Electrical-energy storage devices

An electrical-energy storage device configured for use in a time-varying electromagnetic field whose variations have a fundamental frequency, the storage device comprising:

• an electrode at least part of which is generally in the form of a sheet having one or more slits therein passing from within the sheet to an edge of the sheet and arranged such that the sheet is in the form of a plurality of strips connected together at one end only, said electrode having a thickness that is less than a predetermined fraction of a skin depth at the fundamental frequency;
• and
• a casing around said electrode wherein the time-varying electromagnetic field can penetrate or pass through the casing with little or no loss.

An electrical-energy storage device configured for use in a time-varying electromagnetic field, the storage device comprising:

• an electrode comprising a plurality of strips connected together so as to hinder the ability of eddy currents induced by said field to circulate therein,
• wherein said electrical-energy storage device has an absorption coefficient less than 0.5% and a reflection coefficient less than 10%.

An electrical-energy storage device configured for use in a time-varying electromagnetic field whose variations have a fundamental frequency, the storage device comprising:

• an electrode at least part of which is generally in the form of a sheet whose thickness is less than a predetermined fraction of a skin depth at the fundamental frequency.

An electrical-energy storage device configured for use in a time-varying electromagnetic field whose variations have a fundamental frequency, the storage device comprising:

• a casing, such as a foil casing, whose thickness is less than a predetermined fraction of a skin depth at the fundamental frequency.

(canceled)