Enhancing energy storage performance in tungsten bronze ceramics utilizing site engineering
Yuejun Dan, Liupan Tang, Wenzhi Ning, Changzheng Hu, Laijun Liu, Liang Fang
Abstract
Advanced electronic systems and innovative pulsed power applications are driving the rapid development of high-energy-storage density and high-efficiency capacitors. In the present study, we have prepared SrBa3.5Sm0.5R0.5Nb9.5O30 (R = Mn, Ti, Sn, Hf) (henceforth referred to as SBSRN) ceramics by solid-phase synthesis, using a site engineering strategy that utilizes tetravalent ions for the substitution of Nb5+ at the B-site of tetragonal phase tungsten bronzes. SBSRN ceramics benefit from site engineering strategies to enhance overall energy storage performance. As a result, they achieve a substantial energy storage density of 4.31 J·cm-3 and an impressive efficiency of 91.3% when subjected to an electric field of 340 kV·cm-1, and show excellent stability in ferroelectric performances with variable temperature and frequency. In addition, these ceramics have a large discharge energy density of 2.68 J·cm-3 and a fast discharge time of 62 ns in charge/discharge tests, along with a current density of 619.96 Acm-2 and a power density of 65.1 MWcm-3. In summary, this research offers a promising method for developing energy storage materials that hold potential for innovative applications in pulsed power components.