Chinese firms currently produce the vast majority of electric car batteries and the minerals used in them. But US politicians have cast over-reliance on Chinese manufacturers as an economic and security risk. The US has unveiled rules aimed at keeping Chinese components out of electric cars sold in the country. The restrictions are tied to government incentives for electric cars made in America. The hotly-debated limits are intended to help build up the industry in America, but critics say they could slow adoption of electric cars. Will USA succeed in this ?

