Development of Novel Nanocomposite Dielectrics for High Voltage, High Energy Density Multilayer Ceramic Capacitors (MLCCs) Applications.

C. Tan
Aegis Technology, Inc,
United States

Keywords: nanocompoiste, dielectric, MLCC, high voltage, high energy density, capacitors

Summary:

There are demanding requirements on multilayer ceramic capacitor (MLCC)-based power capacitors in the development of more advanced electronics and platforms for both civic and military applications. Currently used MLCCs, however, suffer from limitations of low energy densities, resulting in bulky/heavy pulsed power systems with high costs. These capacitors contribute significantly to the size and cost of resultant systems. Also, these capacitors exhibit relatively poor temperature stability, which make them difficult in providing the required performance at elevated temperatures (e.g. >160 °C) and/or a wide temperature range. Therefore, in this project, Aegis Technology are developing a novel class of MLCCs based on innovatively designed ceramic-glass nanocomposite dielectrics, which can provide : (1) enhanced energy density (>2 J/cc vs. ~0.2-1.2 J/cc of the state-of-the-art); (2) high operating voltage (>1500 V); (3) low dielectric loss (tan δ ~ 1.0 × 10-3 vs. ~1 - 25 × 10-3 of state-of-the-art); (4) high stability (low temperature coefficient of capacitance, TCC within ±15% across -55ºC to 200ºC vs. ±15% across -55ºC to 125ºC of state-of-the-art), and (5) low costs (as a result of reduced energy consumption by using decreased sintering temperatures and thus lower cost electrode materials such as 70/30 Ag/Pd alloys or even Cu, instead of conventional Pt). In addition, these MLCCs can be processed through cost-effective and scalable techniques that can be easily transferred into a commercial production line. With the support from DoD SBIR programs on this project, Aegis Technology has established the capability in development and large scale production of advanced nanocomposite dielectric for high performance MLCCs.