What types of rechargeable batteries (secondary batteries) are there and where are they used?

There are a variety of rechargeable batteries or secondary batteries, which can be roughly divided into liquid electrolyte batteries (also called wet cell) and solid-state batteries. Generally, they consist of 2 electrodes and an electrolyte, each of which can be made of different materials.

The majority of batteries in use today and in the near future are liquid electrolyte batteries, mainly lithium ion batteries.

Some solid-state batteries are already in use, most others are currently in basic research. Materials used are, for example, sodium, magnesium or aluminium.