tech
When an electric-car battery finally wears out, recyclers shred it to recover the costly metals locked inside.
Black mass is the correct term for the dark, metal-rich powder left over after a worn-out battery is shredded during recycling. This powder is valuable because it still contains significant amounts of lithium, nickel, and cobalt, the same costly metals originally mined to build the battery, and refiners can extract these materials from it to feed directly back into manufacturing new batteries.
'Battery ash' and 'carbon slag' are not standard, recognized terms used in the battery recycling industry, and neither accurately describes this specific recovered material or the recycling process that produces it.
Recovering metals from black mass reduces the need for fresh mining, which matters because extracting metals like cobalt and lithium from the ground can be environmentally damaging and geopolitically concentrated in only a few countries.
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