Details

Autor(en) / Beteiligte

• Tan, Chunhui
• Qi, Gongwei
• Li, Yeping
• Guo, Jing
• Wang, Xin
• Kong, Delong
• Wang, Hongjun
• Zhang, Shuyong

Titel

Performance enhancement of SnaCo alloys for lithium-ion battery by electrochemical dissolution treatment

Ist Teil von

• Journal of alloys and compounds, 2013-10, Vol.574, p.206-211

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Three sets of SnaCo alloy materials with improved porous structure are designed and facilely prepared via a two-step strategy comprising of electrodeposition followed by electrochemical dissolution treatment. The structure, composition and morphology of the SnaCo alloy materials are investigated by scanning electron microscopy, X-ray diffraction and atomic absorption spectrophotometer. The electrochemical performance of the SnaCo alloy materials as negative electrode materials for lithium-ion battery was tested by cyclic voltammetry, galvanostatic charge-discharge cycling and rate capability test. It is found that the resultant SnaCo alloy materials after electrochemical dissolution treatment have porous structure and higher specific capacity than those of the as-deposited SnaCo alloy materials. The initial capacity of a porous SnaCo alloy sample attains 1109 mA h ga1, and remains 580 mA h ga1 after 70 cycles. This performance improvement can be mainly attributed to the formation of optimized porous structure during electrochemical dissolution treatment, which can buffer the great volume fluctuation of Sn phase during cycling and therefore reduce cracking and shelling of the materials.