Significantly improved energy storage performances of K0.5Na0.5NbO3 lead-free ceramics via a composition optimization strategy

Minquan Wang; Ying Lin; Qibin Yuan; Miao Zhang; Yiwen Yu; Fei Yan; Haibo Yang

doi:10.1039/D3QI00676J

Significantly improved energy storage performances of K_0.5Na_0.5NbO₃ lead-free ceramics via a composition optimization strategy†

Minquan Wang,^a Ying Lin,*^a Qibin Yuan,^b Miao Zhang,^c Yiwen Yu,^d Fei Yan*^e and Haibo Yang

*^a

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^a Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
E-mail: linying@sust.edu.cn, yanghaibo@sust.edu.cn

^b School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi'an 710021, China

^c Xi'an Rare Metal Materials Research Institute Co., Ltd, Xi'an 710016, China

^d State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China

^e School of Advanced Materials and Nanotechnology, Xidian University, Xi'an 710071, China
E-mail: yanfei@xidian.edu.cn

Abstract

Ceramic dielectric materials for energy storage have been widely investigated because of the superior advantages of a rapid charge/discharge speed and ultra-high power density. However, there are no significant breakthroughs in integrative energy storage density and efficiency improvements. In this work, a composition optimization scheme for boosting the synergistic energy storage performances of K_0.5Na_0.5NbO₃ (KNN)-based ceramics has been proposed, namely diminishing the grain size to the sub-micron scale for enhancing the breakdown strength (BDS) and generating nanodomains for reducing the remanent polarization (P_r) by incorporating the Bi³⁺ ion and (Mg_2/3Ta_1/3)³⁺ multiple ions into the A-site and B-site of the KNN matrix. As a result, it is confirmed that an ultrahigh recoverable energy storage density (W_r) of 6.14 J cm⁻³ and a high energy storage efficiency (η) of 87% are realized simultaneously for the (1 − x)K_0.5Na_0.5NbO₃–xBi(Mg_2/3Ta_1/3)O₃ (KNN–BMT) ceramics at x = 0.15 under 720 kV cm⁻¹, which surpass most other reported lead-free ceramics. Moreover, the outstanding thermal and frequency stability associated with variation rates of W_r and η below 10% is verified. All these merits indicate that the doped Bi(Mg_2/3Ta_1/3)O₃ component leads to optimized energy storage performances. This work may attract significant attention in exploring ceramic dielectric capacitors with excellent properties for energy storage applications.

Inorganic Chemistry Frontiers

Significantly improved energy storage performances of K_0.5Na_0.5NbO₃ lead-free ceramics via a composition optimization strategy†

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Significantly improved energy storage performances of K_0.5Na_0.5NbO₃ lead-free ceramics via a composition optimization strategy

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Inorganic Chemistry Frontiers