Zhang Leiyang, Jing Ruiyi, Huang Yunyao, Yang Yule, Li Yang, Tang Mingyang, Cao Shuyao, Chen Zibin, Gao Feng, Du Yuxiao, Zhou Shiyu, Zhao Jianwei, Liu Shiyu, Wang Dawei, Zhang Shujun, Jin Li
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
College of Physics and Electronic Information, Yan'an University, Yan'an, 716000, China.
Adv Mater. 2024 Oct;36(41):e2406219. doi: 10.1002/adma.202406219. Epub 2024 Aug 12.
In pulse power systems, multilayer ceramic capacitors (MLCCs) encounter significant challenges due to the heightened loading electric field (E), which can lead to fatigue damage and ultrasonic concussion caused by electrostrictive strain. To address these issues, an innovative strategy focused on achieving an ultra-weak polarization-strain coupling effect is proposed, which effectively reduces strain in MLCCs. Remarkably, an ultra-low electrostrictive coefficient (Q) of 0.012 m C is achieved in the composition 0.55(BiNa)TiO-0.45Pb(MgNb)O, resulting in a significantly reduced strain of 0.118% at 330 kV cm. At the atomic scale, the local structural heterogeneity leads to an expanded and loose lattice structure, providing ample space for large ionic displacement polarization instead of lattice stretching when subjected to the applied E. This unique behavior not only promotes energy storage performance (ESP) but also accounts for the observed ultra-low Q and strain. Consequently, the MLCC device exhibits an impressive energy storage density of 14.6 J cm and an ultrahigh efficiency of 93% at 720 kV cm. Furthermore, the superior ESP of the MLCC demonstrates excellent fatigue resistance and temperature stability, making it a promising solution for practical applications. Overall, this pivotal strategy offers a cost-effective solution for state-of-the-art MLCCs with ultra-low strain-vibration in pulse power systems.
在脉冲功率系统中，多层陶瓷电容器（MLCC）由于负载电场（E）增强而面临重大挑战，这可能导致电致伸缩应变引起的疲劳损伤和超声冲击。为了解决这些问题，提出了一种旨在实现超弱极化-应变耦合效应的创新策略，该策略有效降低了MLCC中的应变。值得注意的是，在0.55（BiNa）TiO-0.45Pb（MgNb）O成分中实现了0.012 m C的超低电致伸缩系数（Q），在330 kV/cm时应变显著降低至0.118%。在原子尺度上，局部结构不均匀性导致晶格结构膨胀和松散，在施加电场E时，为大离子位移极化提供了充足的空间，而不是晶格拉伸。这种独特的行为不仅提高了储能性能（ESP），还解释了观察到的超低Q和应变。因此，MLCC器件在720 kV/cm时表现出令人印象深刻的14.6 J/cm的储能密度和93%的超高效率。此外，MLCC优异的ESP表现出出色的抗疲劳性和温度稳定性，使其成为实际应用的有前途的解决方案。总体而言，这一关键策略为脉冲功率系统中具有超低应变-振动的先进MLCC提供了一种经济高效的解决方案。
