I haven't seen any good summary, but there's one new contender that needs to be mentioned: hydrogen peroxide.
It doesn't burn, but oxidizes heavily whatever it touches, releasing energy in the process. Can also be used in fuel cells.
In pure form it's even nastier than ammonia, but contrary to that chemical it's liquid at room temperature. Also it mixes well with water producing a less nasty solution.
Energy density is low, but that is not a constraint for grid storage.
From reading Ignition, a book about the development of liquid rocket fuels, there was quite a lot of research into using peroxide as an oxidizer. But turns out it's really hard to make it behave during storage.
It doesn't burn, but oxidizes heavily whatever it touches, releasing energy in the process. Can also be used in fuel cells.
In pure form it's even nastier than ammonia, but contrary to that chemical it's liquid at room temperature. Also it mixes well with water producing a less nasty solution.
Energy density is low, but that is not a constraint for grid storage.