Stereoisomerically enhanced polynorbornene-imide dielectric energy storage performance

Hongmei Qin, Man Liu, Shiyu Qin, Shixian Zhang, Xingnan Zhou, Chenjian Li, Yuhao Wei, Dan Chen, Rong Fan, Shan Wang, Quanling Yang, Chuanxi Xiong, Qing Wang

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Developing dielectric polymers with different stereoisomers may provide a novel strategy to improve electrostatic energy storage performance under harsh environments. However, there is still little research about the effect of polymer stereoisomerism on capacitive energy storage so far. Here, we report a new class of cycloaliphatic polynorbornene-imide (PNC) dielectric with two different spatial configurations and demonstrate that flexural configuration significantly improves the energy storage performance at room temperature and high temperature. ENDO-PNC with flexural configuration possesses slightly higher dielectric constant, comparably large bandgap and dramatically improved thermal properties with respect to EXO-PNC with near-planar configuration. Notedly, ENDO-PNC exhibits dramatically inhibited leakage current density and hopping distance, substantially improved activation energy, electrical resistivity and breakdown strength. Consequently, ENDO-PNC exhibits an ultrahigh discharged energy density (Ud) of 11.10 J/cm3, 9.11 J/cm3 and 6.77 J/cm3 at 25 °C, 150 °C and 200 °C respectively, as high as 1.4 times, 2.0 times and 2.8 times that of EXO-PNC. Moreover, ENDO-PNC delivers a maximum Ud of 6.0 J/cm3 and 3.3 J/cm3 above 90 % efficiency respectively at 150 °C and 200 °C, superior to neat polymers and highly competitive in reported polymer composites. The stereoisomerism effect on dielectric energy storage is further demonstrated in other dielectric polymers, revealing this strategy is universally applicable and particularly meaningful to design and exploit polymer dielectrics working under harsh environments.

Original languageEnglish (US)
Article number149244
JournalChemical Engineering Journal
StatePublished - Mar 1 2024

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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