Dielectric capacitors are useful energy storage components because of their fast charging and discharging speeds. However, their energy storage capability — their energy density — is typically low compared with other devices like batteries, limiting their widespread implementation. High-entropy materials, which contain five or more elements in similar proportions, are promising energy materials because of their vast compositional flexibility, enabling performance optimization. Now, writing in Nature Materials, Jing Zhu, Ce-Wen Nan, Yuan-Hua Lin and colleagues show that using entropy engineering for dielectric capacitor fabrication leads to high-performing devices with high energy density.

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