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Relaxor ferroelectrics with high energy storage performances are very attractive for modern applications in electronic devices and systems. Here, it is demonstrated that large energy densities (0.52~0.58 J/cm 3) simultaneously with high efficiencies (76%~82%) and thermal stabilities (the variations of efficiencies: 7% from 323 to 423 K) have been achieved in the lead-free (1-x)(BCT-BMT)-xBFO relaxor ferroelectric ceramics prepared using a conventional solid-state reaction method. Large dielectric breakdown strengths and great relaxor dispersions around the dielectric peaks are responsible for the excellent energy storage performances. The energy storage performance of asprepared ceramics at high BFO doping amount (x = 0.06 and 0.07) was deteriorated seriously due to the decrease of dielectric breakdown strengths. However, they could be greatly improved when aged, since the operable electric field was significantly enhanced from 10 kV/cm of as-prepared samples to 100 kV/cm of aged samples due to the reduced concentration of oxygen vacancies during the aging process. The excellent energy storage performance may make them attractive materials for applications in energy storage systems in a broad temperature range.

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