A type of secondary cell in which layered electrodes,
usually made of metal oxides or graphite, store positive
ions between crystal layers of an electrode.
one type, lithium ions form an intercalation compound
with a graphite electrode when the cell is charged.
During discharge, the ions move through an electrolyte
to the other electrode, made of manganese oxide, where
they are more tightly bound.
When the cell is being
charged, the ions move back to their positions in
the graphite. This backwards and forwards motion of
the ions has led to the name rocking-chair cell for
this type of system.
Such cells have the advantage
that only minor physical changes occur to the electrodes
during the charging and discharging processes and
the electrolyte is not decomposed but simply serves
as a conductor of ions.