Great enhancement of energy storage density and power density in BNBT/xBFO multilayer thin film hetero-structures,Inorganic Chemistry Frontiers

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Great enhancement of energy storage density and power density in BNBT/xBFO multilayer thin film hetero-structures
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-07-02 00:00:00 , DOI: 10.1039/c8qi00487k
Pan Chen _{1,

2,

3,

4,

5} , Shuanghao Wu _{1,

2,

3,

4,

5} , Peng Li _{1,

2,

3,

4,

5} , Jiwei Zhai _{1,

2,

3,

4,

5} , Bo Shen _{1,

2,

3,

4,

5}

Affiliation

Lead-free 0.94(Bi_0.5Na_0.5)_0.94TiO₃-0.06BaTiO₃/BiFeO₃ (abbreviated as BNBT/xBFO) multilayer thin film hetero-structures were deposited on Pt(111)/Ti/SiO₂/Si substrates using a sol–gel/spin coating method. With the increase of the number of BFO layers, the insulativity and the breakdown field strength can be significantly improved because the interfaces can act as obstructers to the development of the electric field. Furthermore, enhanced dielectric and ferroelectric properties were achieved in BNBT/4BFO thin films with dielectric constant, dielectric loss and maximum polarization of ∼670.7, ∼0.04 and ∼53.57 μC cm⁻² at room temperature, respectively. Furthermore, the BNBT/2BFO thin film capacitor exhibited superior energy storage properties with a recoverable energy density of 31.96 J cm⁻³ and an energy conversion efficiency of 61% under an electric field of 2400 kV cm⁻¹. Moreover, the BNBT/2BFO thin film capacitor presented good thermal stability with minimal variations in the energy density (<10%) and energy conversion efficiency (<5%) over a wide temperature range of 25–120 °C. Moreover, the BNBT/2BFO capacitor possessed a very fast discharge speed with the first half period of 0.6 μs and a relatively high power density of 47 MW cm⁻³ under 1600 kV cm⁻¹. The results indicated that the environmentally friendly BNBT/2BFO thin film hetero-structures show great potential in energy storage capacitor applications.

中文翻译：

BNBT / x BFO多层薄膜异质结构中的储能密度和功率密度大大提高

0.94（铋无铅_0.5的Na _0.5）_0.94二氧化钛₃ -0.06BaTiO ₃ /的BiFeO ₃（缩写为BNBT / X BFO）多层薄膜异质结构沉积在Pt（111）/钛/二氧化硅₂ / Si衬底上使用溶胶-凝胶/旋涂法。随着BFO层数的增加，绝缘性和击穿场强可以得到显着改善，因为界面会阻碍电场的发展。此外，在BNBT / 4BFO薄膜中实现了增强的介电和铁电性能，其介电常数，介电损耗和最大极化分别为〜670.7，〜0.04和〜53.57μCcm ^-2。分别在室温下。此外，在2400kV cm ^-1的电场下，BNBT / 2BFO薄膜电容器表现出优异的能量存储特性，具有31.96J cm ^-3的可恢复能量密度和61％的能量转换效率。此外，BNBT / 2BFO薄膜电容器具有良好的热稳定性，在25-120°C的宽温度范围内，能量密度（<10％）和能量转换效率（<5％）的变化很小。此外，BNBT / 2BFO电容器具有非常快的放电速度，前半周期为0.6 s，在1600 kV cm ^-1下具有相对较高的功率密度47 MW cm ^-3。。结果表明，环保的BNBT / 2BFO薄膜异质结构在储能电容器应用中显示出巨大的潜力。

更新日期：2018-07-02

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