Abstract
A compact superconducting magnetic energy storage system (SMES) produced by Si micro fabrication technologies has been proposed to improve electricity storage volume density, w, in the sub-Wh/L range of conventional SMESs and to produce them at a low cost by mass production. In parallel with the experimental development reported previously, a series of trials was performed to estimate a feasible value of w based on the calculation of the magnetic field generated by the compact SMES by improving the calculation models step by step. In this work, the experimentally obtained magnetic flux density dependence of superconductive critical current density was taken into consideration for the first time in this series of trials, together with the additional improvement of the calculation models. The results of the estimation indicated that a compact SMES produced by the proposed concept can attain a w in the Wh/L range or more, ranking with or surpassing that of presently used capacitors.
Highlights
To increase the w of SMES from a sub-Wh/L level to a sub−10 Wh/L level ranking with the w of capacitors or more, we proposed the concept of a compact SMES, as shown in based on the proposed concept. t is the thickness of the Si wafer and m is the number of stacked Si wafers. b and h represent the approximate external sizes of the composition
Because SMESs and capacitors store electricity based on purely physical phenomena, their abilities of rapid charge and discharge are specific to them in contrast to rechargeable batteries based on an electrochemical phenomenon
SMESs are heavy electric machinery products of a relatively high cost, which is caused by their made-to-order production, while varieties of capacitors are commercially available at low prices thanks to mass production
Summary
Capacitors are typical electronic passive components widely used in varieties of electronic circuits. Capacitors are fundamentally used for electricity storage as the energy of the electric field, which is expressed by Equation (1): Publisher’s Note: MDPI stays neutral ue =. Electricity storage in capacitors is based on an electrostatic, a purely physical phenomenon. The benefit of this fact is the ability of rapid charge and discharge in comparison to rechargeable batteries based on electrochemical reactions. EDLCs are reported with a high electric energy storage density (w). It should be noted that what is called “hybrid energy storage capacitors” are reported to have a higher w, with Specifications 4: Magnetochemistry 2021, 7, 44.
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