Based on the density functional theory of first-principle,we calculated the total energy and electronic structures of the Sn-Al solid solution with various aluminum contents by plane wave pseudo-potential method.Results show that the Sn0.7Al0.3 solid solution is most suitable for electrode materials.Calculations of the physical properties and electrochemical performance of Sn0.7Al0.3 alloy suggest that the solid solution has stable electrochemical lithiation voltage and cycle performance.On the other hand,t...