On Monday, Toyota pledged that ?by around 2025? every new Toyota or Lexus model vehicle will have an electrified version, whether it be a hybrid electric, a plug-in hybrid electric, or a battery electric version.

The Japanese automaker also said that it is updating its sales goals to target selling 5.5 million electrified vehicles annually by 2030, including more than one-million zero-emissions vehicles (that is, battery electric and hydrogen fuel cell vehicles) annually. Toyota reportedly sold 1.4 million hybrid electric vehicles (HEVs) in 2016.

Toyota has had success with its line of fuel-efficient hybrids for 20 years, but, for a while, the company was tepid about the future of full battery-electric models and seemed to favor a future of fuel cell electric vehicles (FCEV). Toyota has argued that running a car exclusively on battery power adds extra weight to the vehicle and creates concern among customers about range. Instead, Toyota argued, FCEVs were easily refuel-able. Hydrogen fuel can fill a tank as quickly as gas can, and FCEVs have a range similar to traditional internal combustion vehicles. In addition to marketing the Toyota Mirai passenger vehicle, the company began testing a long-haul fuel-cell semi at the Port of Long Beach as of April. In February, Toyota partnered with Shell to explore building seven hydrogen refueling centers in California.

But hydrogen has its own problems. It's difficult to store, often requiring compression and very low storage temperatures. And, although several years ago hydrogen refueling centers were rare and so were electric vehicle charging stations, electric charging stations have multiplied dramatically. These days, it seems battery electric vehicles (BEVs) are the more accessible future technology.

Fortunately, the automaker?s significant R&D resources allowed it to continue battery research as well as fuel cell research. The company has been working on solid-state battery technology for a few years now, and in its Monday press release, Toyota confirmed that it hoped to bring cars with solid-state batteries to market by the early 2020s. Solid-state batteries have solid electrodes and electrolytes, and they're theoretically smaller and lighter than their traditional lithium-ion counter parts. Other benefits of solid-state batteries include reduced fire risk and the ability to work in a wider variety of temperatures.