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.