battery having a high capacity and excellent charging/discharging load characteristics, which is used as a negative electrode material for a nonaqueous secondary battery. This invention relates to a carbon material for a nonaqueous secondary battery, which has a specific (1) Raman R value, (2) N atom concentration/C atom concentration ratio, and (3) S atom concentration/C atom concentration ratio.

主权项

1. A carbon material for a nonaqueous secondary battery, which satisfies the following conditions (1) to (3):
(1) the Raman R value represented by the following formula 1 is from 0.01 to 1:
Raman R value=Intensity IB of peak PB at 1360 cm−1 in Raman spectrum analysis/Intensity IA of peak PA at 1580 cm−1 in Raman spectrum analysis; (2) the N/C represented by the following formula 2 is from 0.05% to 2%:
N/C (%)=[N atom concentration calculated based on peak area of N1s spectrum in X-ray photoelectron spectroscopy analysis/C atom concentration calculated based on peak area of C1s spectrum in X-ray photoelectron spectroscopy analysis]×100; and (3) the S/C represented by the following formula 3 is from 0.05% to 2%:
S/C (%)=[S atom concentration calculated based on peak area of S2s spectrum in X-ray photoelectron spectroscopy analysis/C atom concentration calculated based on peak area of C1s spectrum in X-ray photoelectron spectroscopy analysis]×100.