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Title: Na-Ion Intercalation and Charge Storage Mechanism in Two-Dimensional Vanadium Carbide

We synthesized two-dimensional vanadium carbide MXene containing surface functional groups (denoted as V 2CT x, where T x are surface functional groups) and studied as anode material for Na-ion batteries. V 2CT x anode exhibits reversible charge storage with good cycling stability and high rate capability through electrochemical test. Furthermore, the charge storage mechanism of V 2CT x material during Na + intercalation/deintercalation and the redox reaction of vanadium were studied using a combination of synchrotron based X-ray diffraction (XRD), hard X-ray absorption near edge spectroscopy (XANES) and soft X-ray absorption spectroscopy (sXAS). Experimental evidence of a major contribution of redox reaction of vanadium to the charge storage and the reversible capacity of V 2CT x during sodiation/desodiation process have been provided through V K-edge XANES and V L2,3-edge sXAS results. A correlation between the CO 3 2- content and Na + intercalation/deintercalation states in the V 2CT x electrode observed from C and O K-edge in sXAS results imply that some additional charge storage reactions may take place between the Na +-intercalated V 2CT x and the carbonate based non-aqueous electrolyte. Our results of this study will provide valuable information for the further studies on V 2CT x asmore » anode material for Na-ion batteries and capacitors.« less
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [4] ;  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Division
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  3. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
  4. Drexel Univ., Philadelphia, PA (United States). Dept.of Materials Science and Engineering, A.J Drexel Nanomaterials Inst.
  5. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
Publication Date:
Report Number(s):
BNL-113977-2017-JA
Journal ID: ISSN 1614-6832; R&D Project: MA453MAEA; VT1201000
Grant/Contract Number:
SC00112704; AC02-05CH11231; AC02-06CH11357; AC02-76SF00515; SC0012704
Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Name: Advanced Energy Materials; Journal ID: ISSN 1614-6832
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; MXene; vanadium carbide; sodium-ion battery; charge storage; X-ray absorption spectroscopy
OSTI Identifier:
1366345
Alternate Identifier(s):
OSTI ID: 1401559