Abstract
Preformation of graphite electrodes, in a highly fluorinated electrolyte, show exemplary performance when incorporated into LiNi0.5Mn0.3Co0.2O2//graphite cells (NMC//Gr) containing a traditional organic electrolyte. NMC//Gr cells, using preformed graphite electrodes, showed enhanced capacity and power retention as well as improved coulombic efficiencies. The increased performance was only observed with the use of specific electrolytes during the preforming step, where graphite electrodes, when preformed with the baseline organic carbonate electrolyte, did not show the same benefits. The identity of the preforming electrolyte was also observed to influence electrode crosstalk, where compounds generated at one electrode can affect the opposite electrode. The work herein presents both physical and electrochemical evidence of electrode crosstalk and reveals the beneficial effect of the preforming procedure in limiting the associated degradation mechanisms thereof. The insights gained may lead to new methodologies for the design of electrochemically robust interfaces that can enable high-voltage, lithium-ion batteries.
| Original language | English |
|---|---|
| Pages (from-to) | A3360-A3368 |
| Journal | Journal of the Electrochemical Society |
| Volume | 165 |
| Issue number | 14 |
| DOIs | |
| State | Published - 2018 |
| Externally published | Yes |
Funding
The authors thank J. Gilbert for his assistance with the baseline electrolyte performance. We also thank D. Graczyk and Y. Tsai for ICP-MS analysis of our samples, which was conducted at Argonne’s Analytical Chemistry Laboratory. The electrodes used in this article were fabricated at Argonne’s Cell Analysis, Modeling and Prototyping (CAMP) Facility. Support from the Vehicle Technologies Office (VTO), Hybrid Electric Systems Program, David Howell (Manager), Battery R&D, Peter Faguy (Technology Manager), at the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, is gratefully acknowledged. The CAMP Facility is fully supported by the VTO within the core funding of the Applied Battery Research (ABR) for Transportation Program. The submitted manuscript has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | |
| Office of Energy Efficiency and Renewable Energy | |
| Vehicle Technologies Office |
