NOVELTY - The electrochemical cell comprises a negative electrode (202) including a first form of lithium, a positive electrode (204) spaced apart from the negative electrode, a separator (206) positioned between the negative and positive electrodes, an active material (220) located in the positive electrode including a second form of lithium, a gas neutralizing additive located within an electrolyte (214) in the positive electrode, the negative electrode and the separator, and a compartment (230) in fluid communication with the negative electrode, the separator and the positive electrode.    USE - The electrochemical cell such as rechargeable lithium-ion battery is useful as attractive energy storage systems for portable electronics and electric and hybrid-electric vehicles.    ADVANTAGE - The electrochemical cell has high energy storage capacity, improved rechargeability and long service life, and exhibits reduced reliance on external circuits thus preventing the overcharge or over-discharge of the lithium-ion battery.    DETAILED DESCRIPTION - The electrochemical cell comprises a negative electrode (202) including a first form of lithium, a positive electrode (204) spaced apart from the negative electrode, a separator (206) positioned between the negative and positive electrodes, an active material (220) located in the positive electrode including a second form of lithium, a gas neutralizing additive located within an electrolyte (214) in the positive electrode, the negative electrode and the separator, and a compartment (230) in fluid communication with the negative electrode, the separator and the positive electrode. The gas neutralizing additive is located within the compartment, and comprises a material from an electron withdrawing group and a unit for catalyzing the reduction of nitrogen to ammonia.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of an electrochemical cell.    Negative electrode (202)    Positive electrode (204)    Separator (206)    Electrolyte (214)    Active material (220)    Compartment. (230)