Navigation Links
Better batteries
Date:11/14/2011

is limited in two ways. Its energy capacity -- how long a battery can maintain its charge -- is limited by the charge density, or how many lithium ions can be packed into the anode or cathode. Meanwhile, a battery's charge rate -- the speed at which it recharges -- is limited by another factor: the speed at which the lithium ions can make their way from the electrolyte into the anode.

In current rechargeable batteries, the anode -- made of layer upon layer of carbon-based graphene sheets -- can only accommodate one lithium atom for every six carbon atoms. To increase energy capacity, scientists have previously experimented with replacing the carbon with silicon, as silicon can accommodate much more lithium: four lithium atoms for every silicon atom. However, silicon expands and contracts dramatically in the charging process, causing fragmentation and losing its charge capacity rapidly.

Currently, the speed of a battery's charge rate is hindered by the shape of the graphene sheets: they are extremely thin -- just one carbon atom thick -- but by comparison, very long. During the charging process, a lithium ion must travel all the way to the outer edges of the graphene sheet before entering and coming to rest between the sheets. And because it takes so long for lithium to travel to the middle of the graphene sheet, a sort of ionic traffic jam occurs around the edges of the material.

Now, Kung's research team has combined two techniques to combat both these problems. First, to stabilize the silicon in order to maintain maximum charge capacity, they sandwiched clusters of silicon between the graphene sheets. This allowed for a greater number of lithium atoms in the electrode while utilizing the flexibility of graphene sheets to accommodate the volume changes of silicon during use.

"Now we almost have the best of both worlds," Kung said. "We have much higher energy density because of the silicon, and the sandwiching reduces the capacity
'/>"/>

Contact: Megan Fellman
fellman@northwestern.edu
847-491-3115
Northwestern University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Army can boost mission success by better managing
2. Efavirenz-based initial therapies associated with better outcomes in HIV-infected adults
3. Caltech scientists engineer supersensitive receptor, gain better understanding of dopamine system
4. Better beer: College team creating anticancer brew
5. Building a better bee
6. Men are better at detecting infidelities
7. Sniffing out a better chemical sensor
8. Sibling study could lead to better treatments for inherited form of colon cancer
9. Soybean grant gives researchers tools to unravel better bean
10. EPA and USDA should create new initiative to better monitor nutrients
11. In the animal world, bigger isnt necessarily better
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/30/2014)... Here,s some hope: A new research report published in ... , explains how scientists developed a synthetic version ... embryo development in human and mouse eggs similar to ... cell during fertilization. , "We believe that the results ... our understanding of human fertilization by providing a precise ...
(Date:9/30/2014)... 30, 2014  Spectra Automation, a trusted ... biotech and power generation industries, announced today ... Manager, an easy-to-use and cost-effective data collection, ... development laboratories. Most upstream ... analyzer systems. Accessing and consolidating data from ...
(Date:9/30/2014)... 30, 2014) People who suffer from asthma may ... control their asthma besides properly taking medications and avoiding ... in the Annals of Allergy, Asthma and Immunology ... Allergy, Asthma and Immunology (ACAAI), asthma sufferers can learn ... The woman described in the Annals article improved her ...
Breaking Biology News(10 mins):Synthetic sperm protein raises the chance for successful in vitro fertilization 2Spectra Automation Introduces RECONN Bioprocess Manager 2Asthma symptoms kicking up? Check your exposure to air pollution 2
... A new study, supported in part by the National Heart, ... Health, suggests that a combination of mobile technology and remote ... behavior in adults. The study focused on the best way ... appear Monday, May 28, in the Archives of Internal ...
... A study led by researchers from McGill University provides ... heart a finding that promises to contribute to the ... heart tissue. The research, published in the Proceedings ... the muscle fibers in the heart wall are locally arranged ...
... getting stronger or weaker? Right now, it,s hard to know. ... this medical challenge by developing and applying a technique that ... technique was more sensitive in detecting bone loss than the ... it may find use in clinical settings, and could pave ...
Cached Biology News:NIH-funded study examines use of mobile technology to improve diet and physical activity behavior 2Study provides new insights into structure of heart muscle fibers 2Earlier detection of bone loss may be in future 2Earlier detection of bone loss may be in future 3Earlier detection of bone loss may be in future 4
(Date:9/30/2014)... 30, 2014 CORD:USE Cord Blood Bank – ... it has entered into an Equity and Exclusive Services ... licensed a series of patented technologies for the isolation of ... applications.  Tianhe is performing Phase I/II clinical trials in ... using Tianhe,s Stem Cell Educator Therapy showing ...
(Date:9/30/2014)... (PRWEB) September 30, 2014 ... solutions for drug discovery and related life ... consortium has chosen Genedata Selector as its ... (NGS) data. FUNGITECT is a European consortium ... fungal diseases via individualized anti-fungal drug therapies. ...
(Date:9/30/2014)... , Sept. 30, 2014  KemPharm, Inc., ... discovery and development of proprietary new molecular entity ... Patent and Trademark Office (USPTO) issued U.S. Patent ... entitled, "Benzoic Acid, Benzoic Acid Derivatives and Heteroaryl ... Making and Use Thereof." The patent, ...
(Date:9/30/2014)... , Sept. 30, 2014 FemCap Inc., ... health announces its receipt of a patent No: US, ... cup has also received FDA clearance in the U.S., ... the CE in Europe. This patent is related to its ... this issuance, the company is releasing FemmyCycle Teen, a ...
Breaking Biology Technology:CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 2CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 3CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 4FUNGITECT Consortium Adopts Genedata Selector as Data Analysis Platform for Anti-fungal R 2FUNGITECT Consortium Adopts Genedata Selector as Data Analysis Platform for Anti-fungal R 3KemPharm, Inc. Receives Patent from the USPTO for Novel Prodrug of Hydromorphone, KP511 2The FemmyCycle 2
... Beckman Coulter,Inc. (NYSE: BEC ), a ... automate, and innovate complex biomedical testing,announced today that ... present at the 19th Annual Piper Jaffray Healthcare,Conference ... (ET). (Logo: http://www.newscom.com/cgi-bin/prnh/20031202/BECLOGO ) The ...
... Highlighted by the,introduction of the IQQA(R) Enterprise ... radiology imaging market with its universal enterprise,solution, ... of 2D/3D/4D advanced,clinical applications on existing PACS ... code-level integration. Available on the,IQQA(R) Enterprise Engine ...
... Saint Louis University,(SLU) recognized St. Louis-based Sigma-Aldrich(TM) (Nasdaq: ... life science and high technology company,s,recent $1 million ... largest,in Sigma-Aldrich history, comes in the form of ... by the university,s medical school research,teams. (Photo: ...
Cached Biology Technology:Beckman Coulter to Present at the 19th Annual Piper Jaffray Healthcare Conference 2EDDA Technology Introduces Universal Enterprise Solution - Enabling 2D/3D/4D Advanced Clinical Applications on Existing PACS Workstations 2EDDA Technology Introduces Universal Enterprise Solution - Enabling 2D/3D/4D Advanced Clinical Applications on Existing PACS Workstations 3Saint Louis University Honors Sigma-Aldrich Corp. for $1 Million Donation 2
... units/µL ,• High specific activity and processivity ... 'A' overhang ,• Processes ,A ... activity in primer extension and other molecular ... the enzyme, each lot has been functionally ...
... Recombinant DNA polymerase from Thermus aquaticus ... DNA contamination; 1 tube of 250 units ... LD (Low DNA), is the same enzyme ... purified through a proprietary separation process to ...
Our original highly-purified, robust Taq Polymerase which delivers consistently high yields and minimal background...
Taq DNA polymerase, 10,000U...
Biology Products: