相較於現行廣泛使用之商用碳材，Mg作為鋰離子二次電池之負極具有高電容量優勢，但因Mg活性高、安全性不佳，且於多數次充放電後因體積膨脹，造成電池壽命不佳，故需添加其他元素以增加電池之循環能力，如：Ni、C、Sb，其中Ni具有與鋰不反應之性質，能夠減緩Mg之反應性，另外C成本低廉與易取得，這兩種材料添加進入Mg基系統中將可成為現今極具潛力之負極材料。
本實驗同時採用鍍膜與粉末電極製備Mg基電極極片，並討論各種極片之顯微組織與充放電特性及電化學性質。實驗結果顯示，Mg-C系統因有界面效應能減緩反應活性，組成上隨著增加C之比例，在初期充放電能有較佳表現；另外，添加Ni粉與Ni膜確實能達到降低反應活性，使得電池效能更趨穩定，該粉末於常溫特性並無顯著改善，然而於高溫(55度C)充放電測試中則具優異性能，其充放循環電容量顯著提升。此外，粉末電極循環充放電後之組織特徵和高溫電解液離子溶出行為亦被調查，可證實Mg-Ni粉末電極之電化學特性對高溫循環性有正面助益。

Compared to widely used graphite anode material for lithium-ion rechargeable batteries, Mg can replace it because of its high capacity. However, Mg has several disadvantages, such as high activity, low safety, and volume expansion caused by repeated charge-discharge cycles will reduce cycle performance of batteries. So it must add other elements to raise cyclability, ex: Ni, C, Sb. Ni has a special characteristic that Ni does not react with Li so that Ni can decrease the reactivity of Mg. In addition, C has features such as abundant material supply and relatively low cost. Therefore, Mg adding these materials becomes the best candidate of anode materials for lithium-ion rechargeable batteries.
In this study, Mg-based thin film and powder anodes were both prepared, and then their microstructures, charge-discharge characteristics and electrochemical properties were investigated. The results showed that Mg-C powders system had an interface effect of Cu foil to reduce the electrochemical reaction. And it had better cycle performance at initial stage with increasing ratio of C powder and adding Ni powder and Ni thin film can decrease the activity of Mg anodes in order to increase the stability of batteries. Although Mg-Ni powder electrode did not improve the discharge characteristic significantly at room temperature, it had good performance at high temperature. Then surface morphology of electrode and mechanism of ion dissolved in electrolyte were discussed. As result, it can be proved that electrochemical properties Mg-Ni powder electrode has close relation with high temperature cyclability.

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