Fairer trade should help this situation. I'm sure those people would buy better equipment and improve working conditions if they could afford to. Such a job should pay better. Perhaps, there are small corruptions going on that the government isn't touching/benefiting from whereby the Cobalt is sold for a price that doesn't reach the miners.
At the same time, I imagine that the mentions companies help fund research for alternative batteries that do not require Cobalt.
Of course, I'm making all of this up, but I'm sure these debates happen all the time among those involved.