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A spreadsheet with calculations showing the energy density and specific energy of Magnesium and Carbon Dioxide combustion. The spreadsheet also compares the results to the same metrics for Lithium Ion batteries. The spreadsheet assumes 40% efficiency for the combustion, and 90% efficiency for the batteries. Despite this, the magnesium combustion has a Specific Energy of 971.38 Wh/kg and a Energy Density of 1,324.22 Wh/L. This about 4x the Specific Energy of Lithium batteries, and 2x the Energy Density of Lithium batteries.

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A spreadsheet with calculations showing the energy density and specific energy of Magnesium and Carbon Dioxide combustion. The spreadsheet also compares the results to the same metrics for Lithium Ion batteries. The spreadsheet assumes 40% efficiency for the combustion, and 90% efficiency for the batteries. Despite this, the magnesium combustion has a Specific Energy of 971.38 Wh/kg and a Energy Density of 1,324.22 Wh/L. This about 4x the Specific Energy of Lithium batteries, and 2x the Energy Density of Lithium batteries.
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A.C. Tupper (actupper@scicomm.xyz)'s status on Wednesday, 15-Feb-2023 04:34:56 JST A.C. Tupper

Because I'm incorrigible, I just spent the last hour doing the specific energy and energy density math for Magnesium combustion in a Carbon Dioxide atmosphere, comparing it to the same metrics for Lithium Ion batteries.
Assuming you can get a conversion efficiency of 40% (optimistic, to be sure), Mg/CO2 is, per kWh:
- A quarter the weight of Lithium Batteries
- Half the volume of Lithium Batteries
Pretty compelling reasons to peck away at the idea, IMO.
#renewableenergy #climatechange

In conversation Wednesday, 15-Feb-2023 04:34:56 JST from scicomm.xyz permalink