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Title: The Role of Additives in Improving Performance in High Voltage Lithium-Ion Batteries with Potentiostatic Holds

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0471701jes· OSTI ID:1391738
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In this work, various electrolyte additives designed for enhanced performance at high voltages were evaluated with elevated temperature potentiostatic holds with LiNi0.5Co0.2Mn0.3/Li4Ti5O12 full cells to determine their effect on the high voltage stability. Of the additives investigated, many showed increased oxidation current through the 60 hour potentiostatic holds test, and adversely affected both the capacity retention and interfacial impedance. Improved high voltage performance was observed with two additives, vinylene carbonate (VC) and 1,1,2,2- tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE), which was attributed to two different mechanisms of improvement. This work challenges some conclusions in the available literature that an additive molecule that decomposes on the charged cathode surface and passivates the surface against electrolyte oxidation.

Research Organization:
Argonne National Laboratory (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:
1391738
Journal Information:
Journal of the Electrochemical Society, Vol. 164, Issue 1; ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English

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