Navigation Links
Drexel expert: Efficiency metrics for energy storage devices need standardization

PHILADELPHIA -- Solving the mystery of prematurely dead cell phone and laptop batteries may prove to be a vital step toward creating a sustainable energy grid according to Drexel researcher Dr. Yury Gogotsi. In a piece published in the November 18 edition of Science, Gogotsi, who is the head of the A.J. Drexel Nanotechnology Institute, calls for a new, standardized gauge of performance measurement for energy storage devices that are as small as those used in cell phones to as large as those used in the national energy grid.

Gogotsi is one of the featured experts, along with Bill Gates, tapped by Science to address problems that must be solved en route to the widespread use of renewable energy. His piece, co-authored with Dr. Patrice Simon of the Universit Paul Sabatier in Toulouse, France, is entitled "True Performance Metrics in Electrochemical Energy Storage."

"A dramatic expansion of research in the area of electrochemical energy storage has occurred over the past due to an ever increasing variety of handheld electronic devices that we all use," Gogotsi said. "This has expanded use of electrical energy in transportation, and the need to store renewable energy efficiently at the grid level. This process has been accompanied by the chase for glory with the arrival of new materials and technologies that leads to unrealistic expectations for batteries and supercapacitors and may hurt the entire energy storage field."

The main type of energy storage device addressed in the article is the supercapacitor. Supercapacators, which are built from relatively inexpensive natural materials such as carbon, aluminum and polymers, are found in devices, ranging from mobile phones and laptop batteries to trams, buses and solar cells. While supercapacitors tend to store less energy compared to standard lithium-ion batteries, they have the ability to charge and discharge energy more quickly than batteries and can be recharged a near infinite number of times, and operate in a wider temperature range with a high efficiency.

Typically, the performance of both, batteries and supercapacitors, is presented using Ragone plots, graphs that show a relation between the energy density and the power density. For example, a Rangone plot for the battery used in an electric car shows both how far it can travel on a single charge energy density- and how fast the car can travel power density. An ideal energy storage device is expected to store plenty of energy and do it quickly.

The issue that Gogotsi and Simon bring to light is the idea that current metrics for grading energy storage devices, including the Ragone plot, may not provide a complete picture of the devices' capability. According to the researchers, other metrics, such as a device's cycle lifetime, energy efficiency, self-discharge, temperature range of operation and cost, must also be reported.

"This paper calls upon the community of scientists and engineers who work on supercapacitors to present data on material performance using metrics beyond the traditional Ragone plot," Simon said. "Although such plots are useful for comparing fully packaged commercial devices, they might predict unrealistic performance for packaged cells from extrapolation of small amounts of materials."

Contact: Britt Faulstick
Drexel University

Related biology technology :

1. How to produce flexible CIGS solar cells with record efficiency
2. Nano Gold Rush: Researchers use tiny gold particles to boost organic solar cell efficiency
3. With a simple coating, nanowires show a dramatic increase in efficiency and sensitivity
4. Magnetic memory and logic could achieve ultimate energy efficiency
5. Nanoparticles improve solar collection efficiency
6. Novel nanowires boost fuel cell efficiency
7. Ultrafast laser scribing technique to cut cost, hike efficiency of solar cells
8. Tecnalia leads the integration of energy efficiency in sports facilities
9. University of Minnesota researchers clear major hurdle in road to high-efficiency solar cells
10. Challenge President to Adopt Energy Measure with Double the Impact of Improved Auto Fuel Efficiency Standards at Fraction of the Cost
11. Elsevier Addresses Todays Healthcare Information Crisis With a Renewed Focus on Improving Quality and Efficiency
Post Your Comments:
(Date:12/1/2015)... , Dec. 1, 2015 Researchers at the ... Institute for Brain Research at MIT have engineered changes ... cut down on "off-target" editing errors. The refined technique ... use of genome editing. Science , ... three of the approximately 1,400 amino acids that make ...
(Date:12/1/2015)... , Dec. 1, 2015 Frost & ... program. This program addresses ways companies can innovate ... --> ... --> ... healthcare, as well as the disrupting factors altering ...
(Date:12/1/2015)... Minn. , Dec. 1, 2015  The Minnesota ... recipient of the 2015 Tekne Award in the Small ... at the Minneapolis Convention ... have played a significant role in developing new technologies ... living around the world. Clostridium difficile ...
(Date:12/1/2015)... , Dec. 1, 2015  CardioCell LLC, a ... stem cells for cardiovascular indications, intends to proceed ... based on recommendations from a Heart Failure Advisory ... Scientific Advisory Board members . In a ... Phase IIa safety and efficacy data from CardioCell,s ...
Breaking Biology Technology:
(Date:11/19/2015)... MOUNTAIN VIEW, Calif. , Nov. 19, 2015 /PRNewswire/ ... authentication market, Frost & Sullivan recognizes BIO-key with the ... Strategy Leadership. Each year, Frost & Sullivan presents this ... comprehensive product line catering to the needs of the ... which the product line meets and expands on customer ...
(Date:11/18/2015)... 18, 2015  As new scientific discoveries deepen our ... other healthcare providers face challenges in better using that ... In addition, as more children continue to survive pediatric ... and old age. John M. Maris, M.D ... of Philadelphia (CHOP) . --> John ...
(Date:11/17/2015)... November 17, 2015 Paris ... --> Paris from 17 th ... the biometrics innovation leader, has invented the first combined scanner ... the same scanning surface. Until now two different scanners were ... scanner can capture both on the same surface. This ...
Breaking Biology News(10 mins):