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Dielectric capacitors with high capacitive energy storage are urgently needed to meet the growing demand for high-performance energy storage devices. Herein, a novel lead-free Sr5BiTi3Nb7O[Formula: see text] (SBTN) tungsten bronze relaxor ferroelectric ceramic is prepared and explored for potential energy storage applications. A high recoverable energy density [Formula: see text] ([Formula: see text] 3.72 J/cm3) and ultrahigh efficiency [Formula: see text] ([Formula: see text] 94.2%) at 380 kV/cm are achieved simultaneously. Both [Formula: see text] and [Formula: see text] exhibit superior stabilities against temperature (30–140[Formula: see text]C), cycles (100 –105) and frequency (1–500 Hz). In addition, a high current density of 796 A/cm2 and a large power density of 71.7 MW/cm3 are achieved, together with good thermal endurance and fatigue resistance. These results demonstrate that the obtained SBTN ceramic can be deemed as the promising candidates for dielectric capacitor applications.

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