Current mass-produced hybrid cars use nickel-metal hydride batteries, but Mercedes-Benz says it will launch the first hybrid with lithium ion batteries. Lithium ion batteries are more efficient than nickel-metal hydride batteries and have a better weight-to-power ratio, and are used in the all-electric Tesla roadster as well as in many plug-in hybrid conversions. But large stacks of lithium ion batteries can overheat, a serious problem in an automotive application. Mercedes-Benz announced it has 25 patents around making lithium ion suitable for cars, detailing a key breakthrough of integrating the battery with a car's climate control system, which maintains the … Read more