COMPRESSIBLE FIBROUS ELECTRET STRUCTURE AND ELECTROSTATIC TRANSDUCER FOR KINETIC ENERGY HARVESTING

• Main Authors: BASSET, Philippe, LEPRINCE-WANG, Yamin, LU, Yingxian
• Format: Patent
• Language: English; French; German
• Published: 06.06.2018
• Subjects: BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION

The present invention relates to a compressible porous fibrous electret film, for use as an electrical film in an electrostatic transducer. Said compressible porous fibrous electret film comprises: - a layer of tangled micro/nanofibers , - said layer of tangled micro/nanofibers being coated with a dielectric conformal coating , - said conformal coating conforming the shape of the tangled micro/nanofibers, said coating being adapted to store electrical charges and to be permanently charged with a quantity of electrical charges, whereby the dielectric conformal coating increases the quantity of electrical charges of the electret film by increasing a storage's surface of the electrical charges and the coated tangled micro/nanofibers define pores within the film. Upon applying a mechanical force (such as by shearing, compressing, and/or stretching) on the electrostatic transducer, electricity is generated. The electrostatic transducer of the invention is thus useful for harvesting kinetic energy or mechanical sensing.