title: Mechanism of Capacity Fade in Sodium Storage and the Strategies of Improvement for FeS2Anode.
abstract: Pyrite FeS2has attracted extensive interest as anode material for sodium-ion batteries due to its high capacity, low cost, and abundant resource. However, the micron-sized FeS2usually suffers from poor cyclability, which stems from structure collapse, exfoliation of active materials, and sulfur dissolution. Here, we use a synergistic approach to enhance the sodium storage performance of the micron-sized FeS2through voltage control (0.5-3 V), binder choice, and graphene coating. The FeS2electrode with the synergistic approach exhibits high specific capacity (524 mA h g-1), long cycle life (87.8% capacity retention after 800 cycles), and excellent rate capability (323 mA h g-1at 5 A g-1). The results prove that a synergistic approach can be applied in the micron-sized sulfides to achieve high electrochemical performance.
authors.affiliation: State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Kongyao
authors.initials: K
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Wuxing
authors.initials: W
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Lihong
authors.initials: L
authors.lastname: Xue
authors.affiliation: State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Weilun
authors.initials: W
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Xinghua
authors.initials: X
authors.lastname: Xiang
authors.affiliation: State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Min
authors.initials: M
authors.lastname: Wan
authors.affiliation: State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Yunhui
authors.identifier: http://orcid.org/0000-0003-3852-7038
authors.initials: Y
authors.lastname: Huang
keywords: FeS2; PAA-Na binder; graphene coating; sodium batteries; voltage control