Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (1): 38-44.doi: 10.19799/j.cnki.2095-4239.2021.0559

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Fast synthesis of Nb2O5 nanosheets derived from Nb2C MXene for lithium ion capacitors

Xin WANG1,2(), Pei HU1, Yuanming ZHOU1, Jinxia XU1, Yan JIANG1()   

  1. 1.School of Science, Hubei University of Technology, Wuhan 430068, Hubei, China
    2.Sinopec Jiang Drilling Petroleum Machinery Co. Ltd. , Wuhan 430000, Hubei, China
  • Received:2021-10-25 Revised:2021-10-27 Online:2022-01-05 Published:2022-01-10
  • Contact: Yan JIANG E-mail:815212957@qq.com;yanjiang@hbut.edu.cn

Abstract:

In recent years, lithium ion capacitors (LICs) attract much attention due to their high power density and relatively high energy density with rapid development of electric vehicles and energy storage. Niobium pentoxide (Nb2O5) is one of the most important anode materials owning to its high capacity and superior rate capability. However, complicated fabrication process or special treatments are required in the synthesis of Nb2O5 based anode material. Herein, a fast synthesis of multilayer Nb2O5 nanosheets by oxidizing the multilayer Nb2C MXene material is developed. The multilayer Nb2O5 nanosheets are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), specific surface area analysis, X-ray photoelectron spectroscopy (XPS) and electrochemical analysis. Initially, the precursor transform into orthorhombic Nb2O5 (T-Nb2O5) which inherit the multilayer nanosheet microstructure. With prolonged sintering time, the orthorhombic phase turns into pseudohexagonal Nb2O5 (TT-Nb2O5) nanoparticles. Compared with TT-Nb2O5 nanoparticles, multilayer T-Nb2O5 nanosheet electrode shows higher specific capacity and better rate capability. The T-Nb2O5 electrode also shows excellent cycle performances both in half-cells and LICs. The excellent lithium storage performances of the multilayer T-Nb2O5 material may be due to the synergistic effect of its multi-layer microstructure, inherent quasi-2D Li-ion channel and rapid pseudocapacitive response.

Key words: energy storage and conversion, LICs, Nb2O5, fast synthesis

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