GM's Akerson promises 200 mile range electric car in a few years
The two key hurdles to electric car adoption are price and driving range. Solving both these issues simply requires battery technology research to increase energy density and lower cost. One of the Silicon Valley battery technology companies, Envia Systems, is doing just that. Yesterday, the Associated Press reported that GM's CEO Dan Akerson spoke at an employees meeting, saying the company is working with Envia Systems on battery technology breakthroughs which would enable electric cars with 100 to 200 miles driving range.
Obviously it is quite possible today to build an electric car with an EPA certified 265 driving range. The Tesla Motors Model S is certified with a 265 mile driving range, and once the Tesla SuperCharger becomes available it will be possible to recharge that car within an hour. The Model S is the first electric car that could be driven on an American-style road trip. This sounds fantastic, until you look at the purchase price of the Model S.
Since the 265 mile driving range electric car already exists (from Tesla Motors), Akerson can only be speaking of a slightly different goal: the affordable 200 mile driving range electric car.
Akerson spoke in March about the possibility of a 140 mile driving range Chevy Volt without explicitly mentioning Envia Systems. In early 2011 GM Ventures invested in Envia Systems, to give the company access to Envia's advances in lithium battery technology. Envia is a licensee to "advanced lithium-ion cathode technology that delivers higher cell energy density and lower cost," technology that both GM and LG Chem has also licensed.
The AP report quotes Akerson telling GM employees "I think we've got better than a 50-50 chance to develop a car that will go to 200 miles on a charge. That would be a game changer."
Indeed, in February Envia Systems announced technology developments the company believes will give twice the energy density at 1/4 the cost of current lithium ion batteries.
Assuming the technology development is successful (not all research projects work out) GM has two choices. One is to build a 35 mile electric range gasoline range extended car, the Chevy Volt, at a much lower price. The other choice is to build the 200 mile driving range electric car, at the price level of today's Volt or Leaf.
Envia is targeting a 400 Watt-hour/kilogram energy density at the cost of $125 per kiloWatt-hour. The technology combination is a silicon-carbon nano-composite anode, a high voltage electrolyte (up to 5.2 volts per cell or so), the company's High Capacity Manganese Rich (HCMR) cathode. The company claims over 1000 charge cycles to 100% depth of discharge, meaning total battery pack lifetime will be extremely long, as well as strong safety characteristics.