Synergistically achieving ultrahigh energy-storage density and efficiency in linear-like lead-based multilayer ceramic capacitor

Although ceramic-based capacitors are indispensable component in advanced electrical systems, the recoverable energy-storage density (Wrec) is often not satisfied. Herein, (Pb0.92La0.02Ca0.06)(Zr0.6Sn0.4)0.995O3 (PLCZS) multilayer ceramic capacitor (MLCC) is fabricated via a tape-casting technique and its energy-storage properties are analyzed in details. An ultrahigh Wrec of 15.9 J cm−3 and a giant efficiency (η) of 92% are achieved synchronously at 760 kV cm−1 by virtue of its linear-like polarization-electric (P-E) hysteresis loop and ultrahigh breakdown strength (BDS). Meanwhile, PLCZS MLCC maintains high η (> 92%) within the frequency range of 1–100 Hz and the temperature range of 30–125 °C. In addition, a high discharge energy density (Wdis) of 11.6 J cm−3 and a large power density (PDmax) of 169.6 MW cm−3 are realized in PLCZS MLCC. These results demonstrate that PLCZS MLCC has a potential application in advanced power electrical systems.