It’s not. It’s actually very easy.
You just keep adding batteries until you hit that range.
The issue is that then the car is heavy, has poor interior space, is expensive, and will take a long time to charge.
Battery technology is slowly, but steadily, advancing such that power density (amount of power per volume of battery), specific power (amount of power per lb/kg of battery) and charging rates are making it easier.
For instance, at least one company (Amprius) is actually producing batteries with the anode material made out of silicon instead of carbon. The batteries are lighter and smaller for the same amount if power, and they can be charged/discharged much more quickly. They’re going into “high demand” applications first (read: aircraft), but it’s only a matter of time before they end up in ground vehicles.
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