Is Ragone plot analysis useful for electric energy storage?

of electric energy storage. Ragone plot analysis is under-utilized for technologies where energy and power are separately scal-able (decoupled E-P). There is value in Ragone plot analysis for these technologies by characterizing off-design performance in a common framework.

What are 'Ragone plots' for thermal storage?

In addition to the work by Yazawa et al., Christen developed what he referred to as ‘Ragone plots’ for thermal storage, but approached it from a simplified thermodynamic perspective that cannot evaluate specific materials or designs of thermal storage devices 28.

Can rate capability and Ragone plots be generated for Sensible thermal storage devices?

Although not the focus here, rate capability and Ragone plots can also be generated for sensible thermal storage devices, where the rate capability curve will be approximately linear throughout the discharge process (similar to the voltage response of an electrical capacitor).

Why is the Ragone curve bounded by the efficiency of the thermodynamic cycle?

In general, the Ragone curve is bounded by the efficiency of the thermodynamic cycle and the available energy is reduced at higher powers due to imperfect heat exchange. Both characterizations are theoretical but are a solid basis for further practical analysis. For details, the reader is referred to the respective publications [28,31].