Journal
COMPOSITES PART B-ENGINEERING
Volume 230, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109493
Keywords
Dielectric capacitors; Energy storage; Charge-discharge; Lead-free; Ion selective engineering
Funding
- Natural Science Foundation of Shandong Province of China [ZR2020QE043]
- Natural Science Foundation of Zhejiang Province [LY20E020008, LQ16E020004]
- National Natural Science Foundation of China [51802063]
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Through ion selective engineering, Bi-modified SrTiO3 solid-solution ceramics demonstrate excellent performance in energy efficiency, energy density, and thermal stability, offering potential solutions for electrostatic energy storage applications.
Dielectric capacitors possess high power density and ultrafast charge/discharge speed in comparison to other electrical energy storage devices, but lag behind in energy density, efficiency and thermal stability, which has been a major hurdle for industrial applications. Here we demonstrate that high energy efficiency of 97%, together with a large energy density of 3.71 J/cm3 realized at 340 kV/cm as well as satisfactory thermal stability of energy density (with minimal variation of 10%), and energy efficiency ( 97%) within a broad temperature range at 270 kV/cm, can be achieved in Bi-modified SrTiO3 solid-solution ceramics though ion selective engineering. The formation of polar nano-regions with high dynamic, rapid reversibility, and low switching energy barriers, as confirmed by in situ piezoresponse force microscope and Raman, enables linear-like polarization-field response and highly thermal stable polarization response with concurrently enhanced energy efficiency and density. Additionally, the designed ceramic also exhibits large power density of 114.3 MW/cm3, medium discharge energy density of 1.64 J/cm3, and ultrafast discharge rate of 57 ns along with excellent thermal and fatigue endurances. These findings suggest that ion selective engineering-designed Bi-modified SrTiO3 relaxor ferroelectric ceramic can offer realistic solutions to successfully tailor pulsed power capacitors for electrostatic energy storage.
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