Surprisingly, it's been nearly two decades since the last major advance in battery technology - the commercialization of the lithium-ion cell. This battery type remains the industry's standard for pure electric vehicles because it can deliver more power over a longer period of time at a lower cost than any competitive technology.
However, for what the automotive industry refers to as High Efficiency Vehicles (HEVs) - a.k.a. conventional hybrids - a new battery technology is on the horizon that will make these vehicles less costly, less weighty, and more green (in terms of battery-pack recyclablility).
The new technology comes from the California company PowerGenix. The company holds twenty-three patents (granted and pending) on nickel-zinc batteries. The base formulation for NiZn batteries isn't new (Thomas Edison attempted but gave up on making the formulation work), but as PowerGenix CEO Dan Squiller notes, "What the engineers and chemists at PowerGenix discovered was how to make the elements play nice together and last for an extended period of time while charging and discharging."
Currently, HEVs use nickel-metal-hydride (NiMH) batteries. The new NiZn formulation packs 30 percent more power into a package that weighs 30 percent less than NiMH power cells. Moreover, the PowerGenix cells cost 20 percent less and are, according to Squiller, "inherently more recyclable than any other rechargeable battery chemistry commercially available today," partly because NiZn batteries don't require electrode stabilizers. PowerGenix has retrofitted a Toyota Prius with its batteries, reporting solid results from the lightened Toyota.
In spite of this success, don't look for PowerGenix brand batteries to be on sale at your local Radio Shack or under the hood of a Prius anytime soon. Although the company already manufactures its NiZn cells for use in power tools, electric scooters, electric bikes, and for companies selling rechargeable AA and AAA batteries, PowerGenix has opted not to create a brand name for its batteries (the company doesn't want to take on the big-spending bunny). Regarding automotive applications, PowerGenix plans to license its technology.
According to Squiller, the company's batteries will be used in automotive applications (HEVs) in the foreseeable future but probably not sooner than 2011 models. "We expect that HEVs will become a standard of sorts in the next few years," Squiller said, referencing the expansion of the "auto stop" feature on vehicles with standard internal-combustion engines. "These vehicles represent the perfect application of nickel-zinc battery technology, because they need bursts of power for short durations, and this is something that our batteries do very well."