| 摘要 |
PURPOSE:To increase the initial performance and the life performance of a lead acid battery by using a positive plate which is prepared by adding a compound produced between graphite layers to a positive active material so as to make the porosity of the positive active material to be increased. CONSTITUTION:Lead powder is added with 0.01-5.0% of a compound that is produced between graphite layers, before the mixture is well mixed and a paste having a density of about 4.6g/cm<2> is prepared from the mixture by a well known method. Following that, thus prepared paste is packed into a grid made of a lead alloy, before the grid packed with the paste is matured and is subjected to formation, thereby a positive plate being obtained. The above compound produced between graphite layers is prepared by subjecting natural graphite to heat treatment at 2,000 deg.C so as to make it to have large anisotropy, and treating it in a concentrated sulfuric acid. |
