Zheng Xiang, Zhang Zining, Li Zhiqian, Shi Chaohong, Zhao Jianqing, Tang Jing
State Key Laboratory of Petroleum Molecular & Process Engineering, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, China.
College of Energy, Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou, 215006, China.
ChemSusChem. 2025 Jan 14;18(2):e202401271. doi: 10.1002/cssc.202401271. Epub 2024 Oct 30.
Copper sulfide has received widespread attention for application as anode materials in sodium-ion batteries due to their potent capabilitiess and eco-friendly properties. However, it is a challenge to achieve a high rate capability and long cycle stability owing to the heterogeneous transfer of sodium ions during charge-discharge, the interior poor electron conductivity and repeated volumetric expansion of copper sulfide. In this study, Sb-doped copper sulfide hollow nanocubes coated with carbon shells (Sb-CuS@C) was designed and constructed as anode nanomaterials in sodium-ion batteries. Thanks to the intrinsic good electron conductivity and chemical stability of carbon shells, Sb-CuS@C possesses a higher overall electron transfer as anode material, avoids agglomeration and structural destruction during the cycling. As a result, the synthesized Sb-CuS@C achieved an excellent reversible capacity of 595 mA h g after 100 cycles at 0.5 A g and a good rate capability of 340 mA h g at a higher 10 A g. DFT calculations clarify that the uniformly doped Sb would act as active sodiophilic nucleation sites to help adsorbing sodium-ion during discharging and leading uniform sodium deposition. This work provides a new insight into the structural and componential modification for common transition-metal sulfides towards application as anode materials in sodium-ion battery.
硫化铜因其出色的性能和环保特性，作为钠离子电池的负极材料受到了广泛关注。然而，由于在充放电过程中钠离子的异质转移、内部电子导电性差以及硫化铜的反复体积膨胀，要实现高倍率性能和长循环稳定性是一项挑战。在本研究中，设计并构建了一种包覆有碳壳的锑掺杂硫化铜空心纳米立方体（Sb-CuS@C）作为钠离子电池的负极纳米材料。得益于碳壳固有的良好电子导电性和化学稳定性，Sb-CuS@C作为负极材料具有更高的整体电子转移能力，避免了循环过程中的团聚和结构破坏。结果，合成的Sb-CuS@C在0.5 A g下循环100次后实现了595 mA h g的优异可逆容量，在更高的10 A g下具有340 mA h g的良好倍率性能。密度泛函理论计算表明，均匀掺杂的锑将作为活性亲钠成核位点，有助于在放电过程中吸附钠离子并导致均匀的钠沉积。这项工作为常见过渡金属硫化物作为钠离子电池负极材料的结构和成分改性提供了新的见解。
