NOVELTY - The lithium-ion electrochemical cell comprises: a metal oxide cathode (102); anode (104) comprising lithium; a separator (108) between the anode and cathode; a non-aqueous electrolyte (106) comprising non-aqueous solvents and lithium salts; and a nitrogen-containing material that is insoluble in the electrolyte. The nitrogen-containing material comprises a polyelectrolyte. Each of the cathode, anode and separator comprises the nitrogen-containing material. The nitrogen-containing material forms an ion-conductive surface layer on the anode.    USE - The lithium-ion electrochemical cell is useful in a battery (claimed) including lithium-ion battery that is useful in portable electronic devices such as cellular phones, laptop, computers, electric vehicles, and military and aerospace applications.    ADVANTAGE - The lithium-ion electrochemical cell effectively improves cycle efficiency and durability of the battery using nitrogen-containing compounds.    DETAILED DESCRIPTION - The lithium-ion electrochemical cell comprises: a metal oxide cathode (102); anode (104) comprising lithium; a separator (108) between the anode and cathode; a non-aqueous electrolyte (106) comprising non-aqueous solvents and lithium salts; and a nitrogen-containing material that is insoluble in the electrolyte. The nitrogen-containing material comprises a polyelectrolyte. Each of the cathode, the anode and the separator comprises the nitrogen-containing material. The nitrogen-containing material forms an ion-conductive surface layer on the anode. The nitrogen-containing material forms part of the anode, the cathode and/or the separator. The electrolyte comprises 85% of non-aqueous solvents, 0.5-7.5% of nitro additive, and 4% of nitrogen-containing material. The cell life is greater than 90 cycles and a discharge capacity ratio of the cell is greater than 0.8 after 60 cycles. An INDEPENDENT CLAIM is included for a battery.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an electrochemical cell.    Cathode (102)    Anode (104)    Electrolyte (106)    Separator (108)    Cathode coating. (110)