Mg₂Ge/Si Composite Electrodes Prepared by Gas-Deposition as Anodes for Lithium Rechargeable Battery

抄録

Mg₂Ge/Si composite electrodes were prepared by a gas-deposition (GD) method and evaluated their electrochemical properties of anodes for Li rechargeable battery. The discharge capacity of the Mg₂Ge/Si composite electrodes increased in comparison with that of Mg₂Ge GD-film electrode. Among them, the Mg₂Ge/Si composite electrode with 30 wt% Si content exhibited good cycle stability, which is 603 mAh g⁻¹ after 200 cycles. At this composition of composite, each Si particle was surrounded with Mg₂Ge layer, and the Mg₂Ge layer appears to be easy to release the stress generated in the Si particle at Li insertion-extraction because Mg₂Ge is more ductile than Si. Thus, we succeeded to develop the electrode which can take advantage of both high capacity of Si and good cyclability of Mg₂Ge.