title: WS2 Nanowires as a High-Performance Anode for Sodium-Ion Batteries.
abstract: We report the synthesis and anode application for sodium-ion batteries (SIBs) of WS2 nanowires (WS2 NWs). WS2 NWs with very thin diameter of ≈25 nm and expanded interlayer spacing of 0.83 nm were prepared by using a facile solvothermal method followed by a heat treatment. The as-prepared WS2 NWs were evaluated as anode materials of SIBs in two potential windows of 0.01-2.5 V and 0.5-3 V. WS2 NWs displayed a remarkable capacity (605.3 mA h g(-1) at 100 mA g(-1) ) but with irreversible conversion reaction in the potential window of 0.01-2.5 V. In comparison, WS2 NWs showed a reversible intercalation mechanism in the potential window of 0.5-3 V, in which the nanowire-framework is well maintained. In the latter case, the interlayers of WS2 are gradually expanded and exfoliated during repeated charge-discharge cycling. This not only provides more active sites and open channels for the intercalation of Na(+) but also facilitates the electronic and ionic diffusion. Therefore, WS2 NWs exhibited an ultra-long cycle life with high capacity and rate capability in the potential window of 0.5-3 V. This study shows that WS2 NWs are promising as the anode materials of room-temperature SIBs.
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, 94 Weijin Rd, Nankai, Tianjin, 300071 (China).
authors.forename: Yongchang
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, 94 Weijin Rd, Nankai, Tianjin, 300071 (China).
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, 94 Weijin Rd, Nankai, Tianjin, 300071 (China).
authors.forename: Hongyan
authors.initials: H
authors.lastname: Kang
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, 94 Weijin Rd, Nankai, Tianjin, 300071 (China).
authors.forename: Minghui
authors.initials: M
authors.lastname: Shang
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, 94 Weijin Rd, Nankai, Tianjin, 300071 (China). jiaolf@nankai.edu.cn.
authors.forename: Lifang
authors.initials: L
authors.lastname: Jiao
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, 94 Weijin Rd, Nankai, Tianjin, 300071 (China). chenabc@nankai.edu.cn.|Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071 (China). chenabc@nankai.edu.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
keywords: WS2; electrochemical exfoliation; expanded interlayers; nanowires; sodium-ion batteries