Polyimide Nanodielectrics Doped with Ultralow Content of MgO Nanoparticles for High-Temperature Energy Storage

Qin, Hongmei; Song, Jinhui; Liu, Man; Zhang, Xiaolin; Wang, Shan; Xiong, Chuanxi

doi:10.3390/polym14142918

Cited by 12 publications

(7 citation statements)

References 41 publications

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“…In Figure 1a, whether film or powder, all the five samples show the characteristic peaks of imide rings including 1770, 1722, and 1380 cm −1 , respectively, corresponding to the asymmetric, symmetric stretching vibration peaks of CO bond and the stretching vibration peak of C–N group. [ 37–39 ] The result indicates that the cyclodehydration process from PAA to PI has successfully occurred. The 3D sphere‐like PI crystals are insoluble in DMAc, so the in situ polymerization method under the action of ultrasound irradiation is conducive to producing evenly dispersion.…”

Section: Resultsmentioning

confidence: 98%

Facile Preparation and Boosted Electrochemical Properties of Carbon/Carbon Composite Electrodes for Supercapacitors

Wang

et al. 2023

Energy Tech

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Herein, a kind of carbon/carbon composite electrode is prepared using polyimide (PI)/3D sphere‐like polyimide composite films as precursors, followed by carbonization. 2,2‐bis(3‐amino‐4‐hydroxyphenyl)hexafluoropropane and 4,4’‐(hexafluoroisopropylidene)diphthalic anhydride are polymerized and thermally imidized to form the matrix, and 3D sphere‐like PI particles synthesized by the solvothermal process are introduced via the in situ polymerization method. The electrochemical behaviors of C/C composites are examined in relation to the loading of the 3D sphere‐like PI crystals and carbonization temperatures. The C/C composite PI/5%3D‐PI‐800 demonstrates a specific capacitance maximum of 322.7 F g−1 at 0.5 A g−1 due to synergistic effects between different types of PIs. The specific capacitance decreases to 214 F g−1 with a retention rate of 66.3% as the current density increases to 10 A g−1. Moreover, the symmetrical supercapacitor (SC) assembled by PI/5%3D‐PI‐800 shows a specific capacitance of 244.4 F g−1 at 0.5 A g−1, with a high energy density of 33.94 Wh kg−1 and a power density of 500 W kg−1. In addition, after 6 months of storage, the button SC is retested and still shows fantastic capacitance retention rate of above 99.5%. Thus, this work proposes a facile method to fabricate the C/C composite electrodes with outstanding electrochemical properties.

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Section: Resultsmentioning

confidence: 98%

Facile Preparation and Boosted Electrochemical Properties of Carbon/Carbon Composite Electrodes for Supercapacitors

Wang

et al. 2023

Energy Tech

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“…Both the improvement of spatial charge polarization by MgO and the enhancement dispersity of nanofillers by PDA play essential roles in raising the dielectric constant. 49 The S-15 sample obtains an enormous dielectric constant, 6.78 (1 kHz), as shown in Figure 5E, and increases by 91.5% compared to pure PI film (3.54). While the dielectric constant of the S-20 sample decreases to 4.85.…”

Section: Filmsmentioning

confidence: 92%

Construction of sandwich‐layered polyimide hybrid films containing double core–shell structured fillers for high energy storage density

Cao,

Zhang,

Zhao

et al. 2023

Polymer Composites

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The inherent low dielectric constant of polyimide (PI) dielectrics restricts their applications to become a component of high energy density film capacitors. In this work, double core–shell structured barium titanate@magnesium oxide@polydopamine (BaTiO3@MgO@PDA) nanoparticles were synthesized successfully and utilized as high dielectric constant functional fillers for PIs, in which the insulating MgO layer meliorated dielectric constant difference between BaTiO3 and PI matrix, and the organic PDA layer improved the compatibility between the inorganic fillers and PI matrices. Then, a series of sandwich‐structured PI‐based hybrid films was prepared through a layer‐by‐layer solution casting method. The middle layer of pure PI with excellent insulating properties effectively suppressed charge injection. With the combination of sandwich structure and the BaTiO3@MgO@PDA nanoparticles, the PI hybrid film containing 15 wt% fillers in the outer layers achieved the maximum breakdown strength of 425.68 kV/mm and the maximum energy density of 5.132 J/cm3, which was 68.3% and 413% higher than those of pure PI film, respectively, meanwhile maintained a low dielectric loss value of 0.0083 at 1 kHz. The introduction of BaTiO3@MgO@PDA enhanced the interfacial polarization due to the high barrier energy between adjacent layers preventing the transfer of electrons and weakening the leakage current in the sandwich‐structured composite film. This work demonstrates that an appropriate combination of high dielectric hybrid fillers and multilayer structure can effectively increase the energy storage density of PI substrate for high‐temperature energy storage applications.Highlights The double core–shell structured BaTiO3@MgO@PDA was synthesized successfully. The sandwich‐structured hybrid films were prepared by layer‐by‐layer method. The energy density of hybrid films reached a high value of 5.132 J/cm3.

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“…[15][16][17][18][19][20][21] Another effective strategy is introducing deep traps by employing largeband gap inorganic fillers (e.g., BNNS, Al 2 O 3 , and MgO, etc.) [22][23][24][25][26][27][28] or molecular semiconductors with high electron affinity. [29][30][31][32] Crosslinking has also been proven to remarkably improve the breakdown strength and charge-discharge efficiency of polymer dielectrics at high temperatures by creating a range of molecular trapping centers.…”

Section: Materials Horizonsmentioning

confidence: 99%

“…, BNNS, Al 2 O 3 , and MgO, etc. ) 22–28 or molecular semiconductors with high electron affinity. 29–32 Cross-linking has also been proven to remarkably improve the breakdown strength and charge–discharge efficiency of polymer dielectrics at high temperatures by creating a range of molecular trapping centers.…”

Section: Introductionmentioning

confidence: 99%

Alicyclic polyimides with large band gaps exhibit superior high-temperature capacitive energy storage

Song

Qin

et al. 2023

Mater. Horiz.

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Polyimide Nanodielectrics Doped with Ultralow Content of MgO Nanoparticles for High-Temperature Energy Storage

Cited by 12 publications

References 41 publications

Facile Preparation and Boosted Electrochemical Properties of Carbon/Carbon Composite Electrodes for Supercapacitors

Facile Preparation and Boosted Electrochemical Properties of Carbon/Carbon Composite Electrodes for Supercapacitors

Construction of sandwich‐layered polyimide hybrid films containing double core–shell structured fillers for high energy storage density

Alicyclic polyimides with large band gaps exhibit superior high-temperature capacitive energy storage

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