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WANG, Xinzhen, SONG, Xiaojie, FAN, Yongbo, LI, Linhao, WANG, Dawei, FETEIRA, Antonio, LU, Zhilun, SINCLAIR, Derek C., WANG, Ge and REANEY, Ian M. (2024). Lead‐Free High Permittivity Quasi‐Linear Dielectrics for Giant Energy Storage Multilayer Ceramic Capacitors with Broad Temperature Stability. Advanced Energy Materials.
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Abstract
Electrostatic energy storage capacitors are essential passive components for power electronics and prioritize dielectric ceramics over polymer counterparts due to their potential to operate more reliably at > 100 ˚C. Most work has focused on non‐linear dielectrics compositions in which polarization (P)/electric displacement (D) and maximum field (Emax) are optimized to give values of energy density, 6≤U≤21 J cm−3. In each case however, either saturation (dP/dE = 0, AFE) or “partial” saturation (dP/dE → 0, RFE) of P limits the value of U which can be achieved before breakdown. It is proposed that U can be further improved with respect to relaxors (RFEs) and anti‐ferroelectrics (AFEs) by designing high permittivity quasi‐linear dielectric (QLD) behaviour in which dP/dE remains constant up to ultrahigh Emax. QLD multilayer capacitor prototypes with dielectric layers composed of 0.88NaNb0.9Ta0.1O3‐0.10SrTiO3‐0.02La(Mg1/2Ti1/2)O3 deliver room temperature U ≈ 43.5 J cm−3, supporting an extremely‐large Emax ≈ 280 MV m−1, both of which exceed current state‐of‐art by a factor of two for devices based on powder, tape‐cast technology. Importantly QLD capacitors exhibit scant variation in U (≈15 J cm−3) up to > 200 ˚C and robust resistance to cyclic degradation, offering a promising new approach for the development of sustainable technology.
| Item Type: | Article |
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| Additional Information: | ** Article version: VoR ** From Wiley via Jisc Publications Router ** Licence for VoR version of this article: http://creativecommons.org/licenses/by/4.0/ **Journal IDs: issn 1614-6832; issn 1614-6840 **Article IDs: publisher-id: aenm202400821 **History: published_online 25-05-2024; rev-recd 30-04-2024; submitted 21-02-2024 |
| Uncontrolled Keywords: | dP(Polarization)/dE(Electric field), high permittivity, quasi linear dielectric, multilayer ceramic capacitors, energy storage |
| Research Institute, Centre or Group - Does NOT include content added after October 2018: | Sheffield Hallam Doctoral Theses |
| Identification Number: | https://doi.org/10.1002/aenm.202400821 |
| SWORD Depositor: | Colin Knott |
| Depositing User: | Colin Knott |
| Date Deposited: | 31 May 2024 15:11 |
| Last Modified: | 24 Jun 2024 10:06 |
| URI: | https://shura.shu.ac.uk/id/eprint/33765 |
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