Shandong Sacred Sun Power Co.

Qufu, China

Shandong Sacred Sun Power Co.

Qufu, China

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Tan C.,Shandong University | Qi G.,Shandong University | Li Y.,Shandong University | Guo J.,Shandong University | And 4 more authors.
Journal of Alloys and Compounds | Year: 2013

Three sets of Sn-Co 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 Sn-Co alloy materials are investigated by scanning electron microscopy, X-ray diffraction and atomic absorption spectrophotometer. The electrochemical performance of the Sn-Co 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 Sn-Co alloy materials after electrochemical dissolution treatment have porous structure and higher specific capacity than those of the as-deposited Sn-Co alloy materials. The initial capacity of a porous Sn-Co alloy sample attains 1109 mA h g-1, and remains 580 mA h g-1 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. © 2013 Elsevier B.V. All rights reserved.


Tan C.,Shandong University | Qi G.,Shandong University | Li Y.,Shandong University | Guo J.,Shandong University | And 4 more authors.
International Journal of Electrochemical Science | Year: 2013

CuIn order to improve the specific capacity and rate capability of the electrodeposited Sn-Ni alloy, a post electrochemical dissolution treatment was introduced to prepare porous Sn-Ni alloy. Experimental results suggest that composition of the alloys can be controlled by changing the electroplating condition evidenced by atomic absorption spectrophotometer. Porous structure formed and Sn phase lost in electrochemical dissolution progress evidenced by scanning electron microscopy and X-ray diffraction. Porous Sn-Ni alloys deliver a higher specific capacity than as-deposited Sn-Ni alloys. The specific capacity of the best one delivers ca. 540 mAhg-1 after 50 cycles. This improvement is attributing to reduction of Sn content and formation of nanopore in the alloy matrix after the post electrochemical dissolution treatment. The post electrochemical dissolution treatment is an effective way to improve the performance of Sn-Ni alloy as the anode material for lithium-ion battery. © 2013 by ESG.


Tan C.,Shandong University | Qi G.,Shandong University | Li Y.,Shandong University | Guo J.,Shandong University | And 4 more authors.
International Journal of Electrochemical Science | Year: 2012

Three kinds of binder-free nanoporous Sn-Cu alloys are prepared by electroplating followed by electrochemical dealloying and tested as possible negative electrode materials for lithium-ion battery. The morphology and structure of these alloys were characterized by X-ray diffraction, scanning electron microscopy and atomic absorption spectrophotometer. Experimental results suggest that thecomposition, pore size, size distribution, homogeneity of the alloys can be facilely controlled by changing the ratio of main salts in the electroplating bath. The Sn content in the alloys after electrochemical dealloying reduces significantly and Cu6Sn5 become the main active component. However there is no obvious decrease in specific capacity. The initial specific capacities of all the materials are in 480-810 mA h g-1 range. But the capacity of as-deposited Sn-Cu alloys remain only 110-190 mA h g-1 after 50 cycles, while one of the capacity of the nanoporous Sn-Cu alloys remain around 400 mA h g-1 after the same cycles. This suggests that both capacity and cycling performance can be improved by optimizing the nanostructure of the materials using electrochemical dealloying. © 2012 by ESG.

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