A new kind of lithium-ion battery holds much more energy than previous versions, while still working well at high temperatures. It could prove useful for hybrid and electric cars, where high-density batteries usually come with safety risks.
Useing a graphite current collector and sodium imide in the battery's electrolyte. These materials enable the battery to last longer and withstand higher temperatures; Leyden has declined to discuss how it achieved higher energy densities.
The company says the battery has an energy density of 225 watt-hours per kilogram. This falls at the high-end range of laptop batteries, and roughly 50 percent higher than lithium-ion batteries used in electric vehicles. The four-year-old startup expects to see its cells used by a tablet PC maker later this year, says Leyden CEO Aakar Patel.
Lithium-ion batteries are widely used in consumer electronics, but design changes are needed to make sure they work safely in electric or hybrid cars. Carmakers are typically forced to use lower-density batteries, and to use electronics and cooling systems to ensure the battery cells don't run too hot. Tesla Motors, for example, uses batteries that are similar to those found in laptops to power its Roadster sports car. The company uses liquid cooling and thermal management electronics and software to prevent overheating and other problems.
A cathode material such as lithium-iron phosphate is sometimes used for electric vehicle batteries because it can withstand high temperatures. The trade-off is that it has a relatively low energy density—around 140 watt-hours per kilogram.
Leyden focuses on the electrolyte and current collector, because the two affect the performance of the cathode and anode and help to determine the longevity and stability of a battery, says Patel. The results are batteries that work just as well in temperatures up to 60 °C, he adds.
Leyden's battery replaces lithium hexafluorophosphate, one of the components of a lithium-ion battery, with sodium imide. Unlike lithium hexafluorophosphate, it does not react with water inside the battery cell, a reaction that significantly degrades the cycle life of a battery. Lithium hexafluorophosphate also starts to decompose at room temperature and loses its effectiveness more significantly when the temperature hits 55 °C. Sodium imide doesn't start to decompose at higher temperatures.
But sodium imide can cause trouble by corroding the aluminum current collector that is typically found in a battery cell. Graphite makes a good substitute because it is immune to this assault. "The key advance for Leyden is not the electrolyte. Their magic is, they are not using aluminum as the current collector," says Venkat Srinivasan, a scientist at the Lawrence Berkeley National Laboratory who has seen the company's technology. "This change allowed them to change the electrolyte."
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Useing a graphite current collector and sodium imide in the battery's electrolyte. These materials enable the battery to last longer and withstand higher temperatures; Leyden has declined to discuss how it achieved higher energy densities.
The company says the battery has an energy density of 225 watt-hours per kilogram. This falls at the high-end range of laptop batteries, and roughly 50 percent higher than lithium-ion batteries used in electric vehicles. The four-year-old startup expects to see its cells used by a tablet PC maker later this year, says Leyden CEO Aakar Patel.
Lithium-ion batteries are widely used in consumer electronics, but design changes are needed to make sure they work safely in electric or hybrid cars. Carmakers are typically forced to use lower-density batteries, and to use electronics and cooling systems to ensure the battery cells don't run too hot. Tesla Motors, for example, uses batteries that are similar to those found in laptops to power its Roadster sports car. The company uses liquid cooling and thermal management electronics and software to prevent overheating and other problems.
A cathode material such as lithium-iron phosphate is sometimes used for electric vehicle batteries because it can withstand high temperatures. The trade-off is that it has a relatively low energy density—around 140 watt-hours per kilogram.
Leyden focuses on the electrolyte and current collector, because the two affect the performance of the cathode and anode and help to determine the longevity and stability of a battery, says Patel. The results are batteries that work just as well in temperatures up to 60 °C, he adds.
Leyden's battery replaces lithium hexafluorophosphate, one of the components of a lithium-ion battery, with sodium imide. Unlike lithium hexafluorophosphate, it does not react with water inside the battery cell, a reaction that significantly degrades the cycle life of a battery. Lithium hexafluorophosphate also starts to decompose at room temperature and loses its effectiveness more significantly when the temperature hits 55 °C. Sodium imide doesn't start to decompose at higher temperatures.
But sodium imide can cause trouble by corroding the aluminum current collector that is typically found in a battery cell. Graphite makes a good substitute because it is immune to this assault. "The key advance for Leyden is not the electrolyte. Their magic is, they are not using aluminum as the current collector," says Venkat Srinivasan, a scientist at the Lawrence Berkeley National Laboratory who has seen the company's technology. "This change allowed them to change the electrolyte."
CloudTags: Lithium-Ion Battery, cool, battery technology, Dell inspiron mini 9 battery,Toshiba pa3098u-1bas battery, Mitac bp-8050 battery, Hp probook 4710s battery, Toshiba pa3399u-1bas battery, Dell inspiron 1520 battery
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