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Negative Capacitance for Electrostatic Supercapacitors

机译：静电超级电容器的负电容

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摘要

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 degrees C and 10(8) charging/discharging cycles is further demonstrated.
机译：有效存储电能的需求不断增长是向碳中和社会转型的主要挑战之一。尽管与其他存储技术（如电池）相比，静电电容器可以实现更高的功率密度，但其能量密度却相对较低。在此提出并证明，铁电材料中存在的负电容可用于改善电容器的能量存储，使其超过基本极限。尽管以前曾主要考虑将负电容用于低功率电子设备，但事实表明，使用负电容的铁电/介电电容器有望用于储能应用。与使用（反）铁电材料进行静电能量存储的早期结果相比，使用适用于3D基板上集成的非外延薄膜，即使对于超过100 J cm（-3）的超高能量密度，其效率也高达95％以上。进一步证明了高达150摄氏度的稳定运行和10（8）个充电/放电循环。

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