Abstract
Multilayer ceramic capacitors (MLCCs) for energy storage applications require a large discharge energy density and high discharge/charge efficiency under high electric fields. Here, 0.87BaTiO3-0.13Bi(Zn2/3(Nb0.85Ta0.15)1/3)O3 (BTBZNT) MLCCs with double active dielectric layers were fabricated, and the effects of inner electrode and sintering method on the energy storage properties of BTBZNT MLCCs were investigated. By using the pure Pt as inner electrode instead of Ag0.6Pd0.4 alloys, an alternating current (AC) breakdown strength (BDS) enhancement from 1047 to 1500 kV/cm was achieved. By investigating the leakage current behavior of BTBZNT MLCCs, the Pt inner electrode and two-step sintering method (TSS) were confirmed to enhance the Schottky barrier and minimize the leakage current density. With relatively high permittivity, dielectric sublinearity, and ultra-high BDS, the Pt TSS BTBZNT MLCCs exhibited a surprisingly discharge energy density (Udis) of 14.08 J/cm3. Moreover, under an operating electric field of 400 kV/cm, the MLCCs also exhibited thermal stability with Udis variation < ±8% over a wide temperature (t) range from -50 to 175 °C and cycling reliability with Udis reduction < 0.3% after 3000 charge-discharge cycles. These remarkable performances make Pt TSS BTBZNT MLCCs promising for energy storage applications.
Highlights
Multilayer ceramic capacitors (MLCCs) have been widely investigated because of their high power density, fast charge–discharge capability, and long lifetime, compared with lithium-ion batteries, fuel cells, and electrochemical super capacitors [1,2,3]
The submicron grains of 0.87BaTiO3–0.13Bi (Zn2/3(Nb0.85Ta0.15)1/3)O3 (BTBZNT) MLCCs are much smaller than the micron grains of reported ceramics for energy storage applications [13,14,15,16,17,18,19,20,21], and the dielectric layers contained over 10 grains to obtain stable dielectric property
The broader (002) peak of the Pt two-step sintering method (TSS) MLCCs than the Pt OSS MLCCs (2θFWHM = 0.104°) implied finer grains according to Debye–Scherrer equation, which is consistent with SEM results
Summary
Multilayer ceramic capacitors (MLCCs) have been widely investigated because of their high power density, fast charge–discharge capability, and long lifetime, compared with lithium-ion batteries, fuel cells, and electrochemical super capacitors [1,2,3]. The submicron grains (mean grain size, G = 434 nm) of 0.87BaTiO3–0.13Bi (Zn2/3(Nb0.85Ta0.15)1/3)O3 (BTBZNT) MLCCs are much smaller than the micron grains of reported ceramics for energy storage applications [13,14,15,16,17,18,19,20,21], and the dielectric layers contained over 10 grains to obtain stable dielectric property Because of their thin dielectric layers [22,23,24,25,26,27,28], remarkable AC breakdown strengthen (BDS) of 1047 kV/cm and a maximum discharge energy density (Umax) of 10.1 J/cm were achieved
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
