Polydopamine-Derived Carbon-Coated Sn/SnO2 Anodes for High-Performance Sodium-Ion Batteries

2026-07-06

PRE

Mengkui Li

Jiaqi Sun

Jiaqi Chen

Wenjun Huang

Xujin Kong

Hang Gao

Jiachen Cao

Xiang Li *

DOI：10.1002/ente.70572

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Tin dioxide (SnO2) has attracted significant attention as an anode material for sodium-ion batteries (SIBs), primarily due to its high theoretical capacity and the abundance of its constituent elements. However, its poor electronic conductivity and significant volume changes during repeated sodium-ion insertion/extraction severely limit its practical application. This study successfully synthesized a series of polydopamine (PDA)-derived carbon-coated Sn/SnO2 composites (Sn/SnO2@C) through a hydrothermal method combined with carbonization treatment. By adjusting the usage of PDA, the carbon content and structural disorder can be precisely controlled. Structural and compositional analysis indicates that Sn/SnO2 nanoparticles are uniformly encapsulated by a continuous nitrogen-doped amorphous carbon layer, forming a stable core–shell structure. Electrochemical evaluations demonstrate that the optimized Sn/SnO2@C-1 electrode delivers a high reversible capacity of 251.5 mAh g−1 after 300 cycles at 0.1 A g−1, long-term cycling stability with 159.0 mAh g−1 at 0.5 A g−1 and 143.5 mAh g−1 at 1.0 A g−1 after 800 cycles, also exhibits excellent rate capability. This study highlights the pivotal role of PDA-derived carbon structures in optimizing tin dioxide anodes, providing significant insights for the rational design of high-performance SIBs.

Keywords:

polydopamine-derived carbon

pseudocapacitive behavior

SnO2-based anode

sodium-ion batteries

Polydopamine-Derived Carbon-Coated Sn/SnO2 Anodes for High-Performance Sodium-Ion Batteries

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