mobile | classic
Dataweek Electronics & Communications Technology Magazine





Follow us on:
Follow us on Facebook Share via Twitter Share via LinkedIn


Search...

Electronics Buyers' Guide

Electronics Manufacturing & Production Handbook 2017


 

Supercapacitor development improves energy retention
27 May 2009, News

Research into efficient charge storage mechanisms has always been an area of interest to the electronics industry, specifically for application segments such as consumer electronics.

The ability to charge a storage device and maintain the charge over a considerable amount of time have been the two most important performance markers of any charge storage technology.

Over the past decade, supercapacitors have been an area of interest to the research fraternity focusing on development of highly efficient battery technologies. Supercapacitors, or ultracapacitors, are electrochemical capacitors that have an extremely high energy density.

While supercapacitors have made a performance mark through their ability to acquire charge at very high speeds, industrial experts feel that there is still a lot of potential to improve their retention capacity. In the current scenario, even the best of the supercapacitors discharge at a very high rate, restricting their dominance in the industrial space.

In an attempt to improve the retention capability of supercapacitors, a team of researchers from the University of California in Los Angeles has developed a manufacturing process for supercapacitors that is said to improve their retention capacity. The process employs single walled carbon nanotubes (SWCNTs). Nanotubes are considered to have the potential to replace conventionally used silicon in applications such as CPUs, memories and radio circuits, due to their small size and very encouraging electrical characteristics.

Traditional supercapacitors are manufactured in layers with a viscous solution between plates, similar to a capacitor. When a voltage is applied across the two electrodes, the positive ions head very quickly to one electrode, and the negative ones to another, building up a charge. This process helps the supercapacitor to store energy at a faster rate, but doesn’t provide resistance from discharging.

In the new process suggested by the team from UCLA, carbon nanotubes were sprayed onto plastic films and two such films were sandwiched between an electrolyte of a water-soluble synthetic polymer, phosphoric acid and water. As a result, an ultrathin supercapacitor is formed, which is in the order of micrometres. This process prevents the supercapacitor from discharging too quickly.

The current implementation of this manufacturing process yields an equivalent of 70 kilowatts per kilogram of energy (9 watt hours per kilogram) – well below the power available in traditional lithium-ion batteries, due to energy losses seen when discharging the supercapacitor. An unusually high resistance exists when energy is moved into or out of the device.

The team is working on resolving these issues, and this effort is expected to result in super thin capacitors, which can be very large and rectangular, about 1 mm thick, making them suitable for use in extremely thin cellphones and mobile gadgets. As these supercapacitors power devices for an extended time period, they can also be charged via remote magnetic fields that do not require wires. As these carbon nanotube-based supercapacitors have properties such as fast charging, reliability, long-term cycling, and the ability to deliver significantly more power than batteries, they are expected to find application in power saving features in CPUs.

For more information contact Patrick Cairns, Frost & Sullivan, +27 (0)21 680 3274, patrick.cairns@frost.com, www.frost.com


  Share on Facebook Share via Twitter Share via LinkedIn    

Further reading:

  • SA buys R1 billion entrance ticket to fourth industrial revolution
    18 July 2018, This Week's Editor's Pick, News
    Yekani has outgrown its contract manufacturing roots and is fast becoming a major player in the South African OEM market.
  • Minister dismayed at local content in STBs
    18 July 2018, This Week's Editor's Pick, News
    Communications minister, Nomvula Mokonyane, expressed her concern about the lack of adherence to the 30% local content manufacturing rule on the part of some digital TV set-top box suppliers.
  • The impact of localisation on revenue and supply chain
    18 July 2018, Arrow Altech Distribution (AAD), This Week's Editor's Pick, News
    The unforeseen impact of government’s localisation initiative is the need for creative supply chain and inventory management processes that align the time factor of project cash out- and in-flows.
  • From the editor’s desk: Jackson’s left hand rule
    18 July 2018, Technews Publishing, News
    It is strange how sometimes, after first noticing something you hadn’t noticed before, it seems to pop up all over the place. It has been dubbed the Baader-Meinhof phenomenon, and it’s not so much a case ...
  • Electronics news digest
    18 July 2018, News
    South Africa • Würth Elektronik eiSos announced the appointment of NuVision Electronics (pictured) as a new South African distribution partner. “In our joint vision to build strong, service-focused relationships ...
  • RS launches e-commerce website for sub-Saharan Africa
    18 July 2018, RS Components (SA), News
    RS Components was founded as Radiospares in 1937 as a supplier of parts to the burgeoning radio market, and has evolved into a global distribution enterprise with operations in Europe, North America, ...
  • Supercomputing students bring home third prize
    18 July 2018, This Week's Editor's Pick, News
    The South African supercomputing team that participated in the International Student Cluster Competition in Frankfurt, Germany, took third place behind China’s Tsinghua University and Nanyang Technological ...
  • Electronics news digest
    13 June 2018, News
    South Africa • Pasternack, a leading provider of RF, microwave and millimetre-wave products, has signed RF Design of Cape Town as an authorised distributor of Pasternack products in South Africa and ...
  • AAD and Resolution Circle upskill students
    13 June 2018, Arrow Altech Distribution (AAD), This Week's Editor's Pick, News
    Arrow Altech Distribution (AAD) and Resolution Circle launched a joint youth skills development programme that shall see 120 student engineers receive in-service training in cellphone screen and battery repairs.
  • Sierra Wireless hosts ‘Simplifying IoT’ seminars
    13 June 2018, News
    Based around the theme ‘Simplifying IoT,’ Sierra Wireless recently held one-day seminars in Cape Town, Centurion and Durban. Presentations covering a variety of product ranges and topics were delivered ...
  • From the editor’s desk
    13 June 2018, Technews Publishing, News
    After a severe downturn triggered by the global economic collapse a few years ago, the electronics industry has recovered to reach all-time highs. DMASS reported record European semiconductor sales figures ...
  • Win a Microchip in-circuit debugger
    13 June 2018, Technews Publishing, News
    Readers of Dataweek are being offered the chance to win one of Microchip Technology’s MPLAB PICkit 4 in-circuit debuggers. The tool allows fast and easy debugging and programming of PIC and dsPIC Flash ...

 
 
         
Contact:
Technews Publishing (Pty) Ltd
1st Floor, Stabilitas House
265 Kent Ave, Randburg, 2194
South Africa
Publications by Technews
Dataweek Electronics & Communications Technology
Electronic Buyers Guide (EBG)

Hi-Tech Security Solutions
Hi-Tech Security Business Directory

Motion Control in Southern Africa
Motion Control Buyers’ Guide (MCBG)

South African Instrumentation & Control
South African Instrumentation & Control Buyers’ Guide (IBG)
Other
Terms & conditions of use, including privacy policy
PAIA Manual





 

         
    Classic | Mobile

Copyright © Technews Publishing (Pty) Ltd. All rights reserved.