GM engineers altered the lithium-ion battery packs chemistry to improve performance

The Chevrolet Volt, everyone's favorite "green" whipping boy, is getting a range boost for the 2013 model year. General Motors announced today that the battery-only range of the Volt would increase from 35 miles to 38 miles. The total driving range of the 2013 Volt including extended range operation (which taps into the gasoline engine/generator) now stands at 380 miles.
The miles per gallon equivalent (MPGe) increases from 94 MPGe to 98 MPGe.
GM says that it was able to improve battery performance of the Volt by altering the chemical composition of the battery and upping total battery storage capacity from 16 kWh to 16.5 kWh.

2013 Chevrolt Volt [Image Source: GM]
“The best way to explain what we’ve done at the cell level is to compare it to a cake batter recipe.  Sometimes if you use more sugar and less vanilla you get a better tasting cake. We’ve done some work at the cell level to modify the ‘ingredients’ to make a better end result,” said Bill Wallace, GM's director of Global Battery Systems Engineering. “This attention to detail will allow our customers to experience more pure EV range, which is the true benefit of owning a Volt.”
Yesterday, Honda announced that its lease-only Fit EV has a battery range of 82 miles and is rated at 118 MPGe.

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