Porous Network Nitrogen-Doped Carbon-Supported Nano-Tin Sulfide Composite for Ultrastable Lithium Storage

With the rapid growth of demand for green energy, the requirements for high specific capacity, rate capability, and long-life anode materials in lithium-ion batteries (LIBs) are constantly increasing. It is imperative to research and develop anode materials with excellent electrochemical performance. Tin-based sulfides (SnS, SnS 2 ) are one of the alternatives to traditional graphite anode materials in LIBs, with advantages such as high specific capacity, high safety, low cost, and no pollution. However, their initial efficiency is low, and there is a large volume effect during the cycling process, resulting in poor stability of their lithium storage cycling performance, which affects their further application. This work explores a nitrogen-doped carbon-loaded nano-SnS (CN/SnS-2) composite to create a reasonable porous network microstructure, improve electronic conductivity, effectively alleviate the volume expansion of SnS-based electrodes, and enhance the stability of the solid electrolyte interface during cycling. After 500 cycles at 0.5 A g –1, the specific capacity of the CN/SnS-2 electrode remains at 694 mAh g –1, with a capacity retention rate of 84.7%, indicating its high Coulomb efficiency and excellent cycling stability. This provides a simple and effective method for preparing network nitrogen-doped carbon-loaded nano-tin composite anode materials with stable cycling performance.