• Studies on 12 V substrate-integrated lead-carbon hybrid ultracapacitors

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    • Keywords


      Hybrid-ultracapacitor; flexible-graphite; poly-aniline; cost-effective ultracapacitor.

    • Abstract


      A cost-effective 12 V substrate-integrated lead-carbon hybrid ultracapacitor is developed and performance tested. These hybrid ultracapacitors employ flexible-graphite sheets as negative plate currentcollectors that are coated amperometrically with a thin layer of conducting polymer, namely poly-aniline to provide good adhesivity to activated-carbon layer. The positive plate of the hybrid ultracapacitors comprise conventional lead-sheet that is converted electrochemically into a substrate-integrated lead-dioxide electrode. 12 V substrate-integrated lead-carbon hybrid ultracapacitors both in absorbent-glass-mat and polymeric silicagel electrolyte configurations are fabricated and characterized. It is possible to realize 12 V configurations with capacitance values of ∼200 F and ∼300 F, energy densities of ∼1.9 Wh kg$^{−1}$ and ∼2.5 Wh kg$^{−1}$ and power densities of ∼2 kW kg$^{−1}$ and ∼0.8 kW kg$^{−1}$, respectively, having faradaic-efficiency values of ∼90 % with cycle-life in excess of 100,000 cycles. The effective cost of the mentioned hybrid ultracapacitors is estimated to be about ∼4 US$/Wh as compared to ∼20 US$/Wh for commercially available ultracapacitors.

    • Author Affiliations


      A Banerjee1 A K Shukla1

      1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
    • Dates

  • Journal of Chemical Sciences | News

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