| 摘要 |
PURPOSE:To obtain high capacity and enable large current discharge by providing active material made of alkali metal such as lithium and a support made of carbon material, and setting the atomic ratio of hydrogen to carbon less than a predetermined value and a spacing at a predetermined face obtained by an X-ray wide angle diffraction method and the size of crystallite in a C-axis direction within a specific range, respectively. CONSTITUTION:A positive electrode 2 is housed in a positive electrode can 1 serving as a positive electrode terminal in such a way as to be seated on the bottom of the can 1. A negative electrode 4 is arranged oppositely to the positive electrode 2 through a separator 3. The separator 3 for holding an electrolyte is formed with non woven fabrice made of polyolefine resin having an excellent liquid retaining property. Active material is made of lithium or alkali metal including mainly lithium. A support is made of carbon material and expanded graphite, wherein the atomic ratio of hydrogen to carbon is less than 0.10. A spacing at a (002) face obtained by an X-ray wide angle diffraction method is 3.37Angstrom or more and 3.75Angstrom or less, and crystallite in a C-axis direction is 5Angstrom or more and 150Angstrom or less in size. |
