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Basic reason for the accumulation of charge on the surface of polymer dielectrics

聚合物电介质表面电荷积聚的根本原因

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摘要

聚合物电介质在使用过程中表面会积聚大量的电荷, 导致局部电场畸变、闪络、爆炸和设备损坏等问题. 由于造成电荷积聚的聚合物载流子深陷阱的主要构成目前仍不清楚, 这一瓶颈问题目前仍未得到有效解决. 本文基于开尔文探针力显微镜(KPFM)和磁力显微镜(MFM)观测了纳米微区聚合物自由基的电荷行为, 发现自由基表现出深陷阱的特性. 第一性原理计算发现出现自由基后的体系中存在深能级缺陷态. 微观和宏观的电荷测量表明, 清除自由基后的聚合物表面电荷量显著减少, 这为聚合物电介质在诸多领域中的安全使用提供了有效的材料改性方案. 本文首次揭示了电介质中的自由基是深陷阱, 为后续关于聚合物电介质的电荷特性方面的研究提供了重要的理论指导.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (52177151, 51631005 and 51907154), the National Key Research and Development Plan of China (2017YFB0902503 and 2016YFB0900802), Beijing Science and Technology Plan (Z191100002019014) and the administration of Tsinghua University.

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Author notes

  1. These authors contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing, 100084, China

    Tianyu Wang  (王天宇), Dayu Li  (李大雨) & Guixin Zhang  (张贵新)

  2. Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Xiaofen Li  (李小芬) & Jianbo Liu  (刘剑波)

  3. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Shaanxi, 710049, China

    Boya Zhang  (张博雅)

Authors
  1. Tianyu Wang  (王天宇)
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  2. Xiaofen Li  (李小芬)
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  3. Boya Zhang  (张博雅)
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  4. Dayu Li  (李大雨)
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  5. Jianbo Liu  (刘剑波)
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  6. Guixin Zhang  (张贵新)
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Contributions

Wang T conceived the idea, Wang T and Zhang G designed the experiments, Wang T carried out the experiments, Li X and Liu J carried out the DFT calculations, and Wang T, Li X, Zhang B, and Li D analyzed the data. Wang T and Li X wrote the manuscript. All authors discussed the results and commented on the manuscript.

Corresponding authors

Correspondence to Jianbo Liu  (刘剑波) or Guixin Zhang  (张贵新).

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Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary information

Experimental details and supporting data are available in the online version of the paper.

Tianyu Wang was born in Gansu province, China in 1995. He is now working towards his PhD degree at the Department of Electrical Engineering, Tsinghua University. His research interests focus on nanometric dielectrics and the surface charge accumulation of polymer materials.

Xiaofen Li received a bachelor’s degree in materials science and engineering from Nanchang University in 2019. She is now a PhD candidate at the Department of Materials Science and Engineering, Tsinghua University. Her current research interests focus on using the first-principle calculations to study the defect properties and ferroelectric polarization properties of perovskite photoelectric materials.

Jianbo Liu is an associate professor at the School of Materials Science and Engineering, Tsinghua University. He earned his doctoral degree from the Department of Materials Science and Engineering at Tsinghua University in 2002. He did postdoctoral research at the Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign from 2003 to 2008. His research interests include simulation of clean energy storage materials, such as perovskite photovoltaic materials and lithiumion battery electrode materials.

Guixin Zhang was born in Tianjin, China in 1963. He received his BS and MS degrees from the Department of Electrical Engineering, Tsinghua University in 1987 and 1993, respectively, and a PhD degree from the Department of Physics, Nanyang Technological University in Singapore in 1999. His current research interests are polymer dielectrics, plasma, high voltage insulation, optical fiber sensor, and electronic current/voltage transformer.

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Wang, T., Li, X., Zhang, B. et al. Basic reason for the accumulation of charge on the surface of polymer dielectrics. Sci. China Mater. 65, 2884–2888 (2022). https://doi.org/10.1007/s40843-022-2055-1

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  • DOI: https://doi.org/10.1007/s40843-022-2055-1

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