BATTERY CELL

摘要

A battery cell including: an anode configured to operate as a source of cations during discharge of the battery cell; and an electrolyte configured to transport the cations from the anode to the a cathode during discharge of the battery cell, wherein the cathode comprises material that is configured to enable the reversible insertion of transported cations during discharge of the battery cell and that has optical properties that are dependent upon cation insertion and that is viewable by a user.