A flexible piezoelectric polymer micromechanical energy harvester and its preparation method

Abstract

The invention discloses a flexible piezoelectric polymer micromechanical energy collector and a preparation method thereof. In the invention, the parallel multi-layer piezoelectric films are wound on the side wall of the polymer elastic body along the length direction, and the parallel electrodes are led out by wires; Due to the curvature of the upper and lower surfaces, the force along the axial direction is amplified and transformed into a stress along the radial direction through the flexural tension mechanism, which is applied to the multilayer piezoelectric film to increase the stress applied to the piezoelectric film; The film converts the stress into electrical energy through the piezoelectric effect; the invention adopts the parallel structure of the multilayer piezoelectric film, so that the capacitance is increased, the internal impedance is reduced, and the effective piezoelectric response is enhanced, thereby increasing the output current and Power density; the invention has a good application prospect in the field of micro-energy.

Description

technical field [0001] The invention relates to flexible piezoelectric device technology, in particular to a flexible piezoelectric polymer micromechanical energy collector and a preparation method thereof. Background technique [0002] Harvesting energy from natural sources such as mechanical vibration, motion, force, light, heat, and magnetic field and self-powering sensors in smart wearables and wireless sensor networks has become a current research hotspot. To harvest energy from mechanical vibration and motion, typical approaches employ mechanisms such as piezoelectric, electrostatic, and electromagnetic. However, in self-powered and self-sensing wearable devices and sensor networks, piezoelectric energy harvesters show more advantages, such as simple structure, miniaturization, and high energy density. In the family of piezoelectric materials, piezoelectric ceramic materials PZT, piezoelectric single crystal PMN-PZT, etc., are widely used in various piezoelectric devi...

AI Technical Summary

Problems solved by technology

However, their piezoelectric properties are still poor relative to inorganic piezoceramics or single crystals

Many reports have attempted to improve the piezoelectric properties of PVDF through material doping and various process treatments, but with little success.

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