Cobalt is used to help stabilise lithium-ion batteries. It can help manufacturers make batteries safer, while increasing energy density and ultimately improving battery life. However 70% of the world's cobalt mining happens in the Democratic Republic of the Congo, a country that is rich in minerals, but also economically poor.

Michael Davie's report for Foreign Correspondent: https://www.youtube.com/watch?v=_V3bIzNX4co

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