Combinatorics

Electrical engineering

Physics

Engineering

Dielectric

Ceramic

Physical chemistry

Composite material

Power (physics)

Voltage

Chemistry

Materials science

Polarization (electrochemistry)

Mathematics

Optoelectronics

Electric field

Engineering physics

Quantum mechanics

Energy storage

Ferroelectricity

Pulsed power

Thermodynamics

Saturation (graph theory)

Chemical Engineering Journal

Seeking for high energy storage materials has become an urgent task in the circumstance of energy crisis. In this work, a series of relaxor ferroelectrics (1 − x)Bi0.5Na0.5TiO3-xSr0.7La0.2TiO3 ((1 − x)BNT-xSLT) with excellent energy storage performance were successfully fabricated. The SLT as a second component was doped into BNT and served three main functions: (1) efficiently decreased the grain size and increased the band gap and thus enhanced the breakdown electric field, (2) drove the ferroelectric phase gradually to a relaxor character, (3) reduced the tolerance factor (t) to defer the electric field of polarization saturation. Eventually, we achieved an impressive recoverable energy storage density (Wrec) of 4.14 J/cm3 and an ultrahigh energy storage efficiency (ƞ) of 92.2% simultaneously at 315 kV/cm in the ceramic of x = 0.45. Furthermore, the sample also exhibited an excellent stability against testing temperature, frequency and cycle, a high power density (182 MW/cm3) and a fast discharge speed (123 ns), all of which are ideal characteristics for high power energy storage devices.

Superior comprehensive energy storage properties in Bi0.5Na0.5TiO3-based relaxor ferroelectric ceramics