Roll-to-roll production of spray coated N-doped carbon nanotube electrodes for supercapacitors

KARAKAYA M. , Zhu J., Raghavendra A. J. , Podila R., Parler S. G. , Kaplan J. P. , ...Daha Fazla

APPLIED PHYSICS LETTERS, cilt.105, sa.26, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 105 Konu: 26
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1063/1.4905153


Although carbon nanomaterials are being increasingly used in energy storage, there has been a lack of inexpensive, continuous, and scalable synthesis methods. Here, we present a scalable roll-to-roll (R2R) spray coating process for synthesizing randomly oriented multi-walled carbon nanotubes electrodes on Al foils. The coin and jellyroll type supercapacitors comprised such electrodes yield high power densities (similar to 700 mW/cm(3)) and energy densities (1 mW h/cm(3)) on par with Li-ion thin film batteries. These devices exhibit excellent cycle stability with no loss in performance over more than a thousand cycles. Our cost analysis shows that the R2R spray coating process can produce supercapacitors with 10 times the energy density of conventional activated carbon devices at similar to 17% lower cost. (C) 2014 AIP Publishing LLC.