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The herein presented invention provides a method for the preparation of a cobalt oxide-carbon composite and its application as active material in electrodes for lithium-ion batteries.
Advantageously, the within this invention utilized sugar serves not only as a reduction agent to obtain CoO-particles starting from Co3O4, but serves furthermore as a carbon source to form a carbonaceous layer on the particles surface, thus inhibiting particle agglomeration upon thermal treatment and subsequent electrode preparation.
Moreover, the carbon coating enhances the electrical conductivity of the resulting electrodes and buffers the volume expansion upon lithiation.
As sugar is an abundant and very cheap reduction agent, this technology can easily be integrated into an industrial production process.
Keywords: Lithium-ion battery, anode material, electrochemical energy storage, cobalt oxide
Compared to other processes this is a rather mild way of reduction. Therefore, the initial shape and size of the preliminary Co3O4 particles can be preserved. The enhanced electric conductivity of the so obtained CoO-composite leads to an improved cycling stability of cells with electrodes prepared of such material. Beside this, the process enables further reduction of cobalt oxide to elementary cobalt and can also be applied to other transition metals.
A national patent application for this invention has been filed at the German Patent Office (DPMA). Proper functioning of the invention has been shown in several experiments and further improvement is currently under development.
PROvendis is offering licenses for this invention to interested companies on behalf of the University of Muenster.