Soon, battery that have better efficiency than traditional ones

Last Updated: Wednesday, November 20, 2013 - 11:50

Washington: Japanese researchers have fabricated a cathode (positive electrode) of lithium cobalt oxide (LiCoO2) in which the compound`s individual grains are aligned in a specific orientation, which they claim yields a significantly higher-performing battery than one with a randomly-oriented LiCoO2 cathode.

Primary, or non-rechargeable, batteries and secondary batteries both produce current through an electrochemical reaction involving a cathode, an anode, and an electrolyte (an ion-conducting material).

However, apply an outside current to a secondary battery and the negative-to-positive electron flow that occurs during discharge is reversed. This allows the battery to restore lost charge.

Co-author Tohru Suzuki, said that in a lithium-ion battery, lithium ions move from the anode to the cathode during discharge and back when charging.

Suzuki said that the material in the cathode has a layered structure to facilitate intercalation [insertion] of the lithium ions; if the structure is oriented in a specific fashion, the lithium ions have better access to the lattice and, in turn, charge-discharge performance is improved.

Using a rotating magnetic field, the researchers were able to fabricate the ideal textured microstructure of the individual LiCoO2 grains making up the cathode: a perpendicular alignment of the c-plane (the vertical side) and a random orientation of the c-axis.

Unlike cathodes where the microstructures in both the c-plane and c-axis are randomly oriented, the specialized grains allow easy access for lithium ions while relaxing the stress associated with intercalation.

The study has been published in the journal APL Materials.

ANI

First Published: Wednesday, November 20, 2013 - 11:50

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