title: Cr0.5Nb24.5O62Nanowires with High Electronic Conductivity for High-Rate and Long-Life Lithium-Ion Storage.
abstract: Intercalation-type TiNbxO2+2.5x(x = 2, 5, and 24) anode materials have recently become more interesting for lithium-ion batteries (LIBs) due to their large theoretical capacities of 388-402 mAh g-1. However, the Ti4+/Nb5+ions in TiNbxO2+2.5xwith empty 3d/4d orbitals usually lead to extremely low electronic conductivity of <10-9S cm-1, greatly restricting their practical capacity and rate capability. Herein, we report a class of highly conductive Cr0.5Nb24.5O62nanowires as an intercalation-type anode material for high-performance LIBs. The as-made Cr0.5Nb24.5O62nanowires show an open shear ReO3crystal structure (C2 space group) with 4% tetrahedra and a conducting characteristic with ultrahigh electronic conductivity of 3.6 × 10-2S cm-1and a large Li+-ion diffusion coefficient of 2.19 × 10-13cm2s-1. These important characteristics make them deliver outstanding electrochemical properties in term of the largest reversible capacity (344 mAh g-1at 0.1 C) in all the known niobium- and titanium-based anode materials, safe working potential (∼1.65 V vs Li/Li+), high first-cycle Coulombic efficiency (90.8%), superior rate capability (209 mAh g-1at 30 C), and excellent cycling stability, making them among the best for LIBs in niobium- and titanium-based anode materials.
authors.affiliation: State Key Laboratory of Marine Resource Utilization in South China Sea, College of Materials and Chemical Engineering, Hainan University , Haikou 570228, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Yang
authors.affiliation: Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University , Xiamen 361005, China.
authors.forename: Shu
authors.initials: S
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Marine Resource Utilization in South China Sea, College of Materials and Chemical Engineering, Hainan University , Haikou 570228, China.
authors.forename: Chunfu
authors.identifier: 0000-0003-0251-7938
authors.initials: C
authors.lastname: Lin
authors.forename: Fan
authors.initials: F
authors.lastname: Lv
authors.affiliation: Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University , Xiamen 361005, China.
authors.forename: Shunqing
authors.initials: S
authors.lastname: Wu
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.affiliation: Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University , Xiamen 361005, China.
authors.forename: Zi-Zhong
authors.initials: ZZ
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Marine Resource Utilization in South China Sea, College of Materials and Chemical Engineering, Hainan University , Haikou 570228, China.
authors.forename: Jianbao
authors.initials: J
authors.lastname: Li
authors.affiliation: State Key Laboratory of Marine Resource Utilization in South China Sea, College of Materials and Chemical Engineering, Hainan University , Haikou 570228, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
authors.forename: Shaojun
authors.identifier: 0000-0003-4427-6837
authors.initials: S
authors.lastname: Guo
keywords: Cr0.5Nb24.5O62 material; electrical property; electrochemical property; lithium-ion battery; nanowire