Miscellaneous/Supercapacitors 031031






Miscellaneous/Supercapacitors
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 (Oct. 2003) Gold is studied as a replacement for carbon in ultracapacitors.  Professor Michael Cortie of the University of Technology, Sydney and Dr. Elma van der Lingen from Mintek in Jahannesburg are finding that the ‘gold’ ultra-capacitors did not over heat and could store up to six times the energy of standard capacitors.  Gold does not suffer from the high internal resistance that limits carbon-based ultracapacitors.  

In working with their prototype, the researches used an intermetallic compound of gold and aluminum called purple glory.  The aluminum is them chemically removed, thus leaving a sponge of pure porous gold.  Because of the holes (pores), there is a very large surface area which is utilized  for the rapid exchange of electrical charge.
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Q:What’s the role of the Supercapacitor?
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Shield Ultracapacitor Strings From Overvoltage Yet
Maintain Efficiency
An ultracapacitor connected in series for greater terminal Voltage can suffer damage during charge due to individual cell overvoltage. This story describes the advantages and disadvantages of passive and active Voltage equalization methods to protect each cell in the string.(07-2BD76-13)
ELECTRONIC DESIGN
May 27, 2002, pp.81-85
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T/J Technologies receives $2 million award from U.S. Dept. of Commerce to develop hybrid ultracapcitor/fuel cell power packs for portable electronics. The Company promises to alleviate two key frustrations for users of rechargeable batteries: limited run-time and access to a wall or vehicle outlet for recharging. The hybrid power packs are expected to deliver five times longer run time and be instantly “rechargeable” simply by refueling. (12-01 BD69-12)
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(02-01-02 BD70-9) Ness Capacitor Co. introduces 2.7 Volt ultracapacitors. The company says it is the first ultracapacitor family with continuous operating Voltage rating higher than 2.5 Volts. The NESS 2.7 V ultracapacitor is said to have the highest capacitance and energy storage densities and the lowest Equivalent Series Resistance of any commercially available components of comparable size and weight. The key to performance is attributed to its porous carbon electrodes. Some targeted markets are for EVs’ and hybrid EVs’ acceleration and braking, industrial actuation and control, wind and fuel cell power conversion, and UPS switchover bridging.


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