https://deutsche-wirtschafts-nachrichten.de/2019/01/16/deutsche-wissenschaftler-entwickeln-revolutionaere-magnesium-batterien/ (translation required)
Don't know if they're any better than lithium batteries, but here are the relative global reserves of both metals:
- magnesium - 2.4 billion metric tons
- lithium - less than 20 million metric tons
Source for Mg data - http://metalpedia.asianmetal.com/metal/magnesium/resources&production.shtml
Source for Li data - https://www.statista.com/statistics/268790/countries-with-the-largest-lithium-reserves-worldwide/
Draw your own conclusions.
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