by L E Carmichael
Every battery has the same basic components: the anode (negative electrode); the cathode (positive electrode); and the electrolyte. There's also a separator, which prevents electrons from traveling directly from anode to cathode within the battery chamber. Instead, they exit through a wire, traveling through a lightbulb or electric motor before re-entering the battery. According to legend, when Raymond Gaston Planté invented the first battery in 1860, he used a separator made from his wife's petticoat!
As a power source for electric vehicles, however, early batteries had some problems. Because the electrolytes were liquid, they sometimes froze in cold weather (a problem Canadian drivers still struggle with!). Hot weather was just as bad, because the water portion of the electrolyte evaporated. This meant drivers had to "top up" their batteries on a regular basis. Charles Duryea (whose gas-powered cars lost to Andrew Riker in the 1896 race) once told The Horseless Age that “A set of batteries [is] worse to take care of than a hospital full of sick dogs.”
Changes to battery housings have addressed a lot of these problems, as did the invention of the block heater! Today's gasoline-powered cars still use Planté's lead-acid batteries as starting batteries, and they were the energy source of choice for hybrids and electrics for decades. After all, lead-acid batteries are cheap and durable. However, there's not a lot of power relative to weight. To address this problem, scientists had to tackle the guts of the battery - the chemical reactions that produced the flow of electrons.
One alternative chemistry that seemed promising involved replacing lead with another metal, nickel. Nickel-cadmium batteries (NiCAD) had better energy density, which meant vehicles could be driven farther and faster before having to be recharged. However, NiCAD batteries are highly toxic and difficult to recycle. They also have what's known as memory: if NiCADs are repeatedly discharged half-way, then recharged, they eventually "remember" this partial state of charge. As a result, the battery's full capacity can no longer be used.
Nickel metal hydride (NiMH) batteries are less toxic and less prone to memory issues. However, they're also more expensive and take longer to recharge. Before alternative vehicles could really start competing with gas-guzzlers, a completely new battery would have to be invented. But the key breakthrough had nothing to do with cars, and everything to do with portable electronics.
Stay tuned for the final installment - From Cell Phones to Sports Cars!
For more information on battery chemistry, check out Battery University.