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Negative Capacitance for Electrostatic Supercapacitors
Author(s) -
Hoffmann Michael,
Fengler Franz Paul Gustav,
Max Benjamin,
Schroeder Uwe,
Slesazeck Stefan,
Mikolajick Thomas
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201901154
Subject(s) - supercapacitor , capacitance , capacitor , materials science , energy storage , ferroelectricity , dielectric , optoelectronics , electric potential energy , negative impedance converter , nanotechnology , engineering physics , power (physics) , electrical engineering , voltage , electrode , physics , quantum mechanics , voltage source , engineering
The increasing demand for efficient storage of electrical energy is one of the main challenges in the transformation toward a carbon neutral society. While electrostatic capacitors can achieve much higher power densities compared to other storage technologies like batteries, their energy densities are comparatively low. Here, it is proposed and demonstrated that negative capacitance, which is present in ferroelectric materials, can be used to improve the energy storage of capacitors beyond fundamental limits. While negative capacitance was previously mainly considered for low power electronics, it is shown that ferroelectric/dielectric capacitors using negative capacitance are promising for energy storage applications. Compared to earlier results using (anti)ferroelectric materials for electrostatic energy storage, much higher efficiencies of more than 95% even for ultrahigh energy densities beyond 100 J cm −3 are demonstrated using nonepitaxial thin films suitable for integration on 3D substrates. Stable operation up to 150 °C and 10 8 charging/discharging cycles is further demonstrated.