Chapter 15. Batteries

Electrical batteries are assemblies of electrochemical cells in which the free energy released in a chemical reaction is transformed directly into electrical energy. They consist of electrochemical cells in which two electrodes react with an electrolyte. In primary batteries, the electrode materials are consumed in an exothermic reaction. These batteries cannot be recharged. The chemical reaction occurs in two half reactions: The anode is dissolved in the electrolyte as positive ions, leaving the electron charge in the anode. The positive ions from the electrolyte are neutralized on the cathode, which acquires a positive charge. The result is a voltage between the electrodes that stops the chemical reaction when the circuit ...

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