Electrochemical Insertion of Lithium into Graphite–Zinc Composites

Dailly, A.; Ghanbaja, J.; Willmann, P.; Billaud, D.
September 2004
Journal of Applied Electrochemistry;Sep2004, Vol. 34 Issue 9, p885
Academic Journal
Metal-based composites are currently under investigation as possible negative-electrode materials in lithium-ion batteries. We present here a new composite material composed of zinc particles deposited mainly onto graphite surfaces. This Zn/graphite composite was prepared by reduction of zinc chloride ZnCl2 by a KC8 graphite intercalation compound in tetrahydrofuran. Electrochemical insertion of lithium occurs both in graphite and in zinc. A stable specific charge of 355 mAh g-1 is obtained starting from the third charge/discharge cycle. As in Sb/graphite composites prepared by the same technique, the stabilizing role of graphite against metal fragmentation and pulverization is demonstrated.


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