Improvement of the Specific Power of Paste-Type Positive Electrodes for Ni-MH Batteries
Shinya MORISHITA*, Yasuhito KONDO and Shin-ichi TOWATA
Toyota Central Research and Development Laboratories, Inc.; 41-1 Yokomichi, Nagakute, Aichi 480-1192 Japan
In order to raise the specific power of paste-type positive electrodes for Ni-MH batteries, the relationship between the characteristics of positive electrodes and particle-diameter of the active material (nickel hydroxide) was investigated by using different particle size of active materials synthesized by the reactive recrystallization method. The specific power of paste-type positive electrodes was improved about three times higher than that of conventional ones by optimizing the diameter of the active material. The specific power of the developed paste-type positive electrodes was almost equivalent to that of sinter-type positive electrodes. The discharge capacity of the developed paste-type positive electrodes was about 20% larger than that of sinter-type positive electrodes.