| 摘要 |
PROBLEM TO BE SOLVED: To provide a high utilization factor of an active material for a long duration by specifying the material to be used as the active material. SOLUTION: As an active material powder for this nickel electrode, a composite particle produced by coating the surface of nickel hydroxide particle with eutectic crystal of yttrium hydroxide and cobalt hydroxide is used. It is preferable that the composite particle contains 3-15wt.% of the eutectic crystal, Consequently, attributed to cobalt hydroxide in the eutectic crystal, the conductivity of the surface of the active material is improved. Moreover, the diffusion of the cobalt into the inside of the nickel hydroxide particle during charging and discharging cycles can be suppressed due to that cobalt hydroxide is formed into the eutectic crystal with yttrium hydroxide. As a result, the high and durable utilization factor is presumed to be that cobalt hydroxide can provide the surface of the active material particle with conductivity for a long duration of charging and discharging cycles. |
