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Hybrid Energy Storage Devices based on Multifunctional Nanocomposite Materials

Subcategory (under Clean Energy): Storage
Technology Readiness Level (TRL): TRL 4 - Early prototype
Technology Outline (Process Description)

Design and fabrication of a sodium ion hybrid capacitor with novel pseudocapacitive layered sodium titanium oxide hydroxide Na2Ti2O4(OH)2 (Na-TOH) material as the anode and highly porous carbon material derived from coconut shell as cathode is demonstrated. The layered Na-TOH synthesized through hydrothermal method showed excellent electrochemical properties. Based on the electrochemical performance and taking into account of the cost factor, we fabricated prototype full cell Sodium hybrid ion capacitor devices and demonstrated their proof-of-concept working. A fully working pouch cell sodium ion capacitor device has been fabricated with Na2Ti2O4(OH)2 as anode and coconut shell derived activated porous carbon as cathode.

Salient Features/Advantages

  • The prototype device exhibited excellent electrochemical characteristics. A pouch cell working device has been fabricated with PVdF HFP gel electrolyte and its proof of concept has been demonstrated by lighting a bunch of LEDs (Fig. 1). Further, we fabricated a fully flexible device which could be operated in a moldable state (Fig. 1). Electrochemical measurements on the fabricated device have been carried out. A higher energy density of 65 Wh kg-1 is obtained at a power density of 500 W kg-1 and even at 5 kW kg-1, the cell showed an energy density of ~ 21 Wh kg-1. Na-TOH/Porous Carbon hybrid Na-ion capacitor exhibited superior performance at high rates, which is one of the essential requirements for HEV applications

Key Outcomes

  • Layered sodium titanium oxide hydroxide Na2Ti2O4(OH)2 exhibited excellent electrochemical properties as anode for Na-ion hybrid capacitor
  • Based on the electrochemical performances and cost factor, Na2Ti2O4(OH)2 material has been identified as optimized anode material for the fabrication of full cell hybrid ion capacitor device
  • Flexible electrodes and the flexible gel electrolytes have been developed for the fabrication of flexible hybrid ion capacitor
  • Designed and fabricated fully moldable hybrid sodium ion capacitor prototype and demonstrated proof-of-concept working of the device

IP Protection details

  • Patent filed (Title, national/International): Nil
  • Patents Granted: Nil
  • Copyrights obtained /progress on commercialisation /Pl. specify connect with industry: Nil

Contact details (for more information)

  • Nodal Person name: Prof. M. M. Shaijumon
  • Email ID: shaiju@iisertvm.ac.in
  • Organisation name (Relevant link/web page): IISER Thiruvananthapuram 
Supporting Photographs/Images

Organizations involved in the development (logo/name)

Indian Institute of Science Education & Research Thiruvananthapuram

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