title: Enhancing Sodium-Ion Storage Behaviors in TiNb2O7by Mechanical Ball Milling.
abstract: Sodium-ion batteries (SIBs) have shown extensive prospects as alternative rechargeable batteries in large-scale energy storage systems, because of the abundance and low cost of sodium. The development of high-performance cathode and anode materials is a big challenge for SIBs. As is well known, TiNb2O7(TNO) exhibits a high capacity of ∼250 mAh g-1with excellent capacity retention as a Li-insertion anode for lithium-ion batteries, but it has rarely been discussed as an anode for SIBs. Here, we demonstrate ball-milled TiNb2O7(BM-TNO) as an SIB anode, which provides an average voltage of ∼0.6 V and a reversible capacity of ∼180 mAh g-1at a current density of 15 mA g-1, and presents excellent cyclability with 95% capacity retention after 500 cycles at 500 mA g-1. A possible Na storage mechanism in BM-TNO is also proposed.
authors.affiliation: School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.|School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology , Wuhan, Hubei 430074, China.
authors.forename: Yangyang
authors.initials: Y
authors.lastname: Huang
authors.affiliation: School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Xiang
authors.identifier: http://orcid.org/0000-0002-1302-7136
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Jiahuan
authors.initials: J
authors.lastname: Luo
authors.affiliation: School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Wang
authors.affiliation: School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Yuegang
authors.initials: Y
authors.lastname: Qiu
authors.affiliation: School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Shixiong
authors.initials: S
authors.lastname: Sun
authors.affiliation: School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology , Wuhan, Hubei 430074, China.
authors.forename: Shantang
authors.initials: S
authors.lastname: Liu
authors.affiliation: School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
authors.forename: Jiantao
authors.identifier: http://orcid.org/0000-0002-9509-3785
authors.initials: J
authors.lastname: Han
authors.affiliation: 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: Na-ion batteries; Na-ion diffusion coefficient; TiNb2O7; anode; ball milling; capacitive