Heterostructured Nanocube‐Shaped Binary Sulfide (SnCo)S2 Interlaced with S‐Doped Graphene as a High‐Performance Anode for Advanced Na+ Batteries

By Chenghao Yang, Xinghui Liang, Xing Ou, Qiaobao Zhang, Hong‐Shen Zheng, F. Zheng, Jenghan Wang, Kevin Huang, Meilin Liu. Advanced Functional Materials, 2019

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Heterostructuring electrodes with multiple electroactive and inactive supporting components to simultaneously satisfy electrochemical and structural requirements has recently been identified as a viable pathway to achieve high‐capacity and durable sodium‐ion batteries (SIBs). Here, a new design of heterostructured SIB anode is reported consisting of double metal‐sulfide (SnCo)S2 nanocubes interlaced with 2D sulfur‐doped graphene (SG) nanosheets. The heterostructured (SnCo)S2/SG nanocubes exhibit an excellent rate capability (469 mAh g−1 at 10.0 A g−1) and durability (5000 cycles, 487 mAh g−1 at 5.0 A g−1, 92.6% capacity retention). In situ X‐ray diffraction reveals that the (SnCo)S2/SG anode undergoes a six‐stage Na+ storage mechanism of combined intercalation, conversion, and alloying reactions. The first‐principle density functional theory calculations suggest high concentration of p–n heterojunctions at SnS2/CoS2 interfaces responsible for the high rate performance, while in situ transmission electron microscopy unveils that the interlacing and elastic SG nanosheets play a key role in extending the cycle life.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/89f8c462ed3d7007d46452b6feee11cf7396f94b