What is the purpose of electrolyte in batteries?

A battery is a device for energy conversion and storage. It converts chemical or
physical energy into electrical energy through a reaction. A battery is a kind of
chemical power source. It consists of two different components of
electrochemically active electrodes, which are composed of positive and negative
electrodes. The two electrodes are immersed in an electrolyte that can provide
media conduction. When connected to an external carrier, it is converted by
Internal chemical energy to provide energy. As an electrical storage device, when
two metals (usual metals with different properties) are immersed in the electrolyte
does not necessarily conduct electricity, but only conducts ions that are free to
move when dissolved in water or molten state. The ionic compound can conduct
electricity in an aqueous solution or in a molten state; some covalent compounds
can also conduct electricity in an aqueous solution, but a solid electrolyte is also
present, the conductivity of which is derived from the migration of ions in the
crystal lattice.

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