Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China; Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry and Science, College of Textiles, North Carolina State University, Raleigh, NC 27695-8301, USA.
Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry and Science, College of Textiles, North Carolina State University, Raleigh, NC 27695-8301, USA.
J Colloid Interface Sci. 2019 Feb 15;536:655-663. doi: 10.1016/j.jcis.2018.10.101. Epub 2018 Oct 30.
Antimony tin (SnSb) based materials have become increasingly attractive as a potential anode material for sodium-ion batteries (SIBs) owing to their prominent merit of high capacity. However, cyclic stability and rate capability of SnSb anodes are currently hindered by their large volume change during repeated cycling, which results in severe capacity fading. Herein, we introduce carbon-coated centrifugally-spun SnSb@carbon microfiber (CMF) composites as high-performance anodes for SIBs that can maintain their structural stability during repeated charge-discharge cycles. The centrifugal spinning method was performed to fabricate SnSb@CMFs due to its high speed, low cost, and large-scale fabrication features. More importantly, extra carbon coating by chemical vapor deposition (CVD) has been demonstrated as an effective method to improve the capacity retention and Coulombic efficiency of the SnSb@CMF anode. Electrochemical test results indicated that the as-prepared SnSb@CMF@C anode could deliver a large reversible capacity of 798 mA h∙g at the 20th cycle as well as a high capacity retention of 86.8% and excellent Coulombic efficiency of 98.1% at the 100th cycle. It is, therefore, demonstrated that SnSb@CMF@C composite is a promising anode material candidate for future high-performance SIBs.
锑锡（SnSb）基材料由于其高容量的突出优点，已成为钠离子电池（SIBs）中极具吸引力的潜在阳极材料。然而，SnSb 阳极的循环稳定性和倍率性能目前受到其在反复循环过程中体积变化大的限制，这导致了严重的容量衰减。在此，我们介绍了碳包覆的离心纺丝 SnSb@碳微纤维（CMF）复合材料，作为 SIBs 的高性能阳极，能够在反复的充放电循环中保持其结构稳定性。由于其高速、低成本和大规模制造的特点，采用离心纺丝法制备了 SnSb@CMFs。更重要的是，通过化学气相沉积（CVD）进行额外的碳涂层已被证明是一种提高 SnSb@CMF 阳极容量保持率和库仑效率的有效方法。电化学测试结果表明，所制备的 SnSb@CMF@C 阳极在第 20 次循环时可提供 798 mA h·g 的大可逆容量，在第 100 次循环时具有 86.8%的高容量保持率和 98.1%的优异库仑效率。因此，证明了 SnSb@CMF@C 复合材料是未来高性能 SIBs 有前途的阳极材料候选物。
