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Title: Uniform second Li ion intercalation in solid state ϵ-LiVOPO4

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4960452· OSTI ID:1387944
 [1];  [2];  [3];  [4];  [5];  [1];  [5];  [6];  [3];  [3];  [7];  [7];  [4];  [3];  [5]; ORCiD logo [8]
  1. Binghamton Univ., NY (United States). Dept. of Physics, Applied Physics and Astronomy
  2. Binghamton Univ., NY (United States). Materials Science and Engineering
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  4. Univ. of California, San Diego, CA (United States). Dept. of NanoEngineering
  5. Binghamton Univ., NY (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  7. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
  8. Binghamton Univ., NY (United States). Dept. of Physics, Applied Physics and Astronomy, and Materials Science and Engineering

Full, reversible intercalation of two Li+ has not yet been achieved in promising VOPO4 electrodes. A pronounced Li+ gradient has been reported in the low voltage window (i.e., second lithium reaction) that is thought to originate from disrupted kinetics in the high voltage regime (i.e., first lithium reaction). Here, we employ a combination of hard and soft x–ray photoelectron and absorption spectroscopy techniques to depth profile solid state synthesized LiVOPO4 cycled within the low voltage window only. Analysis of the vanadium environment revealed no evidence of a Li+ gradient, which combined with almost full theoretical capacity confirms that disrupted kinetics in the high voltage window are responsible for hindering full two lithium insertion. Furthermore, we argue that the uniform Li+ intercalation is a prerequisite for the formation of intermediate phases Li1.50VOPO4 and Li1.75VOPO4. The evolution from LiVOPO4 to Li2VOPO4 via the intermediate phases is confirmed by direct comparison between O K–edge absorption spectroscopy and density functional theory.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Northeastern Center for Chemical Energy Storage (NECCES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001294; AC02-05CH11231; SC0012583
OSTI ID:
1387944
Alternate ID(s):
OSTI ID: 1282420
Journal Information:
Applied Physics Letters, Vol. 109, Issue 5; Related Information: NECCES partners with Stony Brook University (lead); Argonne National Laboratory; Binghamton University; Brookhaven National University; University of California, San Diego; University of Cambridge, UK; Lawrence Berkeley National Laboratory; Massachusetts Institute of Technology; University of Michigan; Rutgers University; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (5)

On the Balance of Intercalation and Conversion Reactions in Battery Cathodes journal April 2018
A Two-Color Beamline for Electron Spectroscopies at Diamond Light Source journal July 2018
Evidence of a second-order Peierls-driven metal-insulator transition in crystalline NbO 2 journal July 2019
Idea of thin-film beam splitters for two-colour beamlines journal August 2019
On the Balance of Intercalation and Conversion Reactions in Battery Cathodes text January 2018