title: Micro-MoS2 with excellent reversible sodium-ion storage.
abstract: Low storage capacity and poor cycling stability are the main drawbacks of the electrode materials for sodium-ion (Na-ion) batteries, due to the large radius of the Na ion. Here we show that micro-structured molybdenum disulfide (MoS2 ) can exhibit high storage capacity and excellent cycling and rate performances as an anode material for Na-ion batteries by controlling its intercalation depth and optimizing the binder. The former method is to preserve the layered structure of MoS2 , whereas the latter maintains the integrity of the electrode during cycling. A reversible capacity of 90 mAh g(-1) is obtained on a potential plateau feature when less than 0.5 Na per formula unit is intercalated into micro-MoS2 . The fully discharged electrode with sodium alginate (NaAlg) binder delivers a high reversible capacity of 420 mAh g(-1) . Both cells show excellent cycling performance. These findings indicate that metal chalcogenides, for example, MoS2 , can be promising Na-storage materials if their operation potential range and the binder can be appropriately optimized.
authors.affiliation: Key Laboratory for Renewable Energy, Chinese Academy of Sciences, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190 (P. R. China).
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Wang
authors.forename: Yejing
authors.initials: Y
authors.lastname: Li
authors.forename: Zhaoruxin
authors.initials: Z
authors.lastname: Guan
authors.forename: Zhaoxiang
authors.initials: Z
authors.lastname: Wang
authors.forename: Liquan
authors.initials: L
authors.lastname: Chen
keywords: MoS2; binder; metal chalcogenides; molybdenum; sodium ion batteries