Great battery that powered electric cars
Scientists in the US have built a lithium based 'super asus a31-s5 battery，asus a31-s6 battery，asus a32-a8 battery' that releases its charge 100 times faster than a regular rechargeable. They say their design has applications in renewable energy storage and will help researchers build a better battery for hybrid electric vehicles.
Lithium ion batteries are already ubiquitous in consumer electronics. They are the rechargeable batteries widely used to power mobile phones and laptops. But scaling these up for electric cars, for instance, requires a dramatic improvement in charge and discharge rates - otherwise a plug-in electric vehicle would need to be plugged in for many hours to fully recharge.
Byoungwoo Kang and Gerbrand Ceder at the Massachusetts Institute of Technology have now developed materials for a high power battery that discharges in just 10-20 seconds. 'We show that by simply tweaking the composition of the battery material we can achieve fast charging and discharging rates - like a supercapacitor - while keeping energy density comparable with a asus a32-m9 battery，asus a32-s5 battery，asus a32-s6 battery,' says Kang.
The team's battery is based on lithium iron phosphate (LiFePO4) nanoparticles with a five nanometre thick glassy coating in which the levels of iron, phosphorus and oxygen are reduced. In a battery, charge and discharge rates depend on quick delivery of lithium ions and electrons to the material. According to the researchers, their glassy coating has high Li+ mobility and helps speed the delivery of the ions.
Although other groups have tried coating asus a33-m9 battery，asus a41-w3 battery，asus a42-a3 battery materials in conducting glasses, Peter Bruce, an electrochemist at the University of St Andrews, UK, says none have shown any improved rate capability by doing so. 'The thing that interests me most is not so much the absolute rate of charge and discharge, but more the fact that the coating of the particles by this lithium conducting glass seems to enhance the rate of the lithium phosphate material,' he says.
Lithium ion phosphate is one of the topical materials for high rate applications, says Bruce, and so increasing its rate performance is likely to be useful technologically. However, he points out that the study focuses on discharge rates, whereas a battery for a hybrid vehicle would need to charge and discharge rapidly.
But Kang argues their strategy should improve both charging and discharging rates for lithium asus a42-a4 battery，asus a42-m6 battery，asus a42-v6 battery and could improve the performance of electric cars. 'If our material applies to hybrid vehicles, short time charging and the acceleration of the speed can be achieved,' he says.
The battery can charge in seconds
A new manufacturing method for lithium-ion batteries ,ibm laptop battery,could lead to smaller, lighter batteries that can be charged in just seconds.
Batteries that discharge just as quickly would be useful for electric and hybrid cars, where a quick jolt of charge is needed for acceleration.
The approach only requires simple changes to the production process of a well-known material.
The new research is reported in the scientific journal Nature.
Because of the electronic punch that they pack, gram for gram, lithium-ion batteries are the most common rechargeable ibm thinkpad r50 battery,ibm thinkpad r50e battery found in consumer electronics, such as laptops.
However, they take a long time to charge; researchers have assumed until now that there was a speed limit on the lithium ions and electrons that pass through the batteries to form an electrochemical circuit.
Tiny holes
Gerbrand Ceder, at the Massachusetts Institute of Technology (MIT), US, and his colleagues used a computer simulation to model the movements of ions and electrons in a variant of the standard lithium ibm thinkpad r50p battery,ibm thinkpad r51 battery known as lithium iron phosphate.
The simulation indicated that ions were moving at great speed.
"If transport of the lithium ions was so fast, something else had to be the problem," Professor Ceder said.
That problem turned out to be the way ions passed through the material.
They pass through minuscule tunnels, whose entrances are present at the surface of the material.
However, the team discovered that to get into these channels, the ibm thinkpad r52 battery,ibm thinkpad t40 battery ions had to be positioned directly in front of the tunnel entrances - if they were not, they could not get through.
The solution, Ceder discovered, was to engineer the material such that it has a so-called "beltway" that guides the ions towards the tunnel entrances.
Traffic management
A prototype battery made using the new technique could be charged in less than 20 seconds - in comparison to six minutes with an untreated sample of the material.
Most commercial ibm thinkpad t40p battery,ibm thinkpad t41 battery use a material made up of lithium and cobalt, but lithium iron phosphate does not suffer from overheating - something that has affected laptop and mp3 player batteries in a number of incidents.
Even though it is cheap, lithium iron phosphate has until now received little attention because lithium cobalt batteries can store slightly more charge for a given weight.
However, the researchers found that their new material does not lose its capacity to charge over time in the way that standard lithium ion batteries do.
That means that the excess material put into standard batteries to compensate for this loss over time is not necessary, leading to smaller, lighter batteries with phenomenal charging rates.
What is more, because there are relatively few changes to the standard manufacturing process, Professor Ceder believes the new ibm thinkpad t41p battery,ibm thinkpad t42p battery material could make it to market within two to three years.