| 摘要 |
Provided is a method for negative electrode active material evaluation useful for steady production of batteries having a prescribed performance level. This evaluation method comprises: (A) running microscopic Raman analysis at a wavelength of 532 nm n times on a sample of a composite carbon comprising a low-crystalline carbon material at least partially on surfaces of particles of a high-crystalline carbonaceous substance (wherein n is 20 or more); (B) with respect to a Raman spectrum obtained in each microscopic Raman analysis run, determining the ratio of its D-band intensity ID to its G-band intensity IG, R (ID/IG); (C) determining the number of analysis runs, m, where the R value was 0.2 or greater, and (D) determining the ratio of m to n, the total number of analysis runs.
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