The poor elasticity of piezoelectric nanogenerator(PENG)assembled based on piezoelectric ceramics and piezoelectric polymers limits its application in wearable devices and implantable devices.Therefore

styrene-isoprene-styrene(SIS)/barium titanate(BTO)composite elastic PENG based on the superelastic material SIS block copolymer and gallium indium alloy liquid metal stretchable electrodes are prepared

which exhibit excellent adhesion and high-voltage output characteristics.The research results indicate that when the BTO doping mass fraction is 20wt%

the SIS/BTO composite elastic PENG has the optimal output performance

with an output voltage of 9.62V and a current of 657nA

which are 2 times and 2.8 times higher than the pure SIS elastic PENG

respectively

and an output power of 2.25μW.The elongation at break is as high as 1276%.And after 5000 cycles of impact testing

the output voltage of SIS/BTO composite elastic PENG does not significantly decrease

and the output performance of the composite elastic PENG is stable.Meanwhile

by attaching SIS/BTO composite elastic PENG to the joints of the human body

real-time monitoring of joint bending can be achieved.This indicates that the SIS/BTO composite elastic PENG has good elasticity and biocompatibility

and is expected to be widely used in implantable and wearable electronic devices.