Sn作為鋰離子二次電池負極材料具有高電容量的優點，但Sn經過數次充放電後，因體積變化過於激烈，導致極片表面產生裂紋，循環性不佳，因此必須添加其它元素來抑制體積變化，如Sb、Cu或混合SnO2。本研究採用放電加工(Electrical Discharge Machining, EDM)法製備Sn、Sn-15Sb及Sn-40Sb負極材料粉末，探討不同組成之負極材料粉末以及氧化層對充放電循環特性之影響。
　　EDM法製得之Sn負極材料粉末形貌多數為圓球狀，少部份為不規則狀；而Sn-xSb負極材料粉末則多數為不規則狀。粉末表面則因EDM製程特性而有氧化層的產生。
　　充放電循環測試結果發現Sn-xSb的充放電循環性均明顯優於Sn。Sn-15Sb在30次循環以前的放電電容量優於Sn-40Sb，而30-50次循環則是Sn-15Sb略低於Sn-40Sb，但兩者之充放電循環性則沒有明顯的差異。另外Sn-15Sb充放電初期可發現類似鎳氫電池之活化現象，比對Sn-15Sb與Sn-40Sb初期循環之嵌鋰曲線後，推測Sn-15Sb之活化現象乃是由於表面之氧化層所導致。

　Sn as an anode material for lithium-ion rechargeable batteries has the advantage of its high capacity. However, cracks occur on the surface of the Sn anode as a result of drastic volume expansion during charge-discharge cycling. They undermine the cyclability of Sn and make it necessary to effectively restrict the volume expansion of Sn by adding other elements such as Sb, Cu and SnO2. In this study, the effects of anode materials in different compositions and oxidized layers on charge-discharge characteristics are examined by using Sn, Sn-15Sb and Sn-40Sb in powder form prepared with electrical discharge machining (EDM).
　Most of the Sn powder prepared with EDM is spherical and a small part of it is irregular. Most of the Sn-xSb powder is irregular. The EDM process also contributes to the formation of oxidized layers on powder surfaces.
　The results of a charge-discharge cycling test reveal that the Sn-xSb anode had better charge-discharge cyclability than the Sn anode. The former has higher discharge capacity than the latter before the 30th cycles. However, the Sn-40Sb anode has slightly lower discharge capacity compared to the Sn-15Sb anode between the 30th and the 50th cycles. Nevertheless, there is no significant difference in the charge-discharge cyclability between the two. In addition, activation similar to that in Ni/MH batteries is observed during initial charge-discharge cycling of the Sn-15Sb anode. A comparison between the charge–discharge curves of the Sn-15Sb and Sn-40Sb anodes during the initial two cycles suggests that the activation is caused by the oxidized layer on the surface of the Sn-15Sb anode.

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