Li Chenyi, Liu Yang, Li Bo, Yuan Ze, Yang Tiannan, Liu Yuquan, Gao Hanxiao, Xu Linxiao, Yu Xiang, Luo Quan, Tang Shengfei, Yao Minghai, Gong Yutie, Fei Zekai, Chen Long-Qing, Zhang Haibo, Zhou Huamin, Wang Qing
State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, China.
Guangdong Huazhong University of Science and Technology Industrial Technology Research Institute, Guangdong Provincial Key Laboratory of Manufacturing Equipment Digitization, Dongguan, China.
Nat Mater. 2025 Apr 9. doi: 10.1038/s41563-025-02211-z.
Relaxor ferroelectrics have been intensively studied during the past two decades for capacitive energy storage in modern electronics and electrical power systems. However, the energy density of relaxor ferroelectrics is fundamentally limited by early polarization saturation and largely reduced polarization despite high dielectric constants. To overcome this challenge, here we report the formation of a high-entropy superparaelectric phase in relaxor ferroelectric polymers induced by low-dose proton irradiation, which exhibits delayed polarization saturation, reduced ferroelectric loss and markedly improved polarizability. Our combined theoretical and experimental results reveal that new chemical bonds generated by the irradiation-induced chemical reactions are essential to the formation of the high-entropy state in ferroelectric polymers. The high-entropy superparaelectric phase endows the polymer with a substantially enhanced intrinsic energy density of 45.7 J cm at room temperature, outperforming the current ferroelectric polymers and nanocomposites under the same electric field. Our work widens the high-entropy concept in ferroelectrics and lays the foundation for the future exploration of high-performance ferroelectric polymers.
在过去二十年中，弛豫铁电体因其在现代电子和电力系统中的电容储能特性而受到广泛研究。然而，尽管弛豫铁电体具有高介电常数，但其能量密度却受到早期极化饱和的根本限制，并且极化大幅降低。为了克服这一挑战，我们在此报告通过低剂量质子辐照在弛豫铁电聚合物中形成了一种高熵超顺电相，该相表现出延迟的极化饱和、降低的铁电损耗以及显著提高的极化率。我们的理论与实验相结合的结果表明，辐照诱导化学反应产生的新化学键对于铁电聚合物中高熵态的形成至关重要。高熵超顺电相赋予聚合物在室温下高达45.7 J/cm³的本征能量密度，在相同电场下性能优于当前的铁电聚合物和纳米复合材料。我们的工作拓宽了铁电体中的高熵概念，为未来高性能铁电聚合物的探索奠定了基础。
