• Electrochemical fabrication of porous Sn alloy anode structure using 3D open-cell polyurethane template   [CET 2015]
  • Author(s)
  • Sumin Lee
  • The needs of smaller size and longer operation time of portable electronic devices have increased recently. Lithium ion batteries have been used as energy storage device in a variety of portable electronic devices because they have high energy density, large specific capacity, and stable charge-discharge property. Sn has been considered as a next generation anode material replacing conventional carbon-based anode due to its higher specific capacity; however its considerable volume change during charge-discharge cycles limits its real application to lithium ion batteries. In order to overcome the demerit of pure Sn anode, alloying Sn with Ni or Cu has been proposed. In this study, we introduce the fabrication of porous Sn alloy anode structure using 3D open-cell polyurethane template by electrodeposition. 3D open-cell structure of Sn alloy foam enables the faster movement of lithium ions, larger surface area for electrochemical reactions, and shorter diffusion distance of lithium atoms. Sn alloy foam also has advantages of improved conductivity and cycle characteristics. An electrolyte for electrodepositing Sn alloy on the Ni/Ti bilayer surface of the polyurethane template basically consists of SnCl2•2H2O, NiCl2•6H2O (or CuSO4•5H2O), K4P2O7, and H3BO3. Bath temperature, pH, current density and deposition time are major electrodeposition parameters to control the deposition morphology and chemical composition of Sn alloy foams. Heat treatment process is subsequently carried out in an inert gas atmosphere to remove the polyurethane template.
  • Electrochemical fabrication, porous Sn alloy anode structure, 3D open-cell polyurethane template
  • References

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