Energy storage performance of Na0.5K0.5NbO3-P(VDF-TrFE) lead-free composite films

  • Yang Liu
  • Zhiliang Diao
  • Chao Zhao
  • Wen WangEmail author
  • Yu Zhou
Original Paper: Sol-gel and hybrid materials for dielectric, electronic, magnetic and ferroelectric applications


The lead-free Na0.5K0.5NbO3-Poly(vinylidene fluoride-trifluoroethylene) (KNN-P(VDF-TrFE)) composite films were prepared by sol-spin coating method. The KNN film was annealed at 700 °C for 3 min with the P(VDF-TrFE) film annealed then at 160 °C for 2 h. The ferroelectric and energy storage properties of composite films were also investigated. The energy storage density of the composite films reached 7.58 J/cm3, and the efficiency was 52%. In addition, the KNN-P(VDF-TrFE) composite films showed weak leakage behavior.

(a) Schematic diagram of the composite films. (b) P-E hysteresis loops of KNN-P(VDF-TrFE) composite films with different film layers and concentration of P(VDF-TrFE) at 1 kHz, the annealing process was 160 °C for 2 hours. “K/0.02 P × 1” means “KNN-1 layer of P(VDF-TrFE) composite films, and the solution is 0.02 g/ml”. (c) Leakage current density of composite films at 1000 kV/cm.


  • The P(VDF-TrFE) (Poly(vinylidene fluoride-trifluoroethylene)) films were annealed at different temperatures and characterized by Integrated Ferroelectric Measurement System and then get the storage density of 3.30 J/cm3 at the η = 33%.

  • The 2-2 KNN-P(VDF-TrFE) composite films were prepared to get high energy storage density for the first time.

  • The ferroelectric and energy storage performance of KNN-P(VDF-TrFE) composite films were studied and the storage density can reach 7.58 J/cm3 at the η = 52%.


Energy storage Na0.5K0.5NbO3(KNN) Poly(vinylidene fluoride-trifluoroethylene)(P(VDF-TrFE)) Composite films 



This work was financially supported by the National Natural Science Foundation of China (Grant No. 51372055, 51621091).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest. The manuscript has been approved by all authors listed and it is an original research that has not been published previously or under consideration for publication in whole or in part elsewhere.


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute for Advanced Ceramics, School of Materials Science and EngineeringHarbin Institute of TechnologyHarbinP. R. China

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