The idea is not all about containing each electron on the surface of the conductive wall its about each free electron flying around inside of the container. Like a bottle that initially had a vacuum that are filled with air (atoms). Instead of filling with air can maybe just fill with each free electron to fly around inside.

If each conductive atom of the inner conductive surface cannot collect any more electron then perhaps any other electron inside of the container to remain flying around inside. Which can perhaps add enough electrons inside to not be collected with the inner conductive surface.

I’ve explained this in this post.

If ever heard of an electron emitter or electron gun basically I guess just have a negative electrode which can emit each electron. This can perhaps be how can emit each electron into a container. I think to have the inner surface of the container be conductive so can be as a negative electrode. Which the conductive surface could perhaps also be used to remove each electron. The inner conductive surface can perhaps be able to be used as a negative or positive / ground electrode or not used as an electrode perhaps like with just storing each electrode.

To prevent each electron from colliding with the inner wall of the container could perhaps be to use a material that repels magnetism like a diamagnetic material like a superconductor or pyrolytic graphite or bismuth. This way can maybe repel each electrons magnetism and in turn repelling each electron.

Maybe could even just use a conductive material like copper or aluminum. Basically maybe each electron’s magnetism can create eddy currents of the conductive material to perhaps be able to repel each electrons magnetism and repel each electron that way. Which maybe could just use the inner conductive surface to repel with eddy currents.

Also mentioned other stuff in this post like maybe since each electron constantly moves maybe like with zero point energy then could perhaps generate energy like electric current. Also mentioned in this post an idea with storing radio wave spectrum of light in a conductive container.

Regarding storing electrons in a container.

This is different than a battery or regular capacitor.

The idea is to contain each electron inside of a container without being attached to an atom. Like a once empty / vacuum container filled with electrons flying around inside.