Design of a Self-Powered System by Wind-Driven Triboelectric Nanogenerator Based on 0.94(Bi 0.5 Na 0.5 )TiO 3 -0.06Ba(Zr 0.25 Ti 0.75 )O 3 /Polyvinylidene Fluoride (BNT-BZT/PVDF) Composites.

The portable power bank as an energy storage device has received tremendous attention while the limited capacity and periodical charging are critical issues. Here, a self-charging power system (SCPS) consisting of a 0.94(Bi 0.5 Na 0.5 )TiO 3 -0.06Ba(Zr 0.25 Ti 0.75 )O 3 /polyvinylidenefluoride (BNT-BZT/PVDF) composite film-based triboelectric nanogenerator (TENG) is designed as a wind energy harvester and an all-solid-state lithium-ion battery (ASSLIB) as the energy storage device. The optimized TENG can provide an output voltage of ≈400 V, a current of ≈45 µA, and a maximum power of ≈10.65 mW, respectively. The ASSLIB assembled by LiNiCoMnO 2 as the cathode, NiCo 2 S 4 as the anode, and Li 7 La 3 Zr 2 O 12 as the solid electrolyte can maintain a discharge capacity of 51.3 µAh after 200 cycles with a Coulombic efficiency of 98.5%. Particularly, an ASSLIB can be easily charged up to 3.8 V in 58 min using the wind-driven TENG, which can continuously drive 12 parallel-connected white light-emitting diodes (LEDs) or a pH meter. This work demonstrates the development of low-cost, high-performance and high-safety SCPSs and their large-scale practical application in self-powered microelectronic devices.