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Thread: Batteries practical and theoretical energy density

  1. #1 Batteries practical and theoretical energy density 
    Forum Professor
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    Apr 2009
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    Aluminum has energy density 31 MJ/Kg and
    83.8 MJ/L vs. gasoline which has energy density 46.4 MJ/Kg and 34.2 MJ/L
    http://en.wikipedia.org/wiki/Energy_density
    what makes aluminum attractive alternative to
    gasoline and especially to hydrogen as energy
    carrier.Efficiency of aluminum-air fuel cells is
    about 80%.However there is great problem
    which lays in difference between theoretical
    energy density of aluminum which is 8000 W-h/Kg and practical energy density of Al-air fuel cells which is 1200 W-h/Kg.
    http://en.wikipedia.org/wiki/Aluminium_battery
    Does anybody know what is making that difference so big?
    I understand that battery
    needs to have container and electrolyte,
    but you need gas tank for gasoline too.
    And how much electrolyte is there?!


    Antislavery
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  3. #2  
    Forum Freshman
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    Sep 2008
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    Maybe something to do with an incomplete reaction of the aluminium?


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  4. #3  
    Forum Ph.D.
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    Jan 2009
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    Possibly the great tendency of Al to form a very stable oxide coating.
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