Steric-hindrance effect and self-sacrificing template behavior induced PDA@SnO2-QDs/N-doped carbon hollow nanospheres: Enhanced structural stability and reaction kinetics for long-cyclic Li-ion half/full batteries

Effective Encapsulated Strategy throughout Lithiation/Delithiation: Enabling a Stable Interface and Fast Kinetics of Silicon Anode for High-Performance Lithium-Ion Half/Full Batteries

“…Studies have shown that the hydroxyl group of polydopamine can form a strong hydrogen bond with Sn 2+ in an aqueous solution, providing good conditions for the uniform SnO 2 coating . Meanwhile, the acidic hydrothermal conditions created by SnO 2 formation would lead to the depolymerization and pyrolysis of PDA, forming N-doped carbon . Therefore, the Si@NC@SnO 2 nanospheres in Figure e and Figure S2 were obtained after the hydrothermal reaction.…”

“…26 Meanwhile, the acidic hydrothermal conditions created by SnO 2 formation would lead to the depolymerization and pyrolysis of PDA, forming N-doped carbon. 25 Therefore, the Si@NC@SnO 2 nanospheres in Figure 1e and Figure S2 were obtained after the hydrothermal reaction. The composition and crystal structure of the Si and Si@NC@SnO 2 nanospheres were analyzed by X-ray diffraction patterns.…”

“…In this work, we demonstrated a low-cost, scalable method to obtain a uniform encapsulation of nano-Si by the nitrogendoped carbon (NC) and the SnO 2 hybrid shell to fabricate the Si@NC@SnO 2 core−shell nanospheres. Based on our previous research, 25 polydopamine (PDA) was uniformly coated on the surface of nano-Si to assist the subsequent uniform deposition of SnO 2 quantum dots under hydrothermal conditions. At the same time, this acidic hydrothermal environment promoted the pyrolysis of PDA to form NC with sufficient elasticity, which increased the conductivity and the ability to buffer the volume expansion of the Si@NC@SnO 2 anode.…”

Optimized crystal orientation for enhanced reaction kinetics and reversibility of SnSe/NC hollow nanospheres towards high-rate and long-term lithium/sodium storage

“…30 According to the quantitative results of the low-frequency region (Table S1 †), compared to SnSe/NC-650 and SnSe/NC-750, the SnSe/NC-550 electrode provides a lower charge transfer impedance and faster ion diffusion for enhanced reaction kinetics. 42 Particularly, the diffusion coefficients of Li + (D Li+ ) in the three electrodes were evaluated by the GITT test after normalization of times, 37,38,43 as shown in Fig. 3h and Fig.…”

Tailoring hierarchical porous core–shell SnO2@Cu upon Cu–Sn alloys through oxygen binding energy difference for high energy density lithium-ion storage

“…Compounding SnO 2 with a metallic material reduces poor conductivity by adopting the conductivity of the metal [35,36]. A large number of works have combined the above strategies to address the application of SnO 2 [37][38][39]. To the best of our knowledge, there are no reports to research the effect that the core-shell structure of metal base has on the lithium storage properties of SnO 2 , and the investigation of its formation mechanism.…”