Quantum Size Effect to Induce Colossal High-Temperature Energy Storage Density and Efficiency in Polymer/Inorganic Cluster Composites,Advanced Materials

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Quantum Size Effect to Induce Colossal High-Temperature Energy Storage Density and Efficiency in Polymer/Inorganic Cluster Composites
Advanced Materials ( IF 27.4 ) Pub Date : 2023-04-24 , DOI: 10.1002/adma.202301936
Mingcong Yang ₁ , Shaojie Wang ₁ , Jing Fu ₁ , Yujie Zhu ₁ , Jiajie Liang ₁ , Sang Cheng ₁ , Shixun Hu ₁ , Jun Hu ₁ , Jinliang He ₁ , Qi Li ₁

Affiliation

Polymer dielectrics need to operate at high temperatures to meet the demand of electrostatic energy storage in modern electronic and electrical systems. The polymer nanocomposite approach, an extensively proved strategy for performance improvement, encounters a bottleneck of reduced energy density and poor discharge efficiency beyond 150 °C. In this work, a polymer/metal oxide cluster composite prepared based on the “site isolation” strategy is reported. Capitalizing on the quantum size effect, the bandgap and surface defect states of the ultrasmall inorganic clusters (2.2 nm diameter) are modulated to markedly differ from regular-sized nanoparticles. Experimental results in conjunction with computational simulation demonstrate that the presence of ultrasmall inorganic clusters can introduce more abundant, deeper traps in the composite dielectric with respect to conventional polymer/nanoparticle blends. Unprecedented high-temperature capacitive performance, including colossal energy density (6.8 J cm⁻³), ultrahigh discharge efficiency (95%) and superior stability at different electric field frequencies, are achieved in these polymer/cluster composites up to 200 °C. Along with the advantages in material preparation (inexpensive precursors and one-pot synthesis), such polymer/inorganic cluster composite approach is promising for high-temperature dielectric energy storage in practical power apparatus and electronic devices.

中文翻译：

量子尺寸效应在聚合物/无机簇复合材料中引起巨大的高温储能密度和效率

聚合物电介质需要在高温下工作，以满足现代电子电气系统中静电储能的需求。聚合物纳米复合材料方法是一种经过广泛验证的性能改进策略，但在超过 150 °C 时遇到能量密度降低和放电效率差的瓶颈。在这项工作中，报道了一种基于“位点隔离”策略制备的聚合物/金属氧化物簇复合材料。利用量子尺寸效应，超小无机团簇（直径 2.2 nm）的带隙和表面缺陷态被调制为与常规尺寸纳米粒子显着不同。实验结果与计算模拟相结合表明，相对于传统的聚合物/纳米粒子共混物，超小型无机簇的存在可以在复合电介质中引入更丰富、更深的陷阱。这些聚合物/簇复合材料在高达 200 °C 的温度下实现了前所未有的高温电容性能，包括巨大的能量密度 (6.8 J cm ^{-3 )、超高放电效率 (95%) 和在不同电场频率下的卓越稳定性。}加上材料制备方面的优势（廉价的前驱体和一锅合成），这种聚合物/无机簇复合方法有望用于实际电力设备和电子设备中的高温介电储能。

更新日期：2023-04-24

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