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Investigation of Conductivity and Ionic Transport of VO2(M) and VO2(R) via Electrochemical Study

Journal Article · · Chemistry of Materials
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  1. Stony Brook Univ., Stony Brook, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Stony Brook Univ., Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
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Vanadium dioxides exist as a variety of polymorphs, each with differing structural and electrochemical capabilities. The monoclinic to rutile transition is an interesting system for study as the transition temperature is easily accessible at moderate temperature and corresponds to an increase in electrical conductivity by two orders of magnitude. The transition from monoclinic to rutile is characterized structurally herein using synchrotron-based x-ray diffraction and related to lithium ion electrochemistry using electrochemical impedance spectroscopy and intermittent pulsatile galvanostatic discharge tests. The experimental results indicate a decrease in ohmic resistance for lithium-based cells tested under higher temperatures. Complementary density functional theory calculations described the experimentally measured intercalation voltages and identified a possible Li-induced LixVO2(M) to LixVO2(R) phase transition during the discharging process rationalizing the favorable impact on the function of a lithium based electrochemical cell. Here, to our knowledge, this is the first observation of the metal—insulator transition of VO2 in a full electrochemical cell.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Mesoscale Transport Properties (m2mt)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1487254
Report Number(s):
BNL--209756-2018-JAAM
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 21 Vol. 30; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (9)

Figure 1(p. 7)figure Figure 1
Figure 2(p. 7)figure Figure 2
Figure 3.(p. 9)figure Figure 3.
Figure 4(p. 10)figure Figure 4
Figure 5(p. 12)figure Figure 5
Figure 6(p. 13)figure Figure 6
Figure 7(p. 14)figure Figure 7
Table 1(p. 15)table Table 1
Figure 8(p. 17)figure Figure 8

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