Eli5: Given their location on the periodic table and the abundance of sodium compared to lithium, why aren’t we using sodium-ion batteries?
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We are currently researching them. The problem is that metallic sodium needs high temperatures to be a usefull battery.
There exist sodium-in-watery-solution batteries, also just called salt-watery-battery. These have very low energy density though, wich means they would be larger and heavier than an old lead-acid type.
Research tries to find a room temperature alternative using some organic electrolyte
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