Nickel = greater volume consumed, but readily available Cobalt =...

Nickel = greater volume consumed, but readily available
Cobalt = undersupply until who knows when

Compare USGS data:
2016 nickel prod: 2,250Kt, total known world reserves: 78,000Kt.
2016 cobalt prod: 123Kt, total known world reserves: 7,000Kt.

Bloomberg est. 190Kt nickel for batteries by 2030 = +8%
and 90Kt cobalt = +73%

That estimate is conservative imo, some have suggested as high as 300Kt cobalt per annum is needed by 2030.

So while more nickel is needed, the demand makes far less an impact on that commodity. Cobalt, on the other hand, needs to ramp up world supply by x2 to stabilize prices.