Sony is planning to commercialize lithium-sulfur batteries by 2020, and promising increases of up to 40% over conventional lithium-ion architectures. The devil is in the details, but a battery with 40% more specific energy at the same weight and cost as lithium-ion would enable EVs at lower price points.
from ExtremeTech http://www.extremetech.com/electronics/219729-sony-plans-to-boost-battery-performance-40-percent-by-2020
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