Multifunctional BaTiO₃‐(Bi_0.5Na_0.5)TiO₃‐based MLCC with high‐energy storage properties and temperature stability

Abstract

BaTiO 3 -(Bi 0.5 Na 0.5 )TiO 3 (BTBNT)-based multilayer ceramic capacitor (MLCC) chips with the inner electrodes being Ag0.6/Pd0.4 are prepared by a roll-to-roll casting method. The BTBNT-based MLCC chips with ten-dielectric layers can be sintered very well at a low temperature of 1130°C via two-step sintering (TSS). X-ray diffraction (XRD) and transmission electron microscope (TEM) resultsshow that MLCC chips are a core-shell structure with two phases coexistence.The core exhibits a tetragonal phase at room temperature and then gradually changes into a cubic phase when the temperature increases above T c (175°C).While, the shell exhibits a pseudocubic phase at all tested temperature from 25°C to 500°C. BTBNT-based MLCC chips exhibit a broad temperature stability and meet the requirement of Electronic Industries Association (EIA) X9R specifications. In terms of energy storage performance, a large discharge energy density of 3.33 J/cm 3 can be obtained at 175°C under the applied electric field of 480 kV/ cm. Among all tested temperature ranging from −50°C to 200°C, the energy efficiency of all chips is higher than 80%, even under a high applied electric field.The experimental results indicate that this novel BTBNT-based X9R MLCCs can be one of the most promising candidates for energy storage applications, especially operated in high temperature. K E Y W O R D Score-shell structure, energy storage, multilayer ceramic capacitor (MLCC), two-step sintering (TSS), X9R

Multifunctional barium titanate ceramics via chemical modification tuning phase structure

“…Figure 11C gives the distribution of W rec and η for typical lead‐free and lead‐based bulk ceramics. A similar W rec ceiling is observed in BT‐, 129,166‐190 KNN‐, 189‐193 and ST‐based ceramics 189,194 because of their similar electric‐field induced polarization. A larger W rec can be achieved in lead‐free BNT‐, 189,195,196 BFO‐, 189,197‐199 NN‐, 200,201 and lead‐based ceramics, 202‐204 due to the larger polarization or higher BDS.…”

“…Until now, the addition of Bi 3+ ‐based compounds is the most useful method to optimize the energy storage performance of BT ceramic by inducing the formation of relaxor state, such as BaTiO 3 ‐BiMO 3 , BaTiO 3 ‐Bi(M, N)O 3 , BaTiO 3 ‐(Bi, M)NO 3 , where M = Li + , Na + , K + , Zn 2+ , Mg 2+ , Al 3+ , Ni 3+ , rare‐earth ions, etc. and N = Zr 4+ , Ti 4+ , Sn 4+ , Nb 5+ , Ta 5+ , etc 129,166‐189 . As we know, Bi 3+ has a lone‐pair electronic 6s 2 configuration, being analogous to Pb 2+ , which supports large polarizability under high electric field.…”

“…B1‐B3, Evolution of ε r ‐ T curves, P ‐ E loops, and W rec , W loss and η for BT‐based ceramics with the ferroelectric phase, relaxor phase, and crossover state between them. C, Distribution of W rec and η for BT‐, BNT‐, BFO‐, KNN‐, NN‐, ST‐, AN‐, and Pb‐based ceramics 129,165‐206 . D1, ε r ‐ T curves of BaTiO 3 ‐ x K 0.73 Bi 0.09 NbO 3 (BT‐ x KBN) ceramics at 1 kHz.…”

High electrostrictive properties and energy storage performances with excellent thermal stability in Nb-doped Bi0.5Na0.5TiO3-based ceramics

“…Despite this, our Nbdoped BNT-based ceramics attained superior results in temperature stability in both strain and energy storage performances compared with other currently promising materials, as shown in Table 1. [30][31][32][33][34][35] Therefore, these results provide new strategies for the application researches of BNT-based ceramics.…”

High permittivity and excellent high‐temperature energy storage properties of X9R BaTiO3–(Bi0.5Na0.5)TiO3 ceramics

“…In our previous studies, we fabricated a BaTiO 3 –(Bi 0.5 Na 0.5 )TiO 3 (BTBNT)‐based ceramic with dielectric constant of up to 1973 and a corresponding BTBNT‐based MLCC that achieved a discharge energy density of 3.33 J/cm 3 at 175°C . Because of the high Curie temperature and polarization of (Bi 0.5 Na 0.5 )TiO 3 (BNT), which is used here to modify the BTBNT‐based powder to improve its discharge energy density at high temperature.…”