New long battery life for mobile devices
Tin-sulfur-lithium ion battery as an alternative to conventional lithium batteries
The vulnerability of virtually all mobile devices today is much too short battery life. According to diligently research also focuses on improved batteries, which deliver significantly more energy, more durable and thereby to be reliable. Italian researchers now have a new variant of a lithium-ion batteries developed that could meet these criteria.
Laptop in action
The dilemma: cell phones, laptops, smartphones and PDAs are getting smaller, but also increases its energy needs. The batteries that come with no more: Treating it is not always the absolute good care, he breathes his life soon completely. Likewise, research on improved batteries, which deliver significantly more power, longer life and thereby to be reliable. Theoretically, this would lithium-sulfur battery energy supplier of choice because they - based on the mass supply - much more energy than conventional lithium ion batteries. The practical application, however, suffers from the fact that the electrodes dissolve gradually, resulting in loss of capacity. In addition, lithium metal can be deposited in the form of branches, causing short circuits.
That is the reason why commercial contained “Lithium” batteries, no metallic lithium electrodes, but also record a material, the lithium ions, and can unlock it, sometimes graphite. Such a properly-called lithium ion battery cell generates the source voltage only by a shift of lithium ions and provides correspondingly less energy.
Without metallic lithium battery
Bruno Scrosati, and Yusef Hassoun from the University of Rome have now developed a promising approach for a new variant of a lithium ion battery. The researchers combine the advantages of both types of long-life battery, in order to get along well storable, reliable, easily manufacturable, high-capacity battery. Your lithiummetallfreien new kind of cell uses a cathode (negative electrode) from a carbon-lithium sulfide composite.
To minimize the dissolution of electrode components to replace the scientists and the organic electrolyte solution through a lithiumionenhaltige trapped in a gel-polymer membrane liquid. The polymer protects the saturated with lithium sulfide liquid from the electrodes. The anode (positive electrode), and Hassoun Scrosati chose nanoscopic Zinnpartikel that are enclosed in a protective carbon matrix.
Also suitable as a vehicle drive
The electrochemical process is as follows: At the cathode is lithium sulfide into elemental sulfur and lithium ion gespalten.Dabei electrons are released. The lithium ions migrate through the electrolyte membrane to the anode, where they take up electrons and become neutral lithium atoms. The latter are bound by the tin oxide nanoparticles of the anode in the form of an alloy.
The process is reversible, so the battery can be recharged repeatedly. With a specific energy of about 1,100 watt-hours per Kilgramm the new cell exceeds all previous lithiummetallfreien batteries. With this high energy density of the new battery could also establish itself as a power source of choice for electric vehicles.
End with: HP Battery, Compaq Battery, 372770-001, 395789-001, 398876-001.
