| 摘要 |
PURPOSE:To prevent an active material from falling off by constituting in such a way that the active material has a crystalline graphite structure and also contains hollow carbon fiber as an additive. CONSTITUTION:Cut fiber, sulfuric acid and water are added to lead powder so as to be kneaded together, and carbon fiber, which has the diameter of 0.1-0.3mum, the length of less than 7mum and a graphite structure of the hollow diameter of 0.03-0.14mum, is added to obtained paste to be agitated so that it can be 0.4wt.% to the lead powder, and then water content is adjusted to be 13wt.% so as to form positive electrode paste. Meanwhile, two current collecting bodies consisting respectively of Pb-Ca-Sn alloy are arranged in parallel on a plastic film substrate to be adhered by means of pressure so as to form the current collecting bodies for a positive electrode and negative electrode. In this way, by forming the positive electrode paste by adding the carbon fiber having a crystalline graphite structure and a hollow structure to lead paste to be mixed, even if the graphite structure of the carbon fiber forms a compound between graphite layers, an active material never falls off because of the hollow structure. |
