Si/SnS2 Nanocomposite for Lithium Ion Battery Anodes

We introduced a Si/SnS2 anode material with a high energy density and excellent cycle stability. The structure of this Si/SnS2 composite material is nanosized SnS2 coated on the surface of nanosilicon. Using the structural advantages of the coating structure, combined with the lithium storage mechanism of tin disulfide, the performance of silicon materials has been improved from three aspects: alleviating the volume expansion effect, improving the stability of the solid electrolyte interface (SEI), and enhancing the electrical conductivity. The material exhibits very excellent performance when applied to lithium-ion battery anodes. At the current density of 0.5 A·g–1, the specific discharge capacity of the electrode material is maintained at 2217 mAh·g–1 after 100 cycles, and the capacity retention rate reached 65.3%. It also has high Coulombic efficiency of 86.1% for the first cycle and 96–99.9% for the following cycles.