Introduction -- General Cconcepts -- Thermal energy storage -- Reversible chemical reactions -- Energy storage in organic fuels -- Mechanical energy storage -- Electromagnetic energy storage -- Hydrogen storage -- Introduction to electrochemical energy storage -- Principles determining the voltages and capacities of electrochemical cells -- Binary electrodes under equilibrium or near-equilibrium conditions -- Ternary electrodes under equilibrium or near-equilibrium conditions -- Potentials -- Insertion reaction electrodes -- Electrode reactions that deviate from complete equilibrium -- Primary, non-rechargeable batteries -- Lead-acid batteries -- negative ectrodes in other rechargeable aqueous systems -- Positive electrodes in other aqueous systems -- Positive electrodes in lithium systems -- Energy storage for medium-to-large scale applications -- Storage of energy for vehicle propulsion -- A look to the future