Thermally activated dynamic bonding network for enhancing high-temperature energy storage performance of PEI-based dielectrics

To address the paradox of mutually exclusive confusions between the breakdown strength and polarization of the polymer-based composites at high-temperature, a dynamic multisite bonding network is constructed by connecting the -NH 2 groups of polyetherimide (PEI) and Zn 2+ in metal-organic frameworks...

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Bibliographic Details
Published in:Materials horizons 2023-08, Vol.1 (9), p.3651-3659
Main Authors: Li, Jialong, Liu, Xiaoxu, Huang, Bingshun, Chen, Dongyang, Chen, Zhaoru, Li, Yanpeng, Feng, Yu, Yin, Jinghua, Yi, Haozhe, Li, Taoqi
Format: Article
Language:English
Subjects:
Bonding
Breakdown
Composite materials
Dielectrics
Electric fields
Energy storage
Extreme environments
Fine structure
High temperature
Metal-organic frameworks
Polarization
Polyetherimides
Polymers
Room temperature
X ray absorption
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Summary:To address the paradox of mutually exclusive confusions between the breakdown strength and polarization of the polymer-based composites at high-temperature, a dynamic multisite bonding network is constructed by connecting the -NH 2 groups of polyetherimide (PEI) and Zn 2+ in metal-organic frameworks (MOFs). Owing to the multisite bonding network being dynamically stable at high-temperature, the composites possess a high breakdown strength of 588.1 MV m −1 at 150 °C, which is 85.2% higher than that of PEI. Importantly, the multisite bonding network could be thermally activated at high-temperature to generate extra polarization, which is because the Zn-N coordination bonds are evenly stretched. At similar electric fields, the composites show higher energy storage density at high-temperature compared with that at room temperature, and present excellent cycling stability even with increased electrode size. Finally, the reversible stretching of the multisite bonding network against temperature variation is confirmed by the in situ X-ray absorption fine structure (XAFS) and theoretical calculations. This work presents a pioneering example of the construction of self-adaptive polymer dielectrics in extreme environments, which might be a potential method for designing recyclable polymer-based capacitive dielectrics. The multisite bonding networks in PEI are constructed by using MOFs. The Zn-N bonding in the network could be thermally activated at 150 °C, thus generate extra polarization and endow the composite with excellent energy storage performance.
ISSN:2051-6347
2051-6355
DOI:10.1039/d3mh00499f