Piezoelectric KNN ceramic for energy harvesting from mechanochemically activated precursors
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In this study, a high quality Na0.52K0.435Li0.045Nb0.905Ta0.05Sb0.045O3 (LS45-H) ceramic has been prepared from mechanochemically activated LS45 powder and normal sintering in air, which is promising for use in lead-free piezoelectric energy harvester. Herein, the LS45-H ceramic not only has less defect structure, but also has a more uniform and denser microstructure. Furthermore, the LS45-H ceramic exhibits excellent energy harvesting performance in the mode of cantilever-type structure, and a high output power of 11.5 µW and output voltage of 5 V were obtained at the acceleration of 10 m/s2. This work provides a simple method for preparing dense, uniform KNN ceramics without abnormal grain growth, and we believed that the LS45-H ceramic has a potential application in piezoelectric energy harvester for self-powered sources of wireless sensor network systems.
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51602012, 51677001), Ri-Xin Talents Project of Beijing University of Technology (Grant No. 2017-RX(1)-15), Jing-Hua Talents Project of Beijing University of Technology (Grant No. 2015-JH-L04) and Beijing Municipal High Level Innovative Team Building Program (No. IDHT20170502).