Recently, McLarnon et al. [ 1,2] have addressed the status
of research and development of both primary and secondary
alkaline zinc batteries. In general, either zinc or its alloys are
used as anodes in these batteries. The purity of the zinc is
very high, i.e., of the order of 99.9 wt.% or more. In some
cells, zinc is alloyed with cadmium, mercury, lead, etc. Of
these alloying elements, cadmium and mercury are highly
undesirable from the point of view of pollution. In particular,
the presence of mercury in alkaline Zn-MnO2 dry cells is
considered to be a potential source of pollution, since the
production of alkaline MnO2 cells is continuously increasing.
Most probably, the traditional Leclanch6 system may be
abandoned completely, since the alkaline system possesses
much better electrochemical characteristics. Hence, the
development of zinc or zinc-based alloys as anodes for alkaline
power sources has become a necessity and, in this connection,
development of mercury-free zinc assumes great
importance. Similarly, Zn-air battery technology also
requires mercury-free zinc anodes.
Recently, McLarnon et al. [ 1,2] have addressed the statusof research and development of both primary and secondaryalkaline zinc batteries. In general, either zinc or its alloys areused as anodes in these batteries. The purity of the zinc isvery high, i.e., of the order of 99.9 wt.% or more. In somecells, zinc is alloyed with cadmium, mercury, lead, etc. Ofthese alloying elements, cadmium and mercury are highlyundesirable from the point of view of pollution. In particular,the presence of mercury in alkaline Zn-MnO2 dry cells isconsidered to be a potential source of pollution, since theproduction of alkaline MnO2 cells is continuously increasing.Most probably, the traditional Leclanch6 system may beabandoned completely, since the alkaline system possessesmuch better electrochemical characteristics. Hence, thedevelopment of zinc or zinc-based alloys as anodes for alkalinepower sources has become a necessity and, in this connection,development of mercury-free zinc assumes greatimportance. Similarly, Zn-air battery technology alsorequires mercury-free zinc anodes.
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