Synthesis of Porous Nanostructured MoS2 Materials in Thermal Shock Conditions and Their Performance in Lithium-Ion Batteries,ACS Applied Energy Materials

当前位置： X-MOL 学术 › ACS Appl. Energy Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Synthesis of Porous Nanostructured MoS2 Materials in Thermal Shock Conditions and Their Performance in Lithium-Ion Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-10-22 , DOI: 10.1021/acsaem.0c01837
Svetlana G. Stolyarova ₁ , Alena A. Kotsun ₁ , Yury V. Shubin ₁ , Victor O. Koroteev ₂ , Pavel E. Plyusnin ₁ , Yuri L. Mikhlin ₃ , Maxim S. Mel’gunov ₄ , Alexander V. Okotrub ₁ , Lyubov G. Bulusheva ₁

Affiliation

We offer a simple synthesis of porous nanostructured MoS₂ materials by the rapid decomposition of ammonium tetrathiomolybdate aerogel in an inert atmosphere at temperatures of 400–700 °C. The synthesis products consist of thin elongated porous plates, in which pores of 2–30 nm in size are surrounded by curved MoS₂ layers. The temperature gradient arising upon heating leads to the creation of extended MoS₂ layers on the surface of the plates. The lateral size and the number of adjacent layers on the surface and inside the plates increase with the synthesis temperature. The material obtained at 700 °C showed the best rate capability in lithium-ion batteries. Its specific capacity was 817 mA h g^–1 at a current density of 2 A g^–1 and reached 1139 mA h g^–1 in subsequent cycling at 0.1 A g^–1. Electrochemical impedance spectroscopy revealed fast diffusion of lithium ions and low resistance of charge transfer for this material. A unique architecture, where the hard shell prevents the loss of electrochemically active species and the conductive intertwined MoS₂ layers preserve pores for the accommodation of these species, provides high stability and large storage capacity of the material. The developed synthesis technique can be adopted for nanostructuring of other redox-active compounds promising for energy application fields.

中文翻译：

热冲击条件下多孔纳米结构MoS ₂材料的合成及其在锂离子电池中的性能

通过在惰性气氛中于400–700°C的温度下快速分解四硫代钼酸铵气凝胶，我们提供了一种多孔纳米结构MoS ₂材料的简单合成方法。合成产品由细长的多孔板组成，其中2-30 nm的孔被弯曲的MoS ₂层包围。加热时产生的温度梯度导致在板表面上形成扩展的MoS ₂层。板的表面和板内部的横向尺寸和相邻层数随合成温度的增加而增加。在700°C下获得的材料在锂离子电池中显示出最佳的倍率性能。在2 A g的电流密度下，其比容量为817 mA hg ^–1^-1和达到1139毫安汞柱^-1在0.1 A克在随后的循环^-1。电化学阻抗谱显示该材料的锂离子扩散快，电荷转移电阻低。独特的架构，其中的硬壳可防止电化学活性物质的损失，而导电缠绕的MoS ₂层则保留了用于容纳这些物质的孔，从而提供了高稳定性和材料的大存储容量。所开发的合成技术可用于具有前景的其他氧化还原活性化合物的纳米结构，有望应用于能源领域。

更新日期：2020-11-23

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南