Rubidium is currently used industrially in fibre optic cables. It also provides exposure as an up and coming battery metal with its use in sodium-ion batteries. Sodium-ion batteries have lower energy density than lithium-ion batteries, are faster to charge and more resilient to cold temperatures.
Nickel & lithium are critical raw-material in the production process of electric vehicle (EV) batteries. Nickel makes batteries energy dense, so that cars can run further on a single charge. lithium is the primary raw-material used in EV batteries. Nickel can also be found in everything from mobile phones to jet engines.