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Achieving ultrahigh energy storage density and efficiency in 0.90NaNbO3–0.10BaTiO3 ceramics via a composition modification strategy
Dalton Transactions ( IF 3.5 ) Pub Date : 2022-06-07 , DOI: 10.1039/d2dt01265k
Hua Wang 1, 2 , Enzhu Li 1, 2 , Mengjiang Xing 3 , Chaowei Zhong 1, 2
Affiliation  

Ceramic capacitors feature great power density, fast charge/discharge rates, and excellent thermal stability. The poor energy storage density of ceramic capacitors, on the other hand, significantly limits their application in power systems. In this work, a high recoverable energy storage density of Wrec = 2.68 J cm−3 and an ultrahigh efficiency of η = 90% are simultaneously achieved in the 0.90NaNbO3–0.10BaTiO3 ceramic by doping (Bi0.7La0.3)(Mg0.67Ta0.33)O3 (NNBT–xBLMT). Due to its high bandgap, the NNBT–0.10BLMT ceramic has a large dielectric breakdown strength (BDS) of 414 kV cm−1, consistent with the first-principles calculation based on density functional theory (DFT). Moreover, the NNBT–0.10BLMT ceramic exhibits excellent charge/discharge characteristics, with an ultrahigh current density CD of 526.06 A cm−2 and a high power density PD of 52.61 MW cm−3. In particular, the NNBT–0.10BLMT ceramic exhibits an outstanding temperature (20 °C–110 °C), frequency (10 Hz–120 Hz), and cycling (104 cycles) stability, highlighting its application potential in MLCCs.

中文翻译:

通过成分改性策略在 0.90NaNbO3–0.10BaTiO3 陶瓷中实现超高储能密度和效率

陶瓷电容器具有高功率密度、快速充电/放电速率和出色的热稳定性。另一方面,陶瓷电容器较差的储能密度极大地限制了它们在电力系统中的应用。在这项工作中,通过掺杂(Bi 0.7 La 0.3)在0.90NaNbO 3 –0.10BaTiO 3陶瓷中同时实现了W rec = 2.68 J cm -3的高可恢复储能密度和η = 90%的超高效率( Mg 0.67 Ta 0.33 )O 3 (NNBT- xBLMT)。由于其高带隙,NNBT-0.10BLMT 陶瓷具有 414 kV cm -1的大介电击穿强度 (BDS) ,与基于密度泛函理论 (DFT) 的第一性原理计算一致。此外,NNBT-0.10BLMT陶瓷表现出优异的充放电特性,具有526.06 A cm -2的超高电流密度C D和52.61 MW cm -3的高功率密度P D。特别是NNBT-0.10BLMT陶瓷表现出出色的温度(20°C-110°C)、频率(10 Hz-120 Hz)和循环(10 4个循环)稳定性,突出了其在MLCC中的应用潜力。
更新日期:2022-06-07
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