High-entropy enhanced capacitive energy storage

Yang, Bingbing; Zhang, Yang; Pan, Hao; Si, Wenlong; Zhang, Qinghua; Shen, Zhonghui; Yu, Yong; Lan, Shun; Meng, Fanqi; Liu, Yiqian; Huang, Houbing; He, Jiaqing; Gu, Lin; Zhang, Shujun; Chen, Lei; Zhu, Jing; Chen, Nan; Lin, Yuan‐Hua

doi:10.1038/s41563-022-01274-6

Cited by 303 publications

(185 citation statements)

References 55 publications

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“…With the rapid development of the economy and society, the environmental pollution caused by fossil energy has prompted people to continuously develop and store renewable energy, such as solar energy, hydrogen energy, wind energy, and thermal energy. − Due to the absence of ion migration and chemical reactions in the energy storage process, dielectric capacitors provide a higher power density and more excellent safety than other energy storage devices (lithium-ion batteries and chemical capacitors). , However, no energy storage device has both high energy density and high power density, and improving the energy density of dielectric capacitors has always puzzled researchers. Ferroelectrics have been extensively studied as a popular multifunctional material in areas such as dielectric capacitors, ferroelectric photovoltaics, and information storage. ,− According to the calculations shown in Figure , the key to boosting the energy density of dielectric capacitors is to choose materials with high maximum polarization ( P max ), improve dielectric breakdown field strength (BDS), and decrease remanent polarization ( P r ) …”

Section: Introductionmentioning

confidence: 99%

Significantly Enhanced Energy Storage Performance in High Hardness BKT-Based Ceramic via Defect Engineering and Relaxor Tuning

Wang

Wei

et al. 2022

ACS Appl. Mater. Interfaces

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Hybrid electric cars and pulsed power technologies have increased the demand for capacitors with high energy density, wide temperature stability, high operating voltage, and good mechanical qualities. In this work, (1 − x) (0.6Bi 0.5 K 0.5 TiO 3 -0.4BiFeO 3 )-x(Na 0.4 Sm 0.2 NbO 3 ) ((1 − x) (BKTBF)-xNSN) relaxor ceramics were prepared by constructing morphotropic phase boundary (MPB) combined with oxygen vacancy defect engineering. It is worth noting that the 0.6BKT-0.4BFO ceramics at MPB have a high P max ∼ 60 μC/cm 2 . The ultra-hard (H V = 10.7 GPa) BKTBFO-0.16NSN relaxor ferroelectric ceramic achieves a high W rec of 6.52 J/cm 3 , a working temperature of 20−120 °C, and a working frequency of 1−1000 Hz. Additionally, the BKTBFO-0.16NSN ceramic demonstrates comprehensive pulse charge−discharge performance (I max = 17.2 A, C D = 546.7 A/cm 2 , P D = 54.7 MW/cm 3 , and t 0.9 = 59 ns) and excellent stability (25−125 °C and 10 4 charge−discharge cycles). This study offers a novel approach for the practical implementation of high-performance pulse capacitors, which will undoubtedly stimulate further research and development of high-P max energy storage dielectrics (such as BNT, BKT, and BFO).

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Section: Introductionmentioning

confidence: 99%

Significantly Enhanced Energy Storage Performance in High Hardness BKT-Based Ceramic via Defect Engineering and Relaxor Tuning

Wang

Wei

et al. 2022

ACS Appl. Mater. Interfaces

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“…The cocktail effect, which means an enhancement of physical properties beyond the simple mixture of those of constituent elements, is one of the central issues of HEAs. This effect is found in HEAs that show catalytic [13], thermoelectric [14], magnetic [15], and capacitive energy storage [16] behaviors. The other current issue is the advancement of functionality based on the large compositional space, which is the characteristic feature of HEAs.…”

Section: Introductionmentioning

confidence: 88%

Superconductivity and hardness of the equiatomic high-entropy alloy HfMoNbTiZr

Kitagawa¹,

Hoshi²,

Kawasaki³

et al. 2022

Preprint

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“…The leakage current density is suppressed by one order of magnitude at charge neutralization, from 2×10 -5 A/cm 2 (fChitosan =0) to 10 -6 A/cm 2 (fChitosan=0.8%) at the electric field of 100 MV/m, reaching the lowest level (highest resistivity) which can rival most of the recently reported high-energy dielectric materials. (2,12,13,29) The great improvement of the resistivity should be ascribed to the suppression of mobile charges by the charge neutralization at the critical mass ratio (0.8 wt%) in the PVDF@Chitosan hybrid system. Combining all these merits, the charge-neutralized PVDF latex film shows great potential for practical dielectric energy storage applications.…”

Section: Figure 3fmentioning

confidence: 99%

“…Thus, a combination of large polarization variation (Pm-Pr) and high breakdown strength Eb is highly desired to achieve a high 𝑈 d . (13) Conventional dielectric materials are ceramics with large spontaneous polarization and excellent thermal stability. (14) Yet they suffer from low breakdown strength and challenging processing conditions.…”

Section: Introductionmentioning

confidence: 99%

Charge-Neutralized Colloids for Waterborne High-Energy Dielectrics

Che

Zakri

et al. 2022

Preprint

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Colloids are attractive building blocks for the assembly of organized functional materials. However, their stabilizing surface charges limit the high voltage tolerance and the capacitive energy storage of resultant solid films, which has long remained challenging for dielectric applications of colloids. Here, we propose a strategy of electrostatically complexing colloids with oppositely charged polyelectrolytes to neutralize their surface charges and achieve waterborne high-energy dielectrics. Polyvinylidene fluoride latex, a reference dielectric polymer, interacts electrostatically with a biosourced polycation, chitosan, to generate hybrid particles with tunable surface charge properties. The presence of chitosan prevents the coalescence of the latex particles, yet drives their assembly to form closely packed heterogeneous films. At the isoelectric point where the dispersion exhibits a zeta potential close to 0, the resulting nanocomposites demonstrate the highest Weibull breakdown strength (630 MV/m) and recoverable energy density (10.1 J/cm3), which are respectively 279% and 421% higher than the coalesced counterpart. The validated principle has been successfully extended to other colloidal systems, such as polystyrene latex and aqueous bentonite suspension, highlighting the versatility of the proposed approach to develop waterborne high-energy dielectric materials.

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High-entropy enhanced capacitive energy storage

Cited by 303 publications

References 55 publications

Significantly Enhanced Energy Storage Performance in High Hardness BKT-Based Ceramic via Defect Engineering and Relaxor Tuning

Significantly Enhanced Energy Storage Performance in High Hardness BKT-Based Ceramic via Defect Engineering and Relaxor Tuning

Superconductivity and hardness of the equiatomic high-entropy alloy HfMoNbTiZr

Charge-Neutralized Colloids for Waterborne High-Energy Dielectrics

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