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The math on the strontium carbonate storage goes like this (assuming I didn't mess it up):
The SrCO3 -> SrO + CO2 reaction takes 235 kJ/mol.
SrCO3 has a molar mass of 148 g/mol.
So it can absorb 1.6 MJ/kg. Pumping water is only 9.8 J/kg per meter height, so it takes 500x more water in the 1000ft lift example. For comparison, burning coal is ~25 MJ/kg.
To store 10 GWH or 36,000 GJ, you'd need about 22,500 metric tons of SrCO3. Also you'd generate 6 ML or 1.3 million gallons of liquefied CO2. That's a lot, but still in the range of large silos.
The SrCO3 doesn't start decomposing until 1500 C, so this would take a big solar concentration factor to be efficient. It's doable for commercial-size concentrated solar plants though.
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