Enhanced energy storage properties of Bi(Ni2/3Nb1/6Ta1/6)O3-NaNbO3 solid solution lead-free ceramics

Sodium niobate energy storage ceramics with good environmental performance are widely used in electric power conversion and pulse power system, large energy storage density and high efficiency, huge power density and charge and discharge faster. In this work, (1-x)NaNbO3-xBi(Ni2/3Nb1/6Ta1/6)O-3 [(1 x)NN-xBNNT] (0.12 <= x <= 0.18) ceramics system were prepared by solid state reaction method. By introducing Bi(Ni2/3Nb1/6Ta1/6)O-3 (BNNT), a relaxation strategy was constructed, which significantly improved the energy storage properties of NaNbO3 (NN) based ceramics. Finally, comparatively high recoverable energy density (W-rec) of 3.43 J/cm(3) and large energy storage efficiency (eta) of 83.3% were obtained in 0.86NN 0.14BNNT ceramics. Besides discharge energy density (W-d) of 0.69 J/cm(3), ultra fast charge-discharge rate (t(0.9)) of 55 ns, the power density (P-D) of 70.66 MW/cm(3) and the current density (C-D) of 883.23 A/cm(2) were also observed in ceramic.

Automated summary

In this study, the energy storage properties of NaNbO3 (NN) based ceramics were improved by introducing Bi(Ni2/3Nb1/6Ta1/6)O-3 (BNNT). The 0.86NN 0.14BNNT ceramics exhibited high recoverable energy density, energy storage efficiency, ultra-fast charge-discharge rate, and other performance.