Current Collector-Free Interdigitated Nb₂O₅//LiFePO₄ Micro-Batteries Prepared by a Simple Laser-Writing Process

The recent development of the internet things (IoT) raises new needs in energy storage micro-devices to power implantable and wearable applications. Conventional battery components, including electrode materials current collectors, have be miniaturized integrated onto flexible substrates while keeping their electrochemical performance. Although numerous micro-fabrication processes were successfully adapted prepare lithium-ion micro-batteries (Li-ion μ Bs), they often rely on wet processing routes such as deposition, which does not allow preparation micro-sources at a large scale. Laser-writing are among most practical versatile methods deposit active thin films substrates. Here, we report about integration positive LiFePO 4 (LFP)-based negative pseudocapacitive niobium pentoxide (Nb 2 O 5 )-based electrodes collector-free polyimide foils, through laser-writing mixture HAuCl , cellulose acetate, material coated polyimide. influence laser during step performance as-prepared was studied. Laser-scribed (LS) Nb exhibit typical behavior, deliver up 114 Ah.cm −2 (205 mF.cm ), 76 recorded for LS-LiFePO prepared with optimized parameters. //LiFePO assembled parallel-plate configuration, providing 32 areal capacity, despite absence any underlying collectors. Finally, interdigitated planar realized by this simple procedure, thus paving path towards facile fabrication