Calcium Bromide enthalpy of formation = 647.9 kJ/mol http://en.wikipedia.org/wiki/Calcium_bromideMaximum theoretical energy density is trivial (basic thermodynamics and a molar mass), rechargeability is where the problem is.
But certainly much easier than metallic Sodium in Sodium-Sulfur batteries or metallic lithium in Lithium-air cells. Currently many researchers work on Magnesium-Sulfur battery. They do not report any problems with metallic Magnesium. There are Aluminum-air fuel cells. Is Aluminum less reactive than Calcium?Because of a high reactivity it is not that easy to store metallic calcium (or magnesium) safely and not reacting with whatever is present in the battery.
Metal-bromine batteries are a type of rechargeable battery that uses a combination of a metal anode and a bromine cathode to store and release electrical energy.
Metal-bromine batteries work by converting chemical energy into electrical energy through a redox reaction. The metal anode, usually zinc or lead, reacts with the bromine cathode to produce an electric current.
Metal-bromine batteries have several advantages, including high energy density, long cycle life, and low self-discharge rate. They are also relatively inexpensive and have a wide temperature range for operation.
Metal-bromine batteries have potential applications in various industries, including renewable energy storage, electric vehicles, and aerospace technology. They can also be used as backup power sources for critical systems.
While metal-bromine batteries have many advantages, they also have some limitations and challenges. These include the potential for bromine leakage, which is corrosive and can be harmful to the environment, and the need for a complex and expensive recharging process.