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Wearable electronic devices and gadgets raise the need for flexible, thin andlightweight batteries. In this article we present for the first time, a unique,single-step method for the preparation of a membrane-electrode assembly forflexible-batteries application. Concurrent electrophoretic deposition (EPD) ofpositive and negative battery electrodes (LFP and LTO) on opposite sides of acommercial nanoporous membrane (Celgard 2325) results in the formation of athree-layer-battery structure. The cell comprising this electrophoreticallydeposited structure ran for more than 150 cycles with 125-140mAh/g capacity,which approaches the theoretical value of lithium iron phosphate. Theelectrodes can be deposited either cathodically or anodically by replacing theinterchangeable charging agents, like polyethyleneimine and polyacrylic acid.These polyelectrolytes, when adsorbed on the particles of the active material,serve also as the binders. The simultaneous EPD, which we developed, can beused for the simple and low-cost manufacturing of a variety of cathode andanode materials on nanoporous polymer- and ceramic ion-conducting membranes forenergy storage devices.

Novel one-step electrophoretic deposition of membrane-electrode assembly for flexible-batteries application