Multifunctional flexible self-supporting film electrode for wearable energy-storage sensing system

Thriving digital information technologies are propelling the elegant convergence of aesthetics and functionality in wearable electronic devices. However, developing tiny wearable systems is challenging due to the integration of bulky, cumbersome, and hazardous power supply components. To address this issue, we design a wearable energy-storage sensing system that integrates a V2O5/MXene flexible film serving as both a cathode of zinc-ion microbatteries (ZIMBs) and a piezoresistive sensor. The flexible film, free of inert binder, enhances electrode utilization for higher energy densities. Characterised by its heterostructure and interconnected porous structure, the film provides a ultra-stability (18000 cycles at 30 A g- 1 ) and excellent rate performance (167 mAh g- 1 at 50 A g-1). Beyond that, the film with high flexibility can be assembled into planar ZIMBs via vacuum filtration. The ZIMBs, capable of reliable energy output, exhibit a decent area capacity of 531.6 mu Ah cm- 2 under dynamic bending conditions. The adaptable ZIMB-sensing system integrated into the same plane offers better coupling effects. The uninterruptible power supply from microbattery ensures the system's independence, which can transmit Morse code in real time and detect body motions with a swift response time of just 84 ms. Our design principle provides new ideas for the independent and miniaturized development of wearable electronics.