Interlayer-expanded MoS2 assemblies for enhanced electrochemical storage of potassium ions  

作　　者：Sijia Di Pan Ding Yeyun Wang Yunling Wu Jun Deng Lin Jia Yanguang Li 

机构地区：[1]Institute of Functional Nano and Soft Materials(FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices,Soochow University,Suzhou,215123,China

出　　处：《Nano Research》2020年第1期225-230,共6页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51972219);the Priority Academic Program Development of Jiangsu Higher Education Institutions and Collaborative Innovation Center of Suzhou Nano Science and Technology.

摘　　要：Potassium-ion batteries are regarded as the low-cost alternative to lithium-ion batteries.However,their development is hampered by the lack of suitable electrode materials.In this work,we demonstrate that MoS2 with expanded interlayers represents a promising candidate for the electrochemical storage of potassium ions.Hierarchical interlayer-expanded MoS2 assemblies supported on carbon nanotubes are prepared via a straightforward solution method.The increased interlayer spacing not only enables the better accommodation of foreign ions,but also lowers the diffusion energy barrier and improves diffusion kinetics of ions.When investigated as the anode material of potassium ion batteries,our interlayer-expanded MoS2 assemblies exhibit an excellent electrochemical performance with large capacity(up to∼520 mAhg^−1),good rate capability(∼310 mAhg^−1 at 1,000 mAg^−1)and impressive cycling stability,superior to most competitors.

关 键 词：molybdenum disulfide interlayer expansion potassium ion batteries hierarchical structure 

分 类 号：TM912[电气工程—电力电子与电力传动]