226 / 2022-02-15 13:42:10

Nitrogen and Sulfur Co-doped Graphene Aerogels/SnO2@SnS2 heterostructure Building high-performance Lithium and sodium-ion batteries

Graphene Aerogels,SnO2@SnS2 heterostructure,Lithium and sodium-ion batteries

（7）矿物与先进能源材料 > 5. 电池材料及其废弃物管理

The construction of heterostructures can enable materials to have excellent application properties in high-speed electronics, optoelectronics, and other fields, thanks to the charge transfer driving force embedded in the material, which is beneficial to the material-specific charge transfer kinetics. However, the rational design and controllable synthesis of high-rate performance nano-heterostructure anode materials remain a great challenge. In this work, we successfully used a one-step hydrothermal method to uniformly anchor SnO₂@SnS₂ heterostructures to Nitrogen and Sulfur co-doped Graphene. The faster electron transport kinetics than SnO₂ can be achieved at heterointerfaces of SnO₂@SnS₂ through electrochemical tests analysis. The enhanced mobility is due to the interfacial effect of the heterostructure, which induces an electric field inside the nanocrystals, making the nanocrystals less resistant to ionic diffusion and facilitating interfacial electron transport. In addition, SnO₂@SnS₂ nanocrystals (3-5 nm) can greatly shorten the diffusion path of Li/Na ions, while the NSG substrate has good electrical conductivity and structural stability is good. High reversible charge storage capacities are achieved for both LIBs (1093 mAh g⁻¹, 0.1 A g⁻¹, 209 mAh g⁻¹, 5A g⁻¹) and SIBs (532 mAh g⁻¹, 0.1 A g⁻¹, 87 mAh g ⁻¹, 5 A g⁻¹).