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17 Nov 2011

New technology improves both energy capacity and charge rate in rechargeable batteries.

EVANSTON, Ill. — Imagine a cellphone battery that stayed charged for more than a week and recharged in just 15 minutes. That dream battery could be closer to reality thanks to Northwestern University research.

A team of engineers has created an electrode for lithium-ion batteries — rechargeable batteries such as those found in cellphones and iPods — that allows the batteries to hold a charge up to 10 times greater than current technology. Batteries with the new electrode also can charge 10 times faster than current batteries.

The researchers combined two chemical engineering approaches to address two major battery limitations — energy capacity and charge rate — in one fell swoop. In addition to better batteries for cellphones and iPods, the technology could pave the way for more efficient, smaller batteries for electric cars.

The technology could be seen in the marketplace in the next three to five years, the researchers said.

A paper describing the research is published by the journal Advanced Energy Materials.

“We have found a way to extend a new lithium-ion battery’s charge life by 10 times,” said Harold H. Kung, lead author of the paper. “Even after 150 charges, which would be one year or more of operation, the battery is still five times more effective than lithium-ion batteries on the market today.”

New technology improves both energy capacity and charge rate in rechargeable batteries - [Link]

31 Oct 2011

KIT (Karlsruhe Institute of Technology) researchers have developed a new concept for rechargeable batteries. Based on a fluoride shuttle — the transfer of fluoride anions between the electrodes – it promises to enhance the storage capacity reached by lithium-ion batteries by several factors. Operational safety is also increased, as it can be done without lithium. The fluoride-ion battery is presented for the first time in the “Journal of Materials Chemistry” by Dr. Maximilian Fichtner and Dr. Munnangi Anji Reddy.

Lithium-ion batteries are applied widely, but their storage capacity is limited. In the future, battery systems of enhanced energy density will be needed for mobile applications in particular. Such batteries can store more energy at reduced weight. For this reason, KIT researchers are also conducting research into alternative systems. A completely new concept for secondary batteries based on metal fluorides was developed at the KIT Institute of Nanotechnology (INT). [via]

Fluoride increases storage capacity of rechargeable batteries - [Link]

12 Apr 2011

EngineeringShock writes:

This circuit acts as a never-dying, forever rechargeable battery. If treated properly and with respect, it will live longer than you do! That’s right! You will die before this variable battery does! Eerie, eh? The circuit employs about $90 worth of circuitry, but it sure beats buying batteries. I use this circuit every single day when I get home from work to listen to music. Depending on your input charging method (DC, solar, etc), charging can take only minutes. With this, I can listen to music out of my computer speakers at high volume for about two hours before having to re-charge. Use it to charge your cell phone. Use it to power your radio! Use it as a portable power supply! Wire it up to a flash light, or use it to power your halloween costume! The possiblities are endless! I am selling this in kit form! See the last page of this instructable for details.

The Forever Rechargeable VARIABLE Super Capacitor Battery !!! – [Link]

12 Apr 2011

BrianH writes:

Do you have a pile of AA rechargeable batteries in your drawer? Some are old, some are new, but which sets would you bring with your camera on your next trip, and which ones are past their useful life? I like using rechargeable batteries, but I’m certain that some of them are not living up to the stated capacity on the label.

Rechargeable Battery Capacity Tester – [Link]


14 Feb 2011

dangerousprototypes.com writes:

BrianH has posted a useful Instructables project that tests the capacity of rechargeable NiMh and NiCd batteries. The circuit is based on an Atmega168, and functions by draining the AA batteries (from 1 to 3 batteries) then computes and reports the capacity in mAh. It uses a Nokia 5510 graphic LCD to report battery condition and three MOSFETs used to switch the resistive load on and off during testing.

Capacity tester for rechargeable batteries – [Link]

4 Feb 2011

Interesting article from IEEE Spectrum about the potential benefits of developing a usefully rechargeable lithium-oxygen cell (for use, most importantly, in electric cars) and the challenges that remain for that research. So-called “air batteries,” in which one of the reacting chemical species is atmospheric oxygen, are already widely employed, for instance, in hearing-aid batteries, which are commonly zinc-air cells with a piece of adhesive film that must be removed before use to allow atmospheric oxygen onto the cathode. The know-how to make lithium-air cells is available right now; the hard part is making the reverse process practical over many recharging cycles. [via]

The quest for a rechargeable lithium-air battery – [Link]

23 Sep 2010

This project shows how to build a rechargeable led flashlight powered by magnets and housed in a mints container. Check details on the link below.

Rechargable LED Flashlight – [Link]

1 Aug 2010

This project shows how to wire a circuit able to power a device using a photovoltaic and recharge the backup battery from excess power of solar panel. Find out how the panel and battery is connected on the link below.

Solar Power Circuit with Rechargeable Battery – [Link]

7 Feb 2008

fini_5vps.jpg

Dave writes –

Sure power supply projects aren’t that sexy; but they are, generally speaking, the foundation for every electronics project. The voltage output for this project is 5VDC, and a practical output that can be applied to a wide variety of digital components. Even better, this power supply has a 2-pin plug that can be quickly and easily snapped into a common 2-pin header for a reliable and solid power connection. Add a pushbutton ON-OFF switch and a USB rechargeable interface and you have a versatile power supply that can be slipped inside your pocket. [via]

Make a Rechargeable, pocket-sized 5V power supply - [Link]



 
 
 

 

 

 

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