2016 年 124 巻 9 号 p. 963-966
Li2FeSiO4 nanoparticles/carbon composite powders were synthesized using spray pyrolysis (SP), followed by heat treatment and grinding. Glucose, added to the precursor solution for SP, was used as the carbon source. Both Li2FeSiO4 nanoparticles and carbon were formed simultaneously during SP. The primary particle size of the Li2FeSiO4 powder obtained from this process was smaller than 20 nm. Graphitic carbon formation was inferred based on results obtained from FT-IR and Raman spectra. The Li2FeSiO4 crystallite size decreased concomitantly with increasing carbon concentration. The composite powder exhibited excellent discharge capacity of 250 mAh·g−1 and excellent cycle performance. Results show that the carbon produced by glucose improves electric conductivity and discharge capacity by suppressing Li2FeSiO4 grain growth.
