School of Metallurgy and Environment, Central South University, Changsha 410083, China.
Nanoscale. 2017 Aug 24;9(33):12189-12195. doi: 10.1039/c7nr03690f.
Sodium-ion batteries (SIBs) show great potential as alternative energy storage devices for next generation energy storage systems due to the deficiency of lithium resources. MoS is a promising anode material for SIBs due to its high theoretical sodium storage capability and large interspace for accommodating sodium ions with a larger ionic radius than lithium ions. However, bulk MoS exhibits a sluggish kinetics for the intercalation-deintercalation of sodium ions and large volume expansion, which result in poor cyclability and rate performance. In this study, we designed few-layered MoS/C nanoflowers with expanded interspacing of MoS-MoS planes using polyvinyl alcohol (PVA) as an intercalating reagent and a carbon precursor. Due to the unique nanostructure and larger interlayer spacing, the MoS/C nanoflower electrode achieves a high reversible specific capacity of 400 mA h g after 300 cycles at 500 mA g for sodium-ion batteries (SIBs), showing a good cycling stability. The improved electrochemical performance suggests that the MoS/C composite is a promising anode material for sodium ion storage.
钠离子电池（SIBs）由于锂资源的缺乏，作为下一代储能系统的替代能源存储设备显示出巨大的潜力。MoS 是 SIBs 的一种很有前途的阳极材料，因为它具有很高的理论钠储存能力和较大的空间，可以容纳比锂离子具有更大离子半径的钠离子。然而，块状 MoS 表现出钠离子的嵌入-脱嵌动力学缓慢和体积膨胀大的特点，导致较差的循环寿命和倍率性能。在本研究中，我们设计了使用聚乙烯醇（PVA）作为插层试剂和碳前体的具有扩展 MoS-MoS 层间间距的少层 MoS/C 纳米花。由于独特的纳米结构和较大的层间距，MoS/C 纳米花电极在 500 mA g 下，经过 300 次循环后，在钠离子电池（SIBs）中实现了 400 mA h g 的高可逆比容量，表现出良好的循环稳定性。改进的电化学性能表明，MoS/C 复合材料是一种很有前途的钠离子存储用阳极材料。
