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High energy density double layer energy storage devices

  • US 5,905,629 A
  • Filed: 07/23/1997
  • Issued: 05/18/1999
  • Est. Priority Date: 09/28/1995
  • Status: Expired due to Term
First Claim
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1. A double layer energy storage cell with improved energy density, said cell comprising a pair of electrodes wherein at least one of said electrodes being a carbon paste electrode, a porous ionically conductive separator, and an ion insulating collector, the improvement wherein said carbon paste electrode comprises an activated lignocellulosic-based carbon having a pore volume of greater than about 0.45 cc/g, a median pore width of less than 2.0 nm, a specific surface area of greater than about 500 m2 /g, and a micropore content, based on the total particle volume of the activated carbon, of greater than about 75%.

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