TY - JOUR
T1 - Realizing Outstanding Energy Storage Performance in KBT-Based Lead-Free Ceramics via Suppressing Space Charge Accumulation
AU - Li, Yexin
AU - Chang, Ziliang
AU - Zhang, Manlin
AU - Zhu, Mankang
AU - Zheng, Mupeng
AU - Hou, Yudong
AU - Zhou, Qiyuan
AU - Chao, Xiaolian
AU - Yang, Zupei
AU - Qi, He
AU - Chen, Jun
AU - Liu, Zhaobo
AU - Huang, Houbing
AU - Ke, Xiaoxing
AU - Sui, Manlin
N1 - Publisher Copyright:
© 2024 Wiley-VCH GmbH.
PY - 2024/9/12
Y1 - 2024/9/12
N2 - The great potential of K1/2Bi1/2TiO3 (KBT) for dielectric energy storage ceramics is impeded by its low dielectric breakdown strength, thereby limiting its utilization of high polarization. This study develops a novel composition, 0.83KBT-0.095Na1/2Bi1/2ZrO3-0.075 Bi0.85Nd0.15FeO3 (KNBNTF) ceramics, demonstrating outstanding energy storage performance under high electric fields up to 425 kV cm−1: a remarkable recoverable energy density of 7.03 J cm−3, and a high efficiency of 86.0%. The analysis reveals that the superior dielectric breakdown resistance arises from effective mitigation of space charge accumulation at the interface, influenced by differential dielectric and conductance behaviors between grains and grain boundaries. Electric impedance spectra confirm the significant suppression of space charge accumulation in KNBNTF, attributable to the co-introduction of Na1/2Bi1/2ZrO3 and Bi0.85Nd0.15FeO3. Phase-field simulations reveal the emergence of a trans-granular breakdown mode in KNBNTF resulting from the mitigated interfacial polarization, impeding breakdown propagation and increasing dielectric breakdown resistance. Furthermore, KNBNTF exhibits a complex local polarization and enhances the relaxor features, facilitating high field-induced polarization and establishing favorable conditions for exceptional energy storage performance. Therefore, the proposed strategy is a promising design pathway for tailoring dielectric ceramics in energy storage applications.
AB - The great potential of K1/2Bi1/2TiO3 (KBT) for dielectric energy storage ceramics is impeded by its low dielectric breakdown strength, thereby limiting its utilization of high polarization. This study develops a novel composition, 0.83KBT-0.095Na1/2Bi1/2ZrO3-0.075 Bi0.85Nd0.15FeO3 (KNBNTF) ceramics, demonstrating outstanding energy storage performance under high electric fields up to 425 kV cm−1: a remarkable recoverable energy density of 7.03 J cm−3, and a high efficiency of 86.0%. The analysis reveals that the superior dielectric breakdown resistance arises from effective mitigation of space charge accumulation at the interface, influenced by differential dielectric and conductance behaviors between grains and grain boundaries. Electric impedance spectra confirm the significant suppression of space charge accumulation in KNBNTF, attributable to the co-introduction of Na1/2Bi1/2ZrO3 and Bi0.85Nd0.15FeO3. Phase-field simulations reveal the emergence of a trans-granular breakdown mode in KNBNTF resulting from the mitigated interfacial polarization, impeding breakdown propagation and increasing dielectric breakdown resistance. Furthermore, KNBNTF exhibits a complex local polarization and enhances the relaxor features, facilitating high field-induced polarization and establishing favorable conditions for exceptional energy storage performance. Therefore, the proposed strategy is a promising design pathway for tailoring dielectric ceramics in energy storage applications.
KW - breakdown field strength
KW - dielectric energy storage
KW - interfacial polarization
KW - KBiTiO
KW - lead-free ceramics
KW - space charge accumulation
UR - http://www.scopus.com/inward/record.url?scp=85192755364&partnerID=8YFLogxK
U2 - 10.1002/smll.202401229
DO - 10.1002/smll.202401229
M3 - Article
C2 - 38733235
AN - SCOPUS:85192755364
SN - 1613-6810
VL - 20
JO - Small
JF - Small
IS - 37
M1 - 2401229
ER -