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22 Sep 2014

FEVAXRZHX1WIMWV.MEDIUM

by pinomelean @ instructables.com:

Lithium based batteries are a versatile way of storing energy; they have one of the highest energy density and specific energy(360 to 900 kJ/kg) among rechargeable batteries.

The downside is that, unlike capacitors or other kinds of batteries, they can not be charged by a regular power supply. They need to be charged up to a specific voltage and with limited current, otherwise they turn into potential incendiary bombs.

And that’s no joke, storing such a high amount of energy in a small and normally tight packaged device can be really dangerous.

Li-ion battery charging guide - [Link]

22 Sep 2014

Lithium

by elektor.com:

We all know lithium-ion batteries need careful monitoring to prevent over-charging and ensure cell temperature remains within limits. We all thought we knew the best way to replace the charge as well: trickle charge, take it nice and gentle to keep the cell temperature down and prolong cell life. Turns out we may have got that last one wrong! New findings published in the Nature Materials Journal by a team of researchers at Stanford University indicate that by tweaking the battery design it may be possible to get faster charge/discharge rates and also increase the number of charge cycles.

Better lithium-ion Charging - [Link]

9 Sep 2014

 

USB_charger_LiIon

A USB port is a great power source for charging a single cell Lithium-Ion battery. It is capable of supplying a maximum of 5.25V and 500 mA. The circuit above is a USB powered single cell Li-Ion battery charger. LM3622 is used as the controller. This special purpose IC has a precise end-of-charge control and low battery leakage current about 200nA.  S1 and S2 select the low voltage detect enable/disable.  The low voltage detection is handy for conditioning a deeply discharged battery with a low current stage, to prepare it for the full charge cycle.

LM3622 Li-Ion USB Battery Charger - [Link]

28 Aug 2014

stanford-stable-lithium-anode

By Colin Jeffrey:

Stanford University researchers claim to have created the first stable pure lithium anode in a working battery by using carbon nanospheres as a protective sheath to guard against degradation. As a result, the researchers predict that commercial developments may eventually result in anything up to a tripling of battery life in the not-too-distant future.

At a basic level, a battery is composed of three main elements: the anode (the positive terminal), the cathode (the negative terminal), and the electrolyte (a solid or liquid chemical that stores electrical energy) which fills the battery between these two terminals. In ordinary Lithium-ion batteries, it is an all too common problem that the lithium in the battery can crystallize into dendrites – microscopic fibers that expand into the electrolyte, and can eventually short-circuit the battery, significantly reduce battery life or, worse, causing the battery to catch fire.

Stable lithium anode may triple battery efficiency - [Link]


19 Jul 2014

613d2a7ed73e0d53d551d2286a103d5f_large

Rechargeable batteries save us a lot of money but take a lot of time. What if you could recharge a battery in seconds instead of hours?

Rechargeable batteries save us a lot of money these days but for the savings, we give up some of our time, waiting for them to recharge. What if though. What if there was a rechargeable battery that took seconds to recharge instead of hours? That is exactly what I’ve invented and I need your help to bring this to the masses and show the world that we no longer need to waste hours of or lives waiting for a battery to charge.

With the leaps and bounds being made today with capacitors, they’ve gone from being able to store a tiny potential of energy to now, being able to store enough energy to be considered a power source. These high Farad capacitors are known as super capacitors and aside from providing electricity for an extended period of time, they can also be charged very quickly. Recently, there’s been another development, combining the technology of super capacitors with lithium ion batteries. The usually downside to super capacitors from batteries is that they don’t provide electricity for nearly as long. However, with the advent of the lithium ion capacitor, that is quickly changing.

30 Second Charging, Rechargeable Battery - [Link]

9 Jul 2014

sand-lithium-ion-battery

By Darren Quick @ gizmag.com:

Conventional lithium-ion batteries rely on anodes made of graphite, but it is widely believed that the performance of this material has reached its zenith, prompting researchers to look at possible replacements. Much of the focus has been on nanoscale silicon, but it remains difficult to produce in large quantities and usually degrades quickly. Researchers at the University of California, Riverside have overcome these problems by developing a lithium-ion battery anode using sand.

Sand-based anode triples lithium-ion battery performance - [Link]

19 Jun 2014

charging-battery-in-minutes

By Dario Borghino:

Researchers at the University of California, Riverside have developed a silicon anode that would allow us to charge lithium-ion batteries up to 16 times faster than is currently possible. The new design relies on a three-dimensional, cone-shaped cluster of carbon nanotubes that could also result in batteries that hold about 60 percent more charge while being 40 percent lighter.

New li-ion battery anode could charge electronics in minutes - [Link]

 

1 Jun 2014

adafruit_products_1904-00

Tutorial – MicroLipo and MiniLipo Battery Chargers @ The Adafruit Learning System.

Sooner or later you’ll need to cut the cord…the power cord! Untether your electronic project from the tyranny of the wall adapter and take it out into the world. That’s where batteries come in, and you may have been seduced by the high power density, large current capabilites and recharge-ability of Lithium Polymer or Lithium Ion batteries. These battery chemistries have quickly become the most popular rechargeable batteries in consumer products, powering everything from keychain mp3 players to huge laptops.

Tutorial – MicroLipo and MiniLipo Battery Chargers - [Link]

30 May 2014

bq27742

by Texas Instruments :

The Texas Instruments bq27742-G1 is a fuel gauge for single-cell Li-ion battery packs that uses patented Impedance Track technology to deliver rate-, temperature-, and aging-compensated predictions of remaining battery capacity and system runtime with highest accuracy. The device also includes a fully integrated high-side protector that eliminates the need for a separate Li-ion protection circuit and provides a full suite of high-accuracy fault detections for overvoltage, undervoltage, overcurrent in charge, overcurrent in discharge, and short-circuit in discharge conditions. The hardware protection functions offer built-in data flash-based programmability, allowing simple reconfiguration of existing devices for varying end equipment needs.

bq27742-G1 – Single Cell Li-Ion Battery Fuel Gauge With Integrated Protection - [Link]

23 May 2014

sillyputtymaby elektor.com

Surely everyone remembers their first encounter with silly putty. Knead it into a sphere and it becomes a super bouncy ball, hit it hard and it shatters into pieces that slowly flow together again. Originally developed during the Second World War as a possible substitute for rubber, it is a curiosity, a solution looking for a problem…A team of researchers at the University of California, Riverside Bourns College of Engineering have discovered that the same material can be used in lithium-ion batteries to give them three times the energy storage of a standard cell.

In a paper entitled ‘Stable Cycling of SiO2 Nanotubes as High-Performance Anodes for Lithium-Ion Batteries’ published online in the journal Nature Scientific Reports, the research team describe how using silicon dioxide nanotune anodes in Lithium-ion batteries produced a cell with over three times as much energy storage as a standard Li-ion cell which uses carbon-based anodes. They also found that the silicon dioxide nanotubes remain extremely stable in the battery environment giving the battery a long lifespan. Early results showed no loss of capacity after 100 recharge cycles and the team are confident that it can be cycled many hundreds more times.

Silly Putty boosts Li-ion Energy Density - [Link]



 
 
 

 

 

 

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