Abstract
Tin(Sn) and its alloys have been attracting attentions as a negative electrode material for lithium-ion and sodium-ion secondary batteries with high theoretical capacity (Li22Sn5, ca. 990 mAh･g−1) and high electromotiveforce. There still remains the issue as regards the discharge capacity decrease with increasing the number of cycles. In order to improve cycle performance, Sn film which has nano-sized or amorphous grain to alleviation volume expansion with using electrodeposition was developed. In addition, 3D-nano flexible structure was used with collector for creating space to alleviate volume expansion.The effect of additives on the surface morphology and microstructure of Sn film was investigated. Furthermore, we evaluated the effect of 3D-nano flexible structure into the Sn film on cycle performance of the Sn negative electrode.
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