| 摘要 |
PURPOSE:To provide a secondary battery large in charging capacity and volume energy density by constituting a negative electrode out of carbonic powder having specified true density and a face interval of 002 face and being made by pulverizing specified high density isotropic graphite molded item. CONSTITUTION:An nonaqueous electrolytic secondary battery is equipped with a positive electrode 1 including lithium, a negative electrode 2 consisting of carbonic material, and a nonaqueous lithium ion conductive electrolyte. The negative electrode 2 is carbonic powder being made by pulverizing high-density isotropic graphite molded item being obtained with, mainly, two ingredients of an aggregate such as coke grains, etc., and a binder such as coal tar pitch, etc., as start-up materials. This graphite molded item is made so that the anisotropic factors of Bacon may be 1.0-1.1, and the carbonic powder is made so that the true density may be 1.8g/cm<3> or over, and that the face interval of 002 face being sought by X-ray wide-angle diffraction method may be 3.4Angstrom or less. For lithium ions, the doping or dedoping from each direction becomes possible, and the capacity increases, too. |
