Anatomy of a
Most batteries contain three basic parts: electrodes, an electrolyte and a separator, according to Ann Marie Sastry, co-founder and CEO of Sakti3, a Michigan-based battery technology startup.
There are two electrodes in every battery. Both are made of conductive materials, but they serve different roles. One electrode, known as the cathode, connects to the positive end of the battery and is where the electrical current leaves (or electrons enter) the battery during discharge, which is when the battery is being used to power something. The other electrode, known as the anode, connects to the negative end of the battery and is where the electrical current enters (or electrons leave) the battery during discharge.
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