【量子點新突破,30秒让手机电量满满的】

【量子點新突破,30秒让手机电量满满的】范德比尔特大学的机械工程助理教授领导的小组发现可以用黄铁矿这种地球上最多的物质做量子点。量子点具有强大的储电能力,能在30秒内快速将手机充满电。而其制作新材料黄铁矿数量多,成本低,克服了以往量子点生存周期短的缺陷。

Charge your phone in 30 SECONDS: Quantum dots covered in fool's gold may help power batteries, claim scientists

  • Quantum dots are tiny particles with powerful conducting properties
  • Their use has so far been limited as they only last a few charge cycles
  • Making the quantum dots out of fool's gold can make them last longer
  • This is because it changes form into compound to better store energy

Scientists believe that have found a way to charge a smartphone battery in 30 seconds.

They claim that using something known as 'quantum dots' can significantly speed up charging times.

Quantum dots are tiny particles of a semiconducting material - 10,000 times narrower than a human hair - that have unique electrical properties.

The 'dots' can be altered to have certain properties, such as the ability to generate charge when strained.

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But, up until now, the effect of these dots on improving charging has only lasted for a few cycles.

Now researchers have found making the quantum dots out of iron pyrite - also known as fool's gold. 

They say this can produce batteries that charge quickly and work for dozens of cycles.

The research team was headed by Cary Pint, assistant professor of mechanical engineering at Vanderbilt University.

He became interested in fool's gold because it is one of the most abundant materials in the earth's surface.

It's produced in raw form as a byproduct of coal production and is so cheap that it is used in lithium batteries that are thrown away after a single use.

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'Researchers have demonstrated that nanoscale materials can significantly improve batteries, but there is a limit,' Pint says.

'When the particles get very small, generally meaning below 10 nanometers (40 to 50 atoms wide), the nanoparticles begin to chemically react with the electrolytes and so can only charge and discharge a few times.

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Iron pyrite works so well because it has a unique way of changing form into an iron and a lithium-sulphur compound to store energy.

This is a different mechanism from how commercial lithium-ion batteries store charge.

In this process, lithium inserts into a material during charging and is extracted while discharging.

The process leaves the material that stores the lithium mostly unchanged.

According to Pint, 'You can think of it like vanilla cake.

'Storing lithium or sodium in conventional battery materials is like pushing chocolate chips into the cake and then pulling the intact chips back out.

'With the interesting materials we're studying, you put chocolate chips into vanilla cake and it changes into a chocolate cake with vanilla chips.'

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As a result, the rules that forbid the use of ultrasmall nanoparticles in batteries no longer apply. In fact, the scales are tipped in favor of very small nanoparticles.

Pint believes that understanding of chemical storage mechanisms and how they depend on nanoscale dimensions is critical to enable the evolution of battery performance at a pace that stands up to Moore's law and can support the transition to electric vehicles.

'The batteries of tomorrow that can charge in seconds and discharge in days will not just use nanotechnology, they will benefit from the development of new tools that will allow us to design nanostructures that can stand up to tens of thousands of cycles and possess energy storage capacities rivaling that of gasoline,' says Pint.

 'Our research is a major step in this direction.'

链接:http://www.dailymail.co.uk/sciencetech/article-3316192/Charge-phone-30-SECONDS-Quantum-dots-covered-fool-s-gold-help-power-batteries-claim-scientists.html

 


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