Synthesis of Silicon-Alloy Composite Thick-Film Anodes Using Gas-Deposition for Lithium Secondary Batteries

通过机械合金化和气相沉积制备了由 Si 和各种金属硅化物组成的复合活性材料厚膜电极，用于锂离子电池负极。我们研究了这些电极的性能与硅化物的特性、电阻率、参考断裂强度和热力学稳定性之间的关系。 LaSi_2/Si复合电极表现出优异的循环性能。这表明复合电极中热力学稳定的LaSi_2可以提高电极的导电率，并可以长期释放Si体积变化引起的应力。

Thick-film electrodes of composite active materials consisted of Si and various metal silicides were prepared by mechanical alloying followed by gas deposition for anodes of Li-ion batteries. We investigated a relationship between the performance of these electrodes and properties of the silicides, the electrical resistivity, the referential breaking strength, and the thermodynamic stability. The LaSi_2/Si composite electrode exhibited superb cycling performance. It is suggested that thermodynamically stable LaSi_2 in the composite electrode can improve the electrical conductivity of the electrode and can release the stress induced by a volumetric change of Si for a long period.