Transport in porous fibrous networks: Simulations and experiments in NiMH batteries.

Abstract

This research represents a continuation of a project to assess the suitability of the microstructures for use in nickel-metal hydride batteries. This technology shows great promise in automotive applications, and has already found wide use in small consumer electronics, including laptop computers. Novel anodes in these cells, constructed from substrates of highly porous, sinter-bonded networks of nickel-coated, fine-gauge carbon or polymer fibers, have greatly reduced cell weights, and thus have increased battery efficiency. These fibrous substrates are impregnated with an active material, which is consumed and replenished during the electrochemical reaction in the cell. This project addressed to optimize the geometry contents of fiber material to decrease electrode size and weight while increasing performance. A systematical study on battery cycling, resistance measurement, tension testing and image analysis was as well performed to obtain a better understanding of the behavior of NiMH electrodes under electrochemical cycling conditions.