NOVELTY - A paper based electrochemical device (5) comprises lithium-metal oxide electrode sheet (35) disposed in interference fit between at least partially electrically conductive nanomaterial infused fibrous sheet and dielectric sheet (45); second at least partially electrically conductive nanomaterial infused fibrous sheet; and second lithium-metal oxide electrode sheet (40) disposed in interference fit between second electrically conductive nanomaterial infused fibrous current collector material and dielectric sheet, where first and second electrode sheets have different compositions.    USE - As paper based electrochemical device e.g. paper-based lithium ion battery (claimed).    ADVANTAGE - The paper-based electrochemical device is flexible and rechargeable. The electrode materials and the nanomaterial-coated wood microfiber paper-based current collectors experience significantly fewer defects when subjected to repeated bending and/or flexure as compared to the conventional electrode materials deposited on conventional metal current collectors. Thus, the paper-based electrodes are well suited for flexible battery applications. The lithium ion battery is less prone to brittle fracture and failure, but still remains durable and reliable. The device does not appreciably deteriorate or lose efficiency due to bending. The cells are stable with less than 1% drop in capacity from first to 15th cycle. The process provides thicker electrode layer that reduces pinch-through shorting problem seen in some battery devices.    DETAILED DESCRIPTION - A paper based electrochemical device (5) comprises a first at least partially electrically conductive nanomaterial infused fibrous sheet; a dielectric sheet (45); a first lithium-metal oxide electrode sheet (35) disposed in an interference fit between first infused fibrous sheet and dielectric sheet; a second at least partially electrically conductive nanomaterial infused fibrous sheet; and a second lithium-metal oxide electrode sheet (40) disposed in an interference fit between the second infused fibrous current collector material and dielectric sheet, where the first and second lithium-metal oxide electrode sheets have different compositions. The lithium-metal oxide electrode sheet; or partially electrically conductive nanomaterial infused fibrous sheet is infused with an electrolyte. The device further comprises a housing positioned around the first and second fibrous sheets. INDEPENDENT CLAIMS are included for the following:    (1) an electrochemical cell comprising a first electrically conductive carbon nanotube infused paper member, a separator member, a first lithium metal-oxide member sandwiched between the first infused paper member and the separator member, and an electrolyte member dispersed in the lithium metal oxide member; and    (2) fabricating a paper lithium ion battery involving depositing a first lithium-metal oxide composition onto a first electrically conducting microfiber paper substrate to define a cathode electrode; depositing a second different lithium-metal oxide composition onto a second electrically conducting coated microfiber paper substrate to define an anode electrode, separating the cathode electrode and the anode electrode with a barrier member, infusing the cathode electrode and the anode electrode with an electrolyte, and encapsulating the anode electrode, the cathode electrode, and the barrier member in a housing to define a battery cell.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the paper based electrochemical device.    Paper based electrochemical device (5)    Flexible electrode layers (10)    Electrodes (12)    Flexible, fibrous electrically conducting current collecting substrates (15)    First lithium metal oxide cathode (35)    Second lithium metal oxide anode (40)    Dielectric sheet (45)