Electrical storage device with negative capacitance

US11145665B2 · kind B2 · utility

Assignee

• NAMLAB GGMBH · DE

Inventor

• Michael Hoffmann · Gablingen, DE

Key dates

• Filing date: May 1, 2020
• Grant date: Oct 12, 2021
• Expiry date: May 1, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10D30/701

Abstract

The energy density of capacitors can be increased by using a material with differential negative capacitance (NC), which was recently observed in FE materials. Described is a more general pathway towards improved electrostatic energy storage densities by engineering the capacitance non-linearity of electrostatic devices. The disadvantages of regular polarizable materials are overcome by using the NC effect, which ideally has no hysteresis losses, leading to a theoretical efficiency of 100%. By storing the energy mostly in an amorphous DE layer, the break-down field strength is much higher compared to pure FE or AFE storage capacitors. In addition, leakage current losses can be reduced by improving the morphology of the insulating materials used.