SnS₂/GDYO as a high-performance negative electrode for lithium-ion capacitors

Lithium-ion capacitors (LICs) offer high-rate performance, high specific capacity, and long cycling stability, rendering them highly promising for large-scale energy storage applications. In this study, we have successfully employed a straightforward hydrothermal method to fabricate tin disulfide/graphdiyne oxide composites (SnS₂/GDYO). GDYO serves to mitigate the volume expansion of SnS₂ nanosheets during charge–discharge processes and concurrently enhances their electrical conductivity. Compared to SnS₂, SnS₂/GDYO as a negative electrode material for lithium-ion batteries (LIBs) exhibits superior rate performance and cycling stability. Based on this, SnS₂/GDYO-based LICs demonstrate outstanding electrochemical performance, with a maximum energy density of 75.6 Wh kg⁻¹ and a peak power density of 10 kW kg⁻¹. Even after 2000 cycles, the capacity retention remains impressively high at 66.1%. Consequently, SnS₂/GDYO emerges as a highly promising negative electrode material in LICs for future applications.