August 2012 Issue
Your Li-ion Future: Promise, But Risk Too
Lithium-ion batteries are coming to aviation, both as main starting batteries and for electric airplanes. But theyll require careful steps to reduce the fire hazard.
For the great wide world of transportation, the lithium-ion battery is the shining city on the hill, that pivotal bit of technology that will have us whizzing around in silent cars banishing the evils of carbon dioxide. For aviation, lithium-ion is both an enigma and an opportunity. To understand both, you need only to grasp three numbers: 50, 150 and 1700. The opportunity part resides in the first two numbersa lead-acid batterys energy density is about 50 Wh/kg, a third or less than that of the typical lithium-ions 150 Wh/kg. Now for the enigma. The 1700 is the Wh/kg energy content of gasoline, adjusted for the typical internal combustion engines 20 percent efficiency. The very best lithium-ion batteries can do at the moment is 400 Wh/kg and these dont exist commercially yet. That means the practical electric airplane may be on the horizon, but its not around the corner.
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