This former Tesla engineer designed a battery that could make a $25K EV possible

Bedrock Materials is making sodium-ion batteries, which will make EVs more affordable—and less environmentally destructive. Lithium-ion battery prices have dropped nearly 90% since 2008, the year that Tesla released its first electric car. Since batteries are the most expensive part of an EV, that’s a big part of the reason that the cars are finally getting close to price parity with gas cars. But lithium prices are volatile, and batteries are still relatively expensive. To help make...