Not for solar, and not for most forms of Li-ion batteries.
You need them for solar inverters, but you also need them for the turbines like those used to generate power with geothermal/wind/hydro/nuclear/etc.
Erbium perhaps for some power semiconductors, but in very small amounts.
What's the use in turbines? Most generators associated with turbines don't use permanent magnets.
You need them for solar inverters, but you also need them for the turbines like those used to generate power with geothermal/wind/hydro/nuclear/etc.
Erbium perhaps for some power semiconductors, but in very small amounts.
What's the use in turbines? Most generators associated with turbines don't use permanent magnets.