Enhancement of thermal stability and energy storage capability of flexible Ag nanodot/polyimide nanocomposite films<i>via in situ</i>synthesis

Xing, Shuang; Pan, Zhongbin; Wu, Xiaofeng; Chen, Hanxi; Lv, Xujiao; Li, Peng; Liu, Jinjun; Zhai, Jiwei

doi:10.1039/d0tc02516j

Cited by 36 publications

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“…[1][2][3][4][5] Electrostatic capacitors possess the highest power densities, i.e., up to 10 7 -10 8 High-temperature polymers, including polyimide (PI), polyetherimides (PEI), polycarbonate (PC), fluorene polyester (FPE), and poly(ether ether ketone) (PEEK), have been examined as polymer dielectrics owing to their high glass transition temperatures (T g ) and excellent thermal stability. [9,13,[19][20][21][22][23][24][25][26][27] However, as the electrical conduction increases exponentially with the increase of temperature and the applied electric field, high energy loss and large reductions in η, and discharged energy density (U e ) are found in the polymers at temperatures even well below their T g . [28][29][30] For instance, U e and η of Kapton PI with a T g of ≈360 °C drop precipitately from 1.53 J cm −3 and 95.2% at room temperature to 0.82 J cm −3 and 55.7%, respectively, as temperature rises to 150 °C.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh Energy Storage Performance of Layered Polymer Nanocomposites over a Broad Temperature Range

et al. 2021

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2 W kg −1 of batteries and 10 2 -10 6 W kg −1 of electrochemical capacitors, among the energy storage devices. [6,7] Polymers represented by biaxially oriented polypropylene (BOPP) are preferred dielectrics for high-energydensity capacitors because of their high breakdown strength (>700 MV m −1 ), low energy loss (0.02% at 25 °C), great reliability, and facile processability. [8] One of the critical challenges for technological implementation of polymer dielectrics is the largely deteriorated capacitive performance with increasing operation temperature. [9][10][11] While BOPP exhibits excellent charge-discharge efficiencies (η) at room temperature, its η decreases steeply with increasing temperature, e.g., from 96.2% at 25 °C to 68.5% at 120 °C at 400 MV m −1 , which limits the operation of BOPP at temperatures below 105 °C under the applied fields. [12,13] At temperatures above 85 °C, the operating voltage of BOPP film capacitors must be derated. On the other hand, the rising trend of transportation electrification and the growing demand for electronics used in harsh environment applications, such as those found in aerospace and underground oil and gas exploration systems, require polymer dielectrics to operate efficiently at high temperatures. [9,[14][15][16][17] For instance, in electric vehicles, BOPP film capacitors in the power converters are located near engines where the temperature is around 140-150 °C. [18] To reach the full potential of polymer dielectrics in advanced electronics and electrified transportation, it calls for efficient operation of high-energy-density dielectric polymers under high voltages over a wide temperature range. Here, the polymer composites consisting of the boron nitride nanosheet/polyetherimide and TiO 2 nanorod arrays/polyetherimide layers are reported. The layered composite exhibits a much higher dielectric constant than the current high-temperature dielectric polymers and composites, while simultaneously retaining low dielectric loss at elevated temperatures and high applied fields. Consequently, the layered polymer composite presents much improved capacitive performance than the current dielectric polymers and composites over a temperature range of 25-150 °C. Moreover, the excellent capacitive performance of the layered composite is achieved at an applied field that is about 40% lower than the typical field strength of the current polymer composites with the discharged energy densities of >3 J cm −3 at 150 °C. Remarkable cyclability and dielectric stability are established in the layered polymer nanocomposites. This work addresses the current challenge in the enhancement of the energy densities of high-temperature dielectric polymers and demonstrates an efficient route to dielectric polymeric materials with high energy densities and low loss over a broad temperature range.

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Section: Introductionmentioning

confidence: 99%

Ultrahigh Energy Storage Performance of Layered Polymer Nanocomposites over a Broad Temperature Range

et al. 2021

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“…S14. † 7,12,13,18,19,26,33,[39][40][41][42][43][44][45][46][47] For instance, the maximum U e values of PEI/BTNP/BNNS, A-P-A-P-A, BT-BCB@DPAES(D), PEI/STNPs, XL-VK-2, c-BCB/Al 2 O 3 NPLs, and PEI/Al 2 O 3 @ZrO 2 were 2.92, 3.00, 3.10, 3.18, 3.95, 4.10, and 5.15 J cm À3 at 150 C, respectively, 7,13,18,41,[44][45][46] which were less than those obtained in this study. Furthermore, it must be emphasized that, compared to highly doped nanocomposites, nanocomposites with low llings have great potential and benet from less introduction of interfacial defects and agglomerates.…”

Section: Resultsmentioning

confidence: 99%

“…[28][29][30][31] Several studies have revealed that conductor llers with ultralow loading contents can improve the breakdown strength (E b ) and U e of polymer lms. [32][33][34][35] For instance, Shen et al enhanced the dielectric constant ($50%) and breakdown strength ($15%) by synthesizing trace Ag nanodots (0.05 vol%) in a poly(vinylidene uoride-hexauoropropylene) matrix, resulting in an improved room temperature (RT) discharged energy density owing to the Coulomb blockade effect. 32 In comparison with semiconductors and insulating nanollers, ultrane metal nanoparticles can effectively enhance E b and maintain a low dielectric loss of polymers at a low ller loading by utilizing their unique small size and Coulomb blockade effects.…”

Section: Introductionmentioning

confidence: 99%

“…32 In comparison with semiconductors and insulating nanollers, ultrane metal nanoparticles can effectively enhance E b and maintain a low dielectric loss of polymers at a low ller loading by utilizing their unique small size and Coulomb blockade effects. [32][33][34][35] However, the doping of conductive nanollers into polymers limits ller agglomeration and compatibility between the ller and polymer matrix, which is an unavoidable challenge for industrial large-area fabrication owing to complex multi-step synthesis and processing. 36 Therefore, there is an urgent need to develop a new scalable and cost-effective method to synchronously improve the breakdown strength and energy-storage properties of conductor/polymer composites at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced high-temperature energy storage properties of polymer composites by interlayered metal nanodots

Dong

Niu

et al. 2022

J. Mater. Chem. A

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“…For comparison, the U d and η of previously reported representative monolayer composites are summarized in Figure . ,,,,− In brief, the red part presents high energy density, while the blue part presents high efficiency. Hence, the optimal energy storage properties of composites ought to be presented in the direction of the green arrow.…”

Section: Resultsmentioning

confidence: 99%

Ultra-Fine Gold Nanoparticles Enabled Au-BST NF/PVTC Composites to Have Excellent Energy Storage Performance

Xiong

Zhang

Yang

2021

ACS Appl. Energy Mater.

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Composites composed of a polymer matrix and inorganic fillers have attracted tremendous attention owing to their promising application in flexible dielectric film capacitors. However, boosting the energy density while ensuring a high charging-discharging efficiency is still a huge challenge. In this work, Ba0.6Sr0.4TiO3 nanofibers (BST NFs) doped with different contents of ultra-fine Au nanoparticles are precisely prepared by one-step electrospinning, and P(VDF-TrFE-CFE) (PVTC)-based composites incorporated with various nanofibers are further prepared via a solution-casting process. A superior discharged energy density of 14.2 J/cm3 and an excellent energy storage efficiency of 71.3% have been achieved in such monolayer composites by optimizing the doping content and distribution of ultra-fine Au nanoparticles in BST NFs, which are induced by enhanced electric displacement and ensure suppressed energy loss and improved electric breakdown strength. Hence, doping moderate ultra-fine metal nanoparticles in one-dimensional inorganic nanofillers is a feasible strategy for designing polymer-based composites with outstanding performance.

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Enhancement of thermal stability and energy storage capability of flexible Ag nanodot/polyimide nanocomposite filmsvia in situsynthesis

Abstract: High-temperature electrostatic capacitors are in urgent demand owing to the rapidly development of advanced power electronic applications. However, polymer films with favorable discharge energy density and efficiency are still a...

Cited by 36 publications

References 56 publications

Ultrahigh Energy Storage Performance of Layered Polymer Nanocomposites over a Broad Temperature Range

Ultrahigh Energy Storage Performance of Layered Polymer Nanocomposites over a Broad Temperature Range

Enhanced high-temperature energy storage properties of polymer composites by interlayered metal nanodots

Ultra-Fine Gold Nanoparticles Enabled Au-BST NF/PVTC Composites to Have Excellent Energy Storage Performance

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