| 摘要 |
PROBLEM TO BE SOLVED: To restrain the orientation of scale-like graphite, which has excellent intercalate characteristic of Li, in a negative electrode active material layer, and to improve the high rate characteristic by forming scale-like graphite powder into nearly spherical granular material, and coating a negative electrode collector foil with the active material paste, in which the granular material is distributed in the spherical shape condition, and drying it so as to obtain a negative pole plate. SOLUTION: Scale-like graphite powder 12 is supplied from a supplying machine 25 onto a disc 23 rotated at a constant speed, and the adhesive suspension liquid 14 is injected from an injector 26, and the scale-like graphite powder 12 is rolled on the inner wall 22 on a cylinder, and formed larger like a snowball, and discharged from a discharge port 28. After drying the discharged spherical material 15 with the hot air, the spherical material 15 is classified so as to obtain nearly spherical granular material. Continuously, polytetrafluoroethylene or the like is blended in this granular material, and it is kneaded so as to obtain the negative electrode active material paste, and this negative electrode active material paste is coated on a negative electrode collector foil of copper foil, and drying, rolling and cutting are performed so as to obtain a sheet-like negative pole plate. |
