超弱的极化-菌株合效应可以促进容量储能储能.
Leiyang Zhang1, Ruiyi Jing1, Yunyao Huang1
1Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Advanced materials (Deerfield Beach, Fla.)
|August 13, 2024
概括
研究人员开发了一种新的多层陶电容 (MLCC) 策略,减少应变并改善能量存储. 这一创新提高了脉冲动力系统的MLCC耐用性.
科学领域:
- 材料科学 材料科学 材料科学
- 电气工程 电气工程
- 固态物理 固态物理
背景情况:
- 多层陶电容 (MLCC) 由于高电场 (E) 在脉冲动力系统中面临挑战,导致疲劳和电阻应变损伤.
- 现有的MLCC在高能储能性能和在强烈电荷下材料耐用性之间的权衡中扎.
研究的目的:
- 为MLCCs开发一种创新策略,通过实现超弱的极化-应变合效应来最大限度地降低电阻应变.
- 为了提高MLCC的能量存储性能 (ESP) 和可靠性,用于要求高的脉冲动力应用.
主要方法:
- 研究了一种新组成:0.55(Bi0.5Na0.5) TiO3-0.45Pb(Mg1/3Nb2/3) O3以达到超低的电阻系数 (Q33).
- 分析了原子尺度的结构异质性及其对应用电场下的离子位移和晶格结构的影响.
- 制造和测试的MLCC设备用于评估储能密度,效率,耐疲劳性和温度稳定性.
主要成果:
- 实现了0.012 m4 C-2的超低电阻系数 (Q33),在330 kV cm-1下显著降低了应变到0.118%,达到0.118%.
- 在原子尺度上观察到一个扩展和松散的格子结构,在格子拉伸上促进离子位移极化.
- 证明了令人印象深刻的能量储存密度14.6 J cm-3和93%的效率在720 kV cm-1,具有出色的耐疲劳性和温度稳定性.
结论:
- 建议的超弱极化-应变合策略有效地减少了MLCC中的应变,并增强了ESP.
- 原子尺度的结构特征是实现低电阻系数和优异的能量存储的关键.
- 这些先进的MLCC提供了一个有希望的,具有成本效益的解决方案,用于在需要低应变振动的脉冲动力系统中可靠运行.
相关概念视频
Dielectric Polarization in a Capacitor
4.6K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.6K
Energy Stored in a Capacitor
3.6K
When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.
3.6K
Energy Stored in Capacitors
468
A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...
468
Capacitor With A Dielectric
3.9K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
3.9K
Capacitors
425
Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
When a voltage source is connected to a capacitor, positive and negative charges accumulate on the opposite plates. This accumulation generates a potential difference that equals the product of the...
When a voltage source is connected to a capacitor, positive and negative charges accumulate on the opposite plates. This accumulation generates a potential difference that equals the product of the...
425
MOS Capacitor
747
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
747


