纳米硅合金负极材料

Nano-silicon alloy anode material

摘要:

本文研究了一种纳米硅合金锂离子电池负极材料的微观组织和电化学性能。研究结果表明：该负极颗粒的轮廓基本呈圆形,其内部存在着两个含硅量不同的富铜相,在颗粒表层中两相均为纳米结构。该纳米硅合金负极材料需与石墨负极材料、粘结剂和导电剂按一定比例配合使用,搅拌工艺对其电化学性能也有重要影响。在较理想的情况下,所得负极材料的首效率提高到了90%上下,比容量在100周之后仍高于500mAh/g。电池制作工艺与石墨负极相似,便于应用。

Abstract:

The microstructure and electrochemical property of nano-silicon alloy anode material are studied in this paper. The research shows that the outline of the nano-silicon particle is basically circular, 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. The first-cycle coulombic efficiency of the material is improved to about 90%, and the specific capacity is still higher than 500 mAh/g after 100 cycles. The battery manufacturing process is similar to the graphite negative electrode, so it is easy to be applyed.