Large Interlayer Spacing of Few-Layered Cobalt-Tin-Based Sulfide Providing Superior Sodium Storage.
Mixed transition metal sulfides (MTMSs) have been regarded as a potential anode material for sodium-ion batteries (SIBs) due to their high reversible specific capacity. Herein, nanoflower-like few-layered cobalt-tin-based sulfide (F-CoSnS) with a large interlayer spacing is synthesized via a facile route for superior sodium storage. The growth mechanism of this unique F-CoSnS is systematically studied. Such distinctive nanostructured engineering synergistically combines a broad interlayer spacing (∼ 0.85 nm), the functionalities of few (2-3) layers, and the introduction of heterogeneous metal atoms, reducing the ion diffusion energy barrier for high-efficiency intercalation/deintercalation of Na+ ions, as revealed by density functional theory (DFT) calculations. With further incorporation of a three-dimensional (3D) conductive network, the F-CoSnS@C electrode shows a large sodium storage capacity (493.4 mAh g-1 at 50 mA g-1), remarkable rate capability (316.1 mAh g-1 at 1600 mA g-1), and superior cycling stability (450 mAh g-1 at 50 mA g-1 with 91.2% capacity retention, 0.044% fading rate per cycle, and approximately 100% Coulombic efficiency after 200 cycles). This work demonstrates that the few-layered ternary MTMSs are highly applicable for the development of advanced SIB anode materials with high performance.
['Dou|Shuming|S|', 'Xu|Jie|J|', 'Sari|Hirbod Maleki Kheimeh|HMK|', 'Wu|Hong-Hui|HH|http://orcid.org/0000-0002-1381-2281', 'Hu|Junhua|J|http://orcid.org/0000-0003-0191-1503', 'Zhang|Yaohui|Y|http://orcid.org/0000-0001-9156-5709', 'Fan|Linlin|L|', 'Xiong|Dongbin|D|', 'Zhou|Wei|W|http://orcid.org/0000-0002-8004-3996', 'Chen|Yanan|Y|http://orcid.org/0000-0002-6346-6372', 'Li|Xifei|X|http://orcid.org/0000-0002-4828-4183']
large interlayer spacing few-layered MTMSs sodium-ion batteries F-CoSnS