Electric cars, and for that matter hybrids, have been marketed in no small part on the good karma you accrue for owning one. “Buy an electric car and save the world!” But just how smug should those Tesla and other EV drivers be? I wanted to find out. And the answers just may take Tesla, Volt and Leaf owners down a notch.
In the last year, a number of important studies tracking the environmental cost of EVs, and particularly lithium-ion batteries, have come out. What these studies have shown is that the environmental gap between internal combustion and electric power is not as wide as we want it to be, and that, regardless of carbon footprint, the process of making lithium-ion batteries leaves a lot to be desired.
Where did that battery come from?
Carl Sagan is famed for saying, “We live in a society exquisitely dependent on science and technology, in which hardly anyone knows about science and technology.” He could have been talking directly about lithium-ion batteries. Chances are you are sitting within three feet of something that uses lithium-ion technology, heck you are probably reading these words thanks to lithium-ion batteries. Yet, not that many people really understand what goes into them.
So how do they work? Like any battery, lithium-ions work by creating a flow of current (electrons) between a positively charged (missing electrons) cathode and a negatively charged anode (extra electrons), through a conductive electrolyte. Lithium makes a great battery because it is both very conductive, making it a good electrolyte, allows for extremely high electrical potential. And of course, because this electrochemical reaction is reversible, the batteries are readily rechargeable.
As great as lithium is for batteries, it has a dark side as well: The stuff is downright nasty. Lithium is flammable and highly reactive, as anyone who has seen photos of burning a Tesla can attest, but that’s the least of our worries. The EPA has linked the use of extremely powerful solvents in the creation of lithium electrolytes and cathodes to everything from cancer to neurological problems. Specifically, the cobalt used in the creation of the most energy dense lithium-ion batteries is poisonous and extremely carcinogenic. Pulmonary, neurological, and respiratory problems have all been connected to cobalt exposure.
A good rule of thumb is that any industrial process that makes liberal use of the word ‘slurry’ is not good for pandas, or for that matter people. And, boy, does slurry come up a lot in the battery-making process.
Other combinations of lithium are not as bad, but none is exactly good. The lithium-iron phosphate used in lower energy density batteries is better in terms of its carcinogenic effect, but might be worse in terms of the impact on the biosphere.
Is it getting hot in here?
Clearly then, EVs and plug-in hybrids have environmental costs. What effects however, do lithium-ion batteries have on John Q. Polar Bear? Well, a recent study from Norway looked at the global-warming potential of the complete lifecycle of EVs, from mining to recycling. Previous studies hadn’t accounted for the energy-intensive process of building EVs, and missed the point: They’re not that much better than gasoline cars.
The best outcome for EVs was a 24-percent improvement in global-warming potential over the average gas powered car, and between 10 percent and 14 percent over diesel. These numbers are nothing to sneeze at, but they change radically depending on the source of electricity that EVs are powered on.
EVs that depend on coal for their electricity are actually 17 percent to 27 percent worse than diesel or gas engines.
The global warming potential for EVs that rely on natural gas – generally considered to be the cleanest fossil fuel – show an improvement of only 12 percent over gasoline, and break even with diesel.
Most alarming, EVs that depend on coal for their electricity are actually 17 percent to 27 percent worse than diesel or gas engines. That is especially bad for the United States, because we derive close to 45 percent of our electricity from coal. In states like Texas, Pennsylvania, and Ohio, that number is much closer to 100 percent. That’s right folks; for residents of some of the most populous states, buying an EV is not only toxic, it’s warming the planet more than its gas-powered counterparts.
With cars that supposedly generate “zero tailpipe emissions,” how are these pollution numbers even possible? The simple answer is that as well as being messy to produce; battery production requires a tremendous amount of electricity. The initial production of the vehicle and the batteries together make up something like 40 percent of the total carbon footprint of an EV – nearly double that of an equivalent gasoline-powered vehicle.
The high initial carbon footprint of an EV can be offset when the car is powered by environmentally friendly energy sources like hydroelectric or wind. Unfortunately, when that same EV is powered by electricity generated from fossil fuels, the initial energy cost of EV production can’t be overcome and outweighs gasoline and diesel-powered vehicles.
Previous studies evaluating EVs have overlooked the high energy cost of production, and have focused on the fact that even coal-fired power generation is technically more efficient than internal combustion. But with a carbon footprint from production something like twice that of an ordinary car, an EV needs to be more than “a little” more efficient to make up for all the carbon it generated before it even rolled off the assembly line.
“No war for oil! Err, lithium!”
There are also some geopolitical concerns surrounding the switch from gasoline-powered vehicles to EVs, too. One of the selling points of EVs is that they allow us end our dependence on foreign oil and big oil companies. In fact, however, we might just be trading “big oil” in for “big lithium.”
Your Tesla may look sleek and clean on the outside, but you owe it to everyone to know the real cost.
As for getting rid of our dependence on foreign material, well … lithium isn’t quite rare, but deposits worth mining are. And, unfortunately for the United States and Europe, the big lithium deposits are in countries like Bolivia, China, and – drum roll please – Afghanistan. None of those countries has a sterling environmental track record.
Given the very real concerns about pollution from battery production, most of which takes place in China, this starts to matter a great deal. Especially when there is so much pressure to keep the prices of batteries down.
Conclusions
So what to make of all this?
Some of you have probably concluded that I hate EVs and don’t think anyone should buy them. That’s not the case. I believe electric vehicles – in one form or another – are likely the future of personal transportation.
But beneath their squeaky clean marketing, EVs are not a panacea, a solution or remedy for all environmental woes. As with any new technology, EVs bring an immense set of new problems; problems we should understand before we become irreversibly tied to the new technology.
Here’s what I suggest: If you are interested in an EV, you should know where your electricity comes from before you sign on the dotted line. If you live in a state with a high dependence on coal, an EV may not be the eco-friendly choice for you.
Ultimately, we can’t let EV-derived smugness get in the way of a real and serious conversation that needs to be had surrounding global warming and the effect energy consumption has on our planet.
Your Tesla may look sleek and clean on the outside, but you owe it to everyone to know the real cost.
