Excellent energy storage performance of niobate-based glass-ceramics via introduction of nucleating agent

For glass-ceramics, how to realize the collaborative optimization of BDS and permittivity is the key to improve the energy storage density. In this work, ZrO2 is introduced into BPKNAS glass-ceramics as nucleating agent to promote crystal development of glass-ceramics and then achieve high permittivity. When 1.5 mol% ZrO2 is added, the glass-ceramics have the highest permittivity (similar to 128.59) and meanwhile possess high BDS (1948.90 kV/cm) due to the dense microstructure. Therefore, BPKNAS-1.5ZrO(2) glassceramics has the highest theoretical energy storage density (21.62 J/cm(3)). Moreover, the permittivity variation of BPKNAS-1.5ZrO(2) glass-ceramics is less than 6 % in the wide temperature range from -80 to 300 degrees C, showing excellent temperature stability. In addition, BPKNAS-1.5ZrO(2) glass-ceramics possesses ultrahigh power density, which reaches up to 382.40 MW/cm(3) in overdamped circuit. The above evidence shows that BPKNAS-1.5ZrO(2) glass-ceramics with ultrahigh energy storage density and power density is very competitive in the field of energy storage applications. (C) 2022 The Chinese Ceramic Society. Production and hosting by Elsevier B.V.