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Carbon Nanotube Supercapacitors

Organization:National University of Singapore, Singapore, SG
I.P. Brief:The invention (IP) is about a novel structure of carbon nanotubes (CNT) which exhibits supercapacitance. Capacitance of these CNTs is much higher than the state-of-the-art CNTs as well as supercapacitor materials like carbon aerogel. The novel nanotubes of this invention exhibit a capacitance as high as 406 F/g.
Summary of I.P.:The technology addresses problems associated with energy storage. It provides a new material, comprising novel structures of carbon nanotubes (tubes-in-tube), which possesses very high capacitance values. The technology also provides a method to prepare and control the novel structures. The new CNT material is ideal for use in many electrical appliances, such as the hybrid power sources for electrical energy, digital telecommunication systems, uninterruptible power supply (UPS), and pulse laser technique. Battery companies are the most immediate customers for this technology. This technology could be considered as a “replacement technology” which hold the potential to replace state-of-the-art capacitor/supercapacitors materials.
Patent:US provisional application filed (awaiting particulars)
Keywords:supercapacitor, carbon nanotube, battery, hybrid power source
Primary Industry:Energy
Specific Market:batteries, hybrid power sources, electrochemical capacitors, energy storage devices
Market Size:Battery market - $48 Billion Carbon nanotube - $5 Billion (by 2010)
State of the Art:Presently, a variety of electrode materials (conducting polymers, oxides, CNTs) are used in electrochemical capacitors. For use in energy storage devices, these materials are required to possess ‘high specific power’ and ‘long-durability’. Our material is superior in these qualities over the state-of-the-art materials.
Competition:Supercapacitors is a active research area. Any material with comparable capacitance and cheaper cost would be a threat. Currently, we are not aware of any material that could pose a threat.
Figures of Merit:- Significantly high capacitance (nearly 2 times) compared to state-of-the-art - Cheaper material (compared to state-of-art) - Simple process of manufacture / easy scale-up
Tech.  Obstacles:- Further reduction of cost for widescale (low end) applications
Market Obstacles:(i) To produce tubes-in-tube carbon nanotubes in large scale at low cost (ii) To prepare supercapacitors with our carbon materials (iii) To optimize the structure of our carbon materials for high performance (iv) To optimize fabrication procedures (v) To market the products
Patent Landscape:1. US 6,333,016 “Method of producing carbon nanotubes”, the board of regents of the university of Oklahoma 2. US 6,858,197 “Controlled patterning and growth of single wall & multi-wall carbon nanotubes” NASA 3. US 2003/0175200 “catalytic growth of single-wall carbon nanotubes from metal particles”, William marsh rice university 4. US 2004/0131937 “Lithium ion battery comprising nanomaterials.”, Chen & Leu Note: The above patents only represents state-of-the art. They do not hinder freedom of operation of our invention.
Publications:[1] B. E. Conway, Electrochemical supercapacitors: scientific fundamentals and technological applications, New York: Kluwer Academic/Plenum, 1999. [2] K. H. Chang, C. C. Hu, Electrochem. & Solid state Lett. 7, A466 (2004). [3] C. Niu, E. K. Sichel, R. Hoch, D. Moy, H. Tennent, Appl. Phys. Lett. 70, 1480 (1997). [4] K. H. An, W. S. Kim, Y. S. Park, Y. C. Choi, S. M. Lee, D. C. Chung, D. J. Bae, S. C. Lim, Y. H. Lee, Adv. Mater. 13, 497 (2001). [5] J. Y. Lee, K. H. An, J. K. Heo, Y. H. Lee, J. Phys. Chem. B 107, 8812 (2003).
Research Team:(i) Professor Lin Jianyi 25 years research experience (ii) Professor Feng Yuan Ping 25 years research experience (iii) Mr Pan Hui (PhD candidate) 6 years research experience


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