Electrochemical Approach for the Synthesis of Carbon-Metal Fluoride Nanocomposites for Lithium Batteries
Here we propose and demonstrate a rather general approach for the synthesis of CMFNCs at room temperature using CFx as precursor. CFx is known as a cathode material for lithium primary batteries. During discharge process lithium reacts with CFx and form C+LiF. In other words this is an electrochemical method for the synthesis of C-LiF nanocomposites. Fundamentally, it is possible to extend this approach for the synthesis of other C-MFx nanocomposites if the reaction of metal with CFx is thermodynamically feasible provided with suitable metal ion transporting electrolyte. Figure 1 show the discharge curve obtained with CFx cathode and Fe metal foil as anode and Fe2+ transporting liquid electrolyte. During the discharge process the Fe2+ is released into the electrolyte at anode and the CFx is reduced at cathode to form C-FeF2. The discharged electrode was analyzed by XRD and formation of FeF2 is confirmed. The as synthesized C-FeF2 nanocomposites showed excellent reversible lithium storage properties. Further, we have succeeded in the synthesis of various C-MFx nanocomposites by the proposed electrochemical approach.
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