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Title: High Voltage LiNi 0.5 Mn 0.3 Co 0.2 O 2 /Graphite Cell Cycled at 4.6 V with a FEC/HFDEC-Based Electrolyte

Journal Article · · Advanced Energy Materials
 [1];  [2];  [3];  [4];  [5];  [6];  [2];  [7];  [2]
  1. Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue Argonne IL 60439-4837 USA; Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road Worcester MA 01609 USA
  2. Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue Argonne IL 60439-4837 USA
  3. School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis OR USA
  4. Applied Physics Program, Northwestern University, Evanston IL 60208 USA
  5. X-Ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue Argonne IL 60439-4837 USA
  6. Applied Physics Program, Northwestern University, Evanston IL 60208 USA; Department of Materials Science and Engineering, Northwestern University, Evanston IL 60208 USA
  7. Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road Worcester MA 01609 USA
+ Show Author Affiliations

A high voltage LiNi0.5Mn0.3Co0.2O2/graphite cell with a fluorinated electrolyte formulation 1.0 m LiPF6 fluoroethylene carbonate/bis(2,2,2-trifluoroethyl) carbonate is reported and its electrochemical performance is evaluated at cell voltage of 4.6 V. Comparing with its nonfluorinated electrolyte counterpart, the reported fluorinated one shows much improved Coulombic efficiency and capacity retention when a higher cut-off voltage (4.6 V) is applied. Scanning electron microscopy/energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy data clearly demonstrate the superior oxidative stability of the new electrolyte. The structural stability of the bulk cathode materials cycled with different electrolytes is extensively studied by X-ray absorption near edge structure and X-ray diffraction.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1389625
Journal Information:
Advanced Energy Materials, Vol. 7, Issue 15; ISSN 1614-6832
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
LiNi0.5Mn0.3Co0.2O2 cathode
electrode/electrolyte interface
fluorinated electrolytes
oxidation stability
post-test analysis