Ternary polymer nanocomposites with concurrently enhanced dielectric constant and breakdown strength for high‐temperature electrostatic capacitors

He, Li; Ren, Lulu; Ai, Ding; Han, Zhubing; Liu, Yang; Yao, Bin; Wang, Qing

doi:10.1002/inf2.12043

Cited by 130 publications

(92 citation statements)

References 56 publications

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“…The initial increase in the E b of the PI‐TiO 2 composites could be attributed to the contribution of the interfaces between the nanoparticles and the polymer, which serves as effective electron scatters and trapping centers to impede charge conduction in the composites. [ 16,17 ] As shown in Figures S6 and S7 in the Supporting Information, further increase of the filler concentration results in decreased E b , [ 42,43 ] which matches the change of the electrical conductivity of the composites as discussed below.…”

Section: Figuresupporting

confidence: 68%

Tuning Nanofillers in In Situ Prepared Polyimide Nanocomposites for High‐Temperature Capacitive Energy Storage

Zhou

et al. 2020

Advanced Energy Materials

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303

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of 140 °C or above. [4,5] While dielectric ceramics are traditional materials for high-temperature capacitors, [6] they are severely limited by scalability, weight, fracture toughness, and breakdown strength in comparison to their polymer counterparts. [7][8][9][10][11][12][13][14][15][16][17] Biaxially oriented polypropylene film (BOPP), the state-of-the-art commercially available polymer dielectric, however, shows largely degraded high-field dielectric properties when operating at temperatures above 100 °C. [18] To address these imperative needs, a variety of well-established engineering polymers, including polycarbonate, polyimide (PI), polyetherimides, and poly(ether ether ketone), have been exploited as hightemperature dielectric materials. [19][20][21][22][23][24][25] As these aromatic polymers have high glass transition temperatures (T g ) and excellent thermal stability, it is anticipated that the engineering polymers would retain electromechanical properties and thus dielectric stability at high temperatures. However, when subjected to high applied fields, the engineering polymers exhibit limited working temperatures that are much lower than their T g s. [19,20] More recently, inorganic fillers represented by boron nitride nanosheets (BNNSs) have been incorporated into crosslinked divinyltetramethyldisiloxane-bis(benzocyclobutene) (c-BCB) to yield the dielectric polymer composites capable of operating efficiently at high temperatures, e.g. 150 °C. [26][27][28][29] Herein, we describe the hightemperature dielectric properties and capacitive performance of the PI-based polymer nanocomposites prepared via in situ polycondensation. Compared with c-BCB, PI possesses the inherent advantages including much better processability, considerably lower cost, and greater mechanical strength and flexibility, which potentially offers a scalable route toward robust hightemperature dielectric materials. [30,31] The investigation of the polymer composites containing the inorganic nanofillers with systematically varied dielectric constants (K) and bandgap (ΔE), including aluminium oxide (Al 2 O 3 ) with a K of 9.5 and a ΔE of 8.6 eV, hafnium dioxide (HfO 2 ) with a K of 25 and a ΔE of 5.8 eV, titanium dioxide (TiO 2 ) with a K of 110 and a ΔE of 3.5 eV, and BNNS with a K of 4 and a ΔE of 5.97 eV, [26,[32][33][34] would provide experimental guidelines for the design of highperformance high-temperature dielectric polymer composites. Modern electronics and electrical systems demand efficient operation of dielectric polymer-based capacitors at high electric fields and elevated temperatures. Here, polyimide (PI) dielectric composites prepared from in situ polymerization in the presence of inorganic nanofillers are reported. The systematic manipulation of the dielectric constant and bandgap of the inorganic fillers, including Al 2 O 3 , HfO 2 , TiO 2 , and boron nitride nanosheets, reveals the dominant role of the bandgap of the fillers in determining and improving the high-temperature capacitive performance of the polymer compo...

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Section: Figuresupporting

confidence: 68%

Tuning Nanofillers in In Situ Prepared Polyimide Nanocomposites for High‐Temperature Capacitive Energy Storage

Zhou

et al. 2020

Advanced Energy Materials

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303

227

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“…In the low-frequency range (10 2 -10 6 Hz), space charge polarization had an important influence on the dielectric properties. Ion polarization and electron polarization play a main role to affect the dielectric properties when the frequency increased above 10 6 Hz [32][33][34][35]. The main contribution of blend films to the dielectric constant was the interface polarization, which is a kind of space charge polarization.…”

Section: Resultsmentioning

confidence: 99%

Designing Micro Bulge Structure with Uniform PS Microspheres for Boosted Dielectric Hydrophobic Blend Films

et al. 2020

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In this paper, homogeneous polystyrene (PS) microspheres with controllable sizes of 40 nm, 80 nm, and 120 nm were synthesized by controlling the temperature of solvothermal method. In order to explore the effect of PS microspheres on dielectric-hydrophobic properties of the composite films, the composite films containing polystyrene, Polydimethylsiloxane, and P(VDF-TrFE) with high dielectric and hydrophobicity were successfully prepared by a simple and feasible solution blending method. The dielectric constant and hydrophobicity of composite films were boosted by increasing the mass fraction of PS content and decreasing the size of PS due to the enhanced interfacial polarization and the uniform surface micro bulge structure. Meanwhile, the composite films maintain a low loss tangent. Typically, the dielectric constant with 5 wt.% 40 nm PS reached to 29 at 100Hz, which is 4 times that of PDMS/P(VDF-TrFE) (mass ratio: 2/3). Otherwise, the largest the contact angle of 126° in the same composition was remarkably larger than the pure PDMS/P(VDF-TrFE) (110°). These improved properties have more potential applications in the electric wetting devices.

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“…Last but not the least, electrochemical properties of the supercapacitor electrode materials in the literature are usually focused on capacity, cycle stability, coulombic efficiency, energy density and power density, which are not aligned with their practical applications in an actual supercapacitor cell. To realize electrode materials accessible to practical applications, other performance parameters, such as the mass loading, internal resistance, self-discharge, leakage current as well as floating charge at higher temperature, 178 should be assessed as shown in Fig. 28.…”

Section: Tri-heteroatom Doped Porous Carbonsmentioning

confidence: 99%

Effect of pore structure and doping species on charge storage mechanisms in porous carbon-based supercapacitors

Xie

et al. 2020

Mater. Chem. Front.

117

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Ternary polymer nanocomposites with concurrently enhanced dielectric constant and breakdown strength for high‐temperature electrostatic capacitors

Cited by 130 publications

References 56 publications

Tuning Nanofillers in In Situ Prepared Polyimide Nanocomposites for High‐Temperature Capacitive Energy Storage

Tuning Nanofillers in In Situ Prepared Polyimide Nanocomposites for High‐Temperature Capacitive Energy Storage

Designing Micro Bulge Structure with Uniform PS Microspheres for Boosted Dielectric Hydrophobic Blend Films

Effect of pore structure and doping species on charge storage mechanisms in porous carbon-based supercapacitors

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