Bi0.5Na0.5TiO3-based relaxor-ferroelectric ceramics for low-electric-field dielectric energy storage via bidirectional optimization strategy

Excellent energy storage and hardness performance of Sr0.7Bi0.2TiO3 ceramics fabricated by solution combustion-synthesized nanopowders

High-temperature dielectric polymers have a broad application space in film capacitors for high-temperature electrostatic energy storage. However, low permittivity, low energy density and poor thermal conductivity of high-temperate polymer dielectrics constrain their application in the harsh-environment electronic devices, especially under elevated temperatures. Here, the combination of dopamine functionalized MAX (Ti3AlC2) nanosheets and a polyimide (PI) matrix offers a feasible strategy to prepare high-temperature polymer nanocomposites with improved dielectric and thermal performances. The surface functionalized MAX nanosheets with dopamine has guaranteed both the increase of dielectric constant and breakdown strength, leading to improved energy storage capability. As a result, the nanocomposite with 3 wt % functionalized MAX exhibits an enhanced energy density of 2.60 J/cm3 at 30 °C, and the nanocomposite with 1 wt % fillers possess an energy density of 1.19 J/cm3 at 100 °C, more than 1.32 and 1.18 times that of neat PI films (1.97 J/cm3 at 30 °C and 1.01 J/cm3 at 100 °C). In addition, an improved in-plane thermal conductivity of 0.55 W/(m·K) is obtained for PI based nanocomposite with 7 wt % [email protected], which is much higher than that of pure polymer (0.18 W/(m·K)). Our results show that surface modified MAX nanosheets can be used to construct polymer-based nanocomposites with excellent high-temperature energy storage capability and thermal properties. 

Enhancement of high-temperature dielectric energy storage performances of polyimide nanocomposites utilizing surface functionalized MAX nanosheets

An innovative strategy of introducing space charge traps to dielectric materials is developed by copolymerization of MMA with conjugated VK, which enables superior energy storage performance ( U e = 15.7 J cm −3 @ 750 MV m −1 , η = 88%). 

High energy storage density and low energy loss achieved by inserting charge traps in all organic dielectric materials

Extensive research has been carried out to enhance the capacitive energy storage capability of dielectric polymers through the design of multilayer polymer nanocomposites, which typically comprise the polarization layer with...

Multilayer nanocomposites with ultralow loadings of nanofillers exhibiting superb capacitive energy storage performance

To overcome the inherent high hysteresis loss of ferroelectric polymer-based nanocomposites, non-ferroelectric linear dielectric poly(methyl methacrylate) (PMMA) is adopted as the polymer matrix for high discharge efficiency. At the same time, slender ferroelectric BaTiO3 nanowires (BT NWs) with a high dielectric constant are selected as the nanofiller for high energy density. To avoid the agglomeration of BT NWs and enhance the strength of interfaces, dopamine is used as organic coatings to tailor the interface. The BT@dopa NWs/PMMA nanocomposites exhibit excellent interface compatibility between the BT NWs and PMMA matrix and a very good microstructure uniformity. Based on this, hierarchically structured BT@SiO2@dopa NWs are designed and prepared to overcome the uneven electric field distribution at the interface, resulting from the dielectric constant mismatch. The discharged energy density (Ue) can be largely enhanced from 3.76 J/cm3 for pure PMMA films to 11.78 J/cm3 for PMMA-based nanocomposites by incorporating 5.0 wt % BT@SiO2@dopa NWs. In addition, a high discharging efficiency (η) of 91% is obtained simultaneously in the nanocomposites. Both experimental and theoretical simulations demonstrate that the double core-shell structure nanowire fillers can effectively alleviate the local field distortion, inhibit leakage current, and suppress remnant electric displacement, leading to the high Ue and η. These findings are significant in facilitating the development of high-performance film dielectric capacitor materials using PMMA-based nanocomposites toward high energy storage density.

High Energy Storage Performance of PMMA Nanocomposites Utilizing Hierarchically Structured Nanowires Based on Interface Engineering.

High energy-storage performance of lead-free Ba0.4Sr0.6TiO3–Sr0.7Bi0.2TiO3 relaxor-ferroelectric ceramics with ultrafine grain size

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High Energy Storage Performance of PMMA Nanocomposites Utilizing Hierarchically Structured Nanowires Based on Interface Engineering.

High energy-storage performance of lead-free Ba0.4Sr0.6TiO3–Sr0.7Bi0.2TiO3 relaxor-ferroelectric ceramics with ultrafine grain size