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A startup called CalBattery is touting that their silicon-graphene anodes for li-ion batteries "will improve the anode specific capacity performance of lithium battery anodes by a factor of 3X."

Will a 3X improvement in anode performance translate into a 3X improvement in energy density of the overall battery, or not? (In other words, is battery energy density anode-limited?)

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    \$\begingroup\$ oh i went to a seminar on this but i cant remember which! \$\endgroup\$
    – geometrikal
    Commented Oct 31, 2012 at 8:54

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No, energy density of a battery is not anode-limited. Yes, there will be improvement, but not a 3X energy density increase.

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  • \$\begingroup\$ Thanks! Ballpark, what would you guess the energy density increase would be? And what resources would you suggest I use to figure out what the increase would be? \$\endgroup\$
    – AlcubierreDrive
    Commented Oct 31, 2012 at 12:00
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    \$\begingroup\$ Battery design is a pretty involved black art, and my own knowledge is peripheral at best. Hnece not really qualified to "guess" at the energy density increase. What I can say for certain, though, is that the increase would vary across battery sizes, electrode dimensions, and temperature... and probably a whole bunch of other factors. \$\endgroup\$
    – Anindo Ghosh
    Commented Oct 31, 2012 at 15:08

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