HIGH-SURFACE-AREA, LOW-WEIGHT COMPOSITE NICKEL FIBER ELECTRODES

[摘要] The energy density and power density of lightweight aerospace batteries utilizing the nickel oxide electrode are often limited by the microstructures of both the collector and the resulting active deposit inion the collector. Heretofore, these two microstructures have been intimately linked to one another by the materials used to prepare the collector grid as well as the methods and conditions used to deposit the active material. Significant weight and performance advantages have been demonstrated by Britton and Reid at NASA-LeRC using FIBREX nickel mats of similar to 28-32 mu m diameter. Work in our laboratory has investigated the potential performance advantages offered by nickel fiber composite electrodes containing a mixture of fibers as small as 2 mu m diameter (available from Memtec America Corporation). These electrode collectors possess in excess of an order of magnitude more surface area per gram of collector than FIBREX nickel. The increase in surface area of the collector roughly translates into an order of magnitude thinner layer of active material. Performance data and advantages of these thin layer structures will be presented. Attributes and limitations of their electrode microstructure to independently control void volume, pore structure of the NI(OH)(2) deposition, and resulting electrical properties will be discussed.

[发布日期] 1994-01-15

[效力级别]  Proceedings Paper