Generation of AgSi film by magnetron sputtering for use as anodes in lithium ion batteries

In the present work we deposit Si film with 20%at. Ag, to improve the capacity retention and the cycleability of Si anode. The physical properties of the as-synthesized sample are investigated by thin film XRD and SEM. Charge-discharge properties, cyclic voltammetry, electrochemical impedance spectroscopy and cycle performance of the AgSi electrode are examined in detail when used as negative electrode versus lithium. The galvanostatic test result shows that the electrode delivers 1825 mAh g^-1 initially with 95% Coulombic efficiency and retains 96% of its initial discharge capacity after 40 cycles. This outstanding coulombic efficiency of the electrode can be related to the presence of Ag, which decreases the polarization of anode.