This idea with storing electrons is different to a regular battery or capacitor.

Imagine how can fill a container with a gas. Now imagine filling it with individual electrons.

I’ve added more ideas about how can maybe contain electrons. For example maybe how a diamagnetic material like a superconductor or pyrolytic graphite or bismuth repels magnetism then maybe could repel magnetism of each electron and in turn repelling each electron. Therefore maybe could make a container out of a diamagnetic material.

Maybe even eddy currents can repel magnetism / each electron. So maybe could make a container out of just something like copper or aluminum.

I’ve also mentioned ideas with storing the radio wave spectrum of light. Like maybe the higher the spectrum of light the more difficult it is to store inside of a container. So maybe how radio wave spectrum of light are reflected by a conductive material then maybe could make a container out of a conductive material and store each radio wave inside.