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by Animats 2079 days ago
The system they like, the near-isothermal compressor with a "liquid piston", is described here.[1] They wrote up a description of a small prototype, but don't seem to have built one. The University of Arizona lab from which that paper came does not seem to be doing anything with energy storage any more.

[1] http://www.u.arizona.edu/~deymier/deymier_group/refs/CAES.pd...