Tuesday, September 16, 2014
Tesla CEO I’d Bet On Capacitors Over Batteries
Tesla’s CEO Elon Musk says he bets that it could be capacitors — rather than batteries — that deliver an important breakthrough for electric transportation. “If I were to make a prediction, I’d think there’s a good chance that it is not batteries. But capacitors,” said Musk at the Cleantech Forum in San Francisco on Wednesday.
Capacitors, or ultracapacitors, are energy storage devices that can deliver quick bursts of intense power and can withstand more charge and discharge cycles than batteries. They’re like batteries, and can be used in complement with batteries.
But it’s interesting that the CEO of a company that bases its technology around standardized, small format, lithium-ion batteries would make such a comment. Perhaps Tesla is doing some R&D on capacitor storage deep in its Palo Alto, Calif. labs?
The original reason Musk came out to California years ago was to do research on advanced, high energy density capacitors at Stanford, and to try to leverage what Musk said was tens of billions of dollars of R&D that’s been applied to capacitors for advanced ship making. But then, that whole Internet thing and PayPal happened. And then Tesla (and SolarCity and SpaceX).
Musk says he’s optimistic there will be a solution found by one or another companies in the capacitor space that “will supercede,” batteries. The capacitor companies I’ve written about include Ioxus, which makes ultracapacitors for transportation in complement with batteries; EEstor, which seems like it’s not ever going to deliver anything; Recapping, which is backed by Khosla Ventures and won an ARPA-E grant; and EnerG2, which makes materials for ultracapacitor makers.
Thursday, September 11, 2014
Forget Battery Swapping Tesla Aims to Charge Electric Cars in Five Minutes
Electric vehicles take too long to recharge. To charge a Tesla Model S just halfway takes five hours at a typical home or public charging station. But in its effort to make electric vehicles more practical, Tesla Motors is quickly reducing the charging times. Last September, it unveiled a network of “supercharging” stations—designed exclusively for its Model S and future electric vehicles—that could charge a battery halfway in 30 minutes. In May, it announced an upgrade that cut that time to 20 minutes. Now Tesla’s chief technology officer, JB Straubel, says the company eventually could cut the time it takes to fully charge the battery to just five minutes—or not much longer than it takes to fill a gas tank.Straubel isn’t referring to the battery swap technology Tesla recently unveiled (see “Why Tesla Thinks It Can Make Battery Swapping Work”). That system doesn’t charge batteries quickly. It simply takes out a depleted battery and replaces it with a fully charged one. He’s talking about what might be a more appealing option for drivers: recharging the battery in your car while you wait.
“It’s not going to happen in a year from now. It’s going to be hard. But I think we can get down to five to 10 minutes,” Straubel said in an interview with MIT Technology Review. He noted that the current superchargers, which deliver 120 kilowatts of electricity, “seemed pretty crazy even 10 years ago.” Conventional public charging stations deliver well under 10 kilowatts.
