Stereoisomerically enhanced polynorbornene-imide dielectric energy storage performance

IF 13.2 1区 工程技术 Q1 ENGINEERING, CHEMICAL
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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Abstract

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.

Abstract Image

Abstract Image

立体异构增强聚降冰片烯-酰亚胺介电储能性能
开发具有不同立体异构体的介电聚合物可为改善恶劣环境下的静电储能性能提供一种新策略。然而,迄今为止,有关聚合物立体异构体对电容储能影响的研究仍然很少。在此,我们报告了一类具有两种不同空间构型的新型环脂族聚降冰片烯-酰亚胺(PNC)电介质,并证明了挠曲构型可显著改善室温和高温下的储能性能。与近平面构型的 EXO-PNC 相比,具有挠曲构型的 ENDO-PNC 介电常数略高,带隙相当大,热性能也有显著改善。值得注意的是,ENDO-PNC 能显著抑制漏电流密度和跳变距离,大幅提高活化能、电阻率和击穿强度。因此,ENDO-PNC 在 25 ℃、150 ℃ 和 200 ℃ 时的超高放电能量密度 (Ud) 分别为 11.10 J/cm3、9.11 J/cm3 和 6.77 J/cm3,分别是 EXO-PNC 的 1.4 倍、2.0 倍和 2.8 倍。此外,ENDO-PNC 在 150 ℃ 和 200 ℃ 时的最大 Ud 分别为 6.0 J/cm3 和 3.3 J/cm3,效率高于 90%,优于纯聚合物,在已报道的聚合物复合材料中极具竞争力。立体异构对电介质储能的影响在其他电介质聚合物中也得到了进一步证实,这表明这种策略具有普遍适用性,尤其适用于设计和开发在恶劣环境下工作的聚合物电介质。
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来源期刊
Chemical Engineering Journal
Chemical Engineering Journal 工程技术-工程:化工
CiteScore
21.70
自引率
9.30%
发文量
6781
审稿时长
2.4 months
期刊介绍: The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.
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