Abstract
The coming era of the Internet of Things urgently demands self-charging power systems with the ability of low-power energy harvesting and energy storage. In this work, we design BaTiO3 with different morphologies (nanoparticles, nanoplates, and nanowires) to be filled in the P(VDF-HFP) composite. The introduction of NaCl crystal as a template can increase the porosity of the polymer film. A series of flexible self-charging sodium-ion batteries have been assembled using the porous BaTiO3-P(VDF-HFP)-NaClO4 film as a piezo-electrolyte. Among those piezo-electrolytes with different morphologies BaTiO3 filler, self-charging sodium-ion batteries (Na0.71Co0.96O2||Na) with BaTiO3 nanoplates-P(VDF-HFP) - NaClO4 as electrolyte exhibit superior self-charging performance with the increased capacity of 1.132 mAh in 100 h under static pressure of 5 N. In addition, the flexible battery was subjected to bending pressure and tapping tests. There is little work investigating the morphology effects of filler on self-charging batteries. This work provides an optimization method for piezo-electrolyte of self-charging sodium-ion batteries.
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