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Energy, Environmental, and Catalysis Applications
H0.92K0.08TiNbO5 Nanowires Enabling High Performance Lithium-Ion Uptake Yu Yuan, Haoxiang Yu, Xing Cheng, Wuquan Ye, Tingting Liu, Runtian Zheng, Nengbing Long, Miao Shui, and Jie Shu ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.8b21817 • Publication Date (Web): 14 Feb 2019 Downloaded from http://pubs.acs.org on February 20, 2019
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ACS Applied Materials & Interfaces
H0.92K0.08TiNbO5 Nanowires Enabling High Performance Lithium-Ion Uptake
Yu Yuan 1, Haoxiang Yu 1, Xing Cheng, Wuquan Ye, Tingting Liu, Runtian Zheng, Nengbing Long, Miao Shui, Jie Shu* Faculty of Materials Science and Chemical Engineering, Ningbo University, No. 818 Fenghua Road, Ningbo 315211, Zhejiang Province, People’s Republic of China
1
These authors contributed equally to this work.
* Corresponding author: Jie Shu E-mail:
[email protected] Keyword: Hydrogen potassium titanium niobate; Nanowires; Electrospinning; In situ X-ray diffraction; Lithium-ion batteries.
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Abstract HTiNbO5 has been widely investigated in many fields because of its distinctive properties such as good redox activity, high photocatalytic activity and environmental benignancy.
Here,
this
work
reports
the
synthesis
of
one
dimensional
H0.92K0.08TiNbO5 nanowires via a simple electrospinning followed by an ion-exchange reaction. The H0.92K0.08TiNbO5 nanowires consist of many small “lumps” with a uniform diameter distribution around 150 nm. Used as an anode for lithium ion batteries, H0.92K0.08TiNbO5 nanowires exhibit high capacity, fast electrochemical kinetics and high performance of lithium-ion uptake. A capacity of 144.1 mAh g-1 can be carried by H0.92K0.08TiNbO5 nanowires at 0.5 C in initial charge and even after 150th cycles, the reversible capacity can keep at 123.7 mAh g-1 with an excellent capacity retention of 85.84%. For H0.92K0.08TiNbO5 nanowires, the diffusion coefficient of lithium ions is 1.97×10-11 cm2 s-1, which promotes the lithium-ion uptake effectively. The outstanding electrochemical performance is ascribed to its morphology and the formation of stable phase during cycling. In addition, the in situ X-ray diffraction (XRD) and ex situ transmission electron microscopy (TEM) techniques are applied to reveal its lithium storage mechanism, which prove the structure stability and electrochemical reversibility, thus achieving high performance lithium-ion uptake. All these advantages demonstrate that H0.92K0.08TiNbO5 nanowires can be a possible alternative anode material for rechargeable batteries.
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ACS Applied Materials & Interfaces
1. Introduction For mitigating the threat of energy shortages and environmental deterioration in the coming years, numerous efforts have been made to develop the devices or the systems which can store and converse energy efficiently.1-5 As one of the well-known energy storage devices,6 lithium-ion batteries (LIBs) have drawn widely attention owing to their merits of high energy density, rechargeable power source and low environmental influence and now power a diverse range of equipment and systems, such as electric vehicles and some large-scale energy facilities.7-12 However, the traditional LIBs used graphite as anode material can hardly fulfill the requirements for high rate application.13, 14 One of these problems which restrict their application is the safety issue.15 Since graphite exhibits a low operating voltage (
