Electrochemical behaviors of wax-coated Li powder/Li4Ti5O12 cells

Abstract

The wax-coated Li powder specimen was effectively synthesized using the drop emulsion technique (DET). The wax layer on the powder was verified by SEM, Focused Ion Beam (FIB), EDX and XPS. The porosity of a sintered wax-coated Li electrode was measured by linear sweep voltammetry (LSV) and compared with that of a bare, i.e., un-coated Li electrode. The electrochemical behavior of the wax-coated Li powder anode cell was examined by the impedance analysis and cyclic testing methods. The cyclic behavior of the wax-coated Li powder anode with the Li4Ti5O12 (LTO) cathode cell was examined at a constant current density of 0.35 mA cm(-2) Wit h the cut-off voltages of 1.2-2.0 V at 25 degrees C. Over 90% of the initial capacity of the cell remained even after the 300th cycle. The wax-coated Li powder was confirmed to be a stable anode material. (c) 2008 Elsevier B.V. All rights reserved.