| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative electrode material for a nonaqueous secondary battery increasing capacity and having an excellent cycle characteristic in a negative electrode containing silicon as an active material. SOLUTION: This battery uses the negative electrode material which is composed of silicon and conductive carbon, and does not substantially include SiC, and in which the peak intensities of 770 and 940 cm<-1> belonging to SiC in Raman spectroscopy are less than 0.01 of the peak intensity of 525 cm<-1> belonging to Si. Alternatively, the battery uses the negative electrode material in which the signal having g-value of 2.0038 belonging to Li intercalated into graphite does not appear in electron spin resonance analysis at room temperature under the charged condition. |
