| 摘要 |
PURPOSE:To control a rise of the inner impedance in storing at a high temperature, and to improve the preservation property, by adding lithium fluoride in a cell. CONSTITUTION:A cell 1 made of a stainless steel has a sealing plate 2 of the same material, and lithium 3 as a negative active substance is attached to the sealing plate 2. A positive electrode collector 4 made of titanium is spot- welded to the inner surface of the case 1. A positive electrode black mix 5 is made by molding the mixture of carbon fluoride as an active substance, acetylene black, and a fluorine resin binder into pellets. As the electrolyte, is used a solution made by resolving lithium boron-fluolide in a mixture of the same amounts of propylene carbonate and 1, 2-dimethoxyethane. Fluorine ions separated from the lithium fluoride added to the negative active substance, lithium, form a protective membrane over the surface of the lithium which is the negative active substance. This membrane prevents the reaction of impurities, peroxide representatively, and the lithium, keeps the activity over the lithium surface, and controls a rise of the inner resistance in storing at a high temperature, resulting in a good preservation property. |
