Ultium Cells, a joint venture between General Motors and LG Energy Solution, said Monday it's upgrading its facility in Spring Hill, Tennessee, to make low-cost electric vehicle battery cells. GM said the lithium iron phosphate battery cells — abbreviated LFP based on the elements' chemical symbols — could be significantly cheaper than battery packs used in some EVs, in part because they don't require expensive minerals like cobalt and nickel that are used in standard lithium-ion batteries. "This upgrade at ...