Mei Tingwei, Zhu Mingtao, Zhang Hongjian, Zhang Yong
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Center for Smart Materials and Device Integration, Wuhan University of Technology, Wuhan 430070, China.
Polymers (Basel). 2025 May 27;17(11):1486. doi: 10.3390/polym17111486.
In recent years, dielectric films with a high energy-storage capacity have attracted significant attention due to their wide applications in the fields of renewable energy, electronic devices, and power systems. Their fundamental principle relies on the polarization and depolarization processes of dielectric materials under external electric fields to store and release electrical energy, featuring a high power density and high charge-discharge efficiency. In this study, sodium bismuth titanate (NBT) micro-flakes synthesized via a molten salt method were treated with hydrogen peroxide and subsequently blended with a polyvinylidene fluoride (PVDF) matrix. An oriented tape-casting process was utilized to fabricate a dielectric thin film with enhanced energy storage capacity under a weakened electric field. Experimental results demonstrated that the introduction of modified NBT micro-flakes facilitated the interfacial interactions between the ceramic fillers and polymer matrix. Additionally, chemical interactions between surface hydroxyl groups and fluorine atoms within PVDF promoted the phase transition from the α to the β phase. Consequently, the energy storage density of PVDF-NBT composite increased from 2.8 J cm to 6.1 J cm, representing a 110% enhancement. This design strategy provides novel insights for material innovation and interfacial engineering, showcasing promising potential for next-generation power systems.
近年来，具有高储能容量的介电薄膜因其在可再生能源、电子设备和电力系统等领域的广泛应用而备受关注。其基本原理依赖于介电材料在外部电场作用下的极化和去极化过程来存储和释放电能，具有高功率密度和高充放电效率。在本研究中，通过熔盐法合成的钛酸铋钠（NBT）微片用过氧化氢处理，随后与聚偏氟乙烯（PVDF）基体共混。采用定向流延工艺制备了在弱电场下储能容量增强的介电薄膜。实验结果表明，改性NBT微片的引入促进了陶瓷填料与聚合物基体之间的界面相互作用。此外，PVDF中表面羟基与氟原子之间的化学相互作用促进了从α相到β相的相变。因此，PVDF-NBT复合材料的储能密度从2.8 J/cm提高到6.1 J/cm，提高了110%。这种设计策略为材料创新和界面工程提供了新的见解，展示了下一代电力系统的广阔潜力。
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