Cu-Al-Si alloy anode material with enhanced electrochemical properties for lithium ion batteries

The microstructure and electrochemical property of Cu-Al-Si alloy anode material are studied in this paper. The research shows that the alloy particle has a basic circular outline, and two copper-rich phases with different silicon contents are detected in the particle, and both phases with nanostructure are observed in its surface layer. The nano-silicon alloy negative electrode material needs to be used in a certain proportion with graphite, binder and conductive agent, and the stirring process also has an important influence on its electrochemical performance. Multiple mixing can achieve a better cycle retention compared to direct mixing. The first-cycle coulombic efficiency of the electrode material is improved up to about 90%, and the specific capacity is still higher than 500 mAh g(-1) after 100 cycles. The battery manufacturing process is similar to the graphite negative electrode, so it is easy to be applied.