Chen Hongwen, Jia Bei-Er, Lu Xinsheng, Guo Yichuan, Hu Rui, Khatoon Rabia, Jiao Lei, Leng Jianxing, Zhang Liqiang, Lu Jianguo
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Ocean College, Zhejiang University, Zhoushan, 316021, China.
Chemistry. 2019 Jul 25;25(42):9973-9983. doi: 10.1002/chem.201901487. Epub 2019 Jul 2.
Tin diselenide (SnSe ), as an anode material, has outstanding potential for use in advanced lithium-ion batteries. However, like other tin-based anodes, SnSe suffers from poor cycle life and low rate capability due to large volume expansion during the repeated Li insertion/de-insertion process. This work reports an effective and easy strategy to combine SnSe and carbon nanotubes (CNTs) to form a SnSe /CNTs hybrid nanostructure. The synthesized SnSe has a regular hexagonal shape with a typical 2D nanostructure and the carbon nanotubes combine well with the SnSe nanosheets. The hybrid nanostructure can significantly reduce the serious damage to electrodes that occurs during electrochemical cycling processes. Remarkably, the SnSe /CNTs electrode exhibits a high reversible specific capacity of 457.6 mA h g at 0.1 C and 210.3 mA h g after 100 cycles. At a cycling rate of 0.5 C, the SnSe /CNTs electrode can still achieve a high value of 176.5 mA h g , whereas a value of 45.8 mA h g is achieved for the pure SnSe electrode. The enhanced electrochemical performance of the SnSe /CNTs electrode demonstrates its great potential for use in lithium-ion batteries. Thus, this work reports a facile approach to the synthesis of SnSe /CNTs as a promising anode material for lithium-ion batteries.
二硒化锡（SnSe₂）作为一种负极材料，在先进锂离子电池中具有出色的应用潜力。然而，与其他锡基负极一样，由于在反复的锂嵌入/脱嵌过程中体积膨胀较大，SnSe₂的循环寿命较差且倍率性能较低。这项工作报道了一种有效且简便的策略，将SnSe₂与碳纳米管（CNTs）结合形成SnSe₂/CNTs混合纳米结构。合成的SnSe₂具有规则的六边形形状和典型的二维纳米结构，并且碳纳米管与SnSe₂纳米片结合良好。这种混合纳米结构可以显著减少电化学循环过程中对电极造成的严重损伤。值得注意的是，SnSe₂/CNTs电极在0.1C时表现出457.6 mA h g⁻¹的高可逆比容量，100次循环后为210.3 mA h g⁻¹。在0.5C的循环速率下，SnSe₂/CNTs电极仍可达到176.5 mA h g⁻¹的高值，而纯SnSe₂电极的值为45.8 mA h g⁻¹。SnSe₂/CNTs电极增强的电化学性能证明了其在锂离子电池中的巨大应用潜力。因此，这项工作报道了一种简便的方法来合成SnSe₂/CNTs，作为一种有前景的锂离子电池负极材料。
