Ultrasonic driven wireless charging technology has recently gained increasing attention. High-performance potassium sodium niobate [(K, Na)NbO₃, KNN] based ceramics and its potential application on energy harvesting device are presented in this work. A series of lead-free 0.964(K_0.48Na_0.52)Nb_0.96Sb_0.04O₃-0.032(Bi_0.5Na_0.5)ZrO₃-xBiFe_0.9Co_0.1O₃ [KNNS-BNZ-xBFC] piezo-ceramics are first designed and prepared to search for good piezoelectric properties, high Curie temperature and good thermal stability. Through content tailoring, the KNNS-BNZ-0.004BFC ceramic presents enhanced piezoelectric properties via the construction of rhombohedral-tetragonal phase boundary near room temperature. Based on the synthesized ceramics, a high-output flexible ultrasound-based wireless energy harvesting device is further designed and manufactured to establish a connection among ceramics and practical application in lead-free KNN-based ceramics. The average ultrasound receiving sensitivity of the fabricated device is calculated to be ~ 1.5 Vpp·MPa⁻¹, demonstrating the superior performances. An instantaneous power density of 52.07 mW/cm² has been obtained from the incident ultrasound pressure of 1.90 MPa. Capacitor charging applications and the feasibility study of ex vivo characterizations under porcine tissue also demonstrate the good application prospect of the harvester. The above results exhibit great potential of the environmentally friendly KNN-based materials to be integrated in the implantable device for safe biomedical applications.

超声波驱动的无线充电技术最近越来越受到关注。本文介绍了高性能铌酸钾钠[（K，Na）NbO ₃，KNN]基陶瓷及其在能量收集装置中的潜在应用。一系列无铅0.964（K _0.48 Na _0.52）Nb _0.96 Sb _0.04 O ₃ -0.032（Bi _0.5 Na _0.5）ZrO ₃ - x BiFe _0.9 Co _0.1 O ₃ [KNNS-BNZ- x[BFC]压电陶瓷首先被设计和制造，以寻求良好的压电特性，居里温度高和良好的热稳定性。通过内容量身定制，KNNS-BNZ-0.004BFC陶瓷通过在室温附近构建菱形-四边形相界来增强压电性能。在合成陶瓷的基础上，进一步设计制造了高输出的基于柔性超声的无线能量采集装置，以建立陶瓷之间的连接并在无铅KNN基陶瓷中实际应用。所制造的装置的平均超声接收灵敏度经计算为〜1.5Vpp·MPa ^-1，证明了优异的性能。瞬时功率密度为52.07 mW / cm ²从1.90 MPa的入射超声压力获得。电容器充电的应用以及猪组织下离体表征的可行性研究也证明了收割机的良好应用前景。上述结果显示出将环保的基于KNN的材料集成到可植入设备中以实现安全生物医学应用的巨大潜力。