Cu2Nb34O87 nanowires as a superior lithium storage host in advanced rechargeable batteries. Issue 2 (25th November 2020)

• Record Type: Journal Article
• Authors: Cai, Xinhao; Yan, Huihui; Zheng, Runtian; Yu, Haoxiang; Yang, Zhengwei; Zhang, Xikun; Xia, Maoting; Chen, Wei; Cui, Yanhua; Shu, Jie
• Is Part Of: Inorganic chemistry frontiers. Volume 8:Issue 2(2021)
• Page Start: 444
• Page End: 451
• Publication Date: 2020-11-25
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d0qi01075h
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : Cu2 Nb34 O78 nanowires present a high charge capacity of 279.8 mA h g −1 with a Coulombic efficiency of 89.6% based on Nb 5+ /Nb 4+, Nb 4+ /Nb 3+ and Cu 2+ /Cu + redox couples. Abstract : In this study, for the first time, Cu2 Nb34 O78 nanowires were fabricated via an electrospinning technique and exhibited outstanding electrochemical performance as an anode material. The nanowires presented a charge capacity of 279.8 mA h g −1 with remarkable long-life stability for 300 cycles (0.037% capacity loss per cycle). Significantly, ex situ X-ray diffraction, ex situ high-resolution transmission electron microscopy, and ex situ X-ray photoelectron spectroscopy were performed to unveil the reaction process and change in the microstructure during charge/discharge cycles in detail. The observed evidence demonstrates that the remarkable Li-storage capability is due to the enhanced contact-specific area and reduced transport path of Cu2 Nb34 O78 nanowires. In addition, the host mechanism is unraveled, in which the contribution of the reversible capacity is discussed based on the Nb 5+ /Nb 4+, Nb 4+ /Nb 3+ and Cu 2+ /Cu + redox couples.