batteries could get a boost from manganese nanocrystals - lithium ion rechargeable battery
Tom SimoniteA's new electrode has the potential to double the rechargeable lithium capacity
Ion batteries used in laptops and mobile phones.
In most existing batteries, the positive electrode is formed by the combination of lithium with cobalt, nickel and oxygen.
Now researchers at the Argonne National Laboratory in Chicago, USA, have found that adding manganese to the mixture can significantly improve the performance of this component. The lithium-
The ion battery in the phone is usually only 100 amps.
Hourly fee per gram.
Argonne's tests show that more than 250 amps can be stored using manganese electrodeshours per gram.
Jim Miller, who led the research project, added: "We think it is possible to push this further . ".
"We plan to reduce the amount of nickel and copper as much as possible because manganese is cheaper," he said . " Cheaper batteries can also store more power, he added, and there may be a dramatic knock on the door
The impact on the cost, weight and portability of many devices.
As a lithium-
Lithium-ion batteries charge and lithium-ion moves from the negative to the positive.
When it is discharged, the lithium ion moves in the opposite direction.
The electrical properties of manganese make these lithium ions easier to travel.
However, as the flow increases, the change in volume can cause the positive pole itself to become unstable.
To solve this problem, the Argonne team created a mixture of nano-crystals for the positive pole.
These are produced by reacting manganese, nickel and cobalt compounds with lithium hydroxide at 900 °c.
This creates a mixture of two kinds of nano-crystals, each of which is mixed approximately between microns.
Half of the nano-crystals are made of manganese, nickel and cobalt, all of which provide performance improvements.
The other is lithium manganese oxide.
These crystals are not lively but can stabilize other crystals.
"This is an exciting result because it should provide the highest energy density [reported]
Such an electrode]
"John Owen said he was a chemist at the University of Southampton in the UK who worked in battery research.
"It has a high potential [voltage]at 4.
3 volts, large capacity.
He explained: "The voltage provided by lithium cobalt oxide used in existing cell phone batteries is 4 v, but the capacity is only half.
However, Owen said that despite the surprising new results, there is still a lot to prove.
For example, these experiments only absorb half of the current needed to power the phone.
"They also need to test it in more charging cycles," Owen said . ".
"They have reached 10 so far, but it takes about 1,000 people to properly test.