Reversible Graphite Anode Cycling with PC-Based Electrolytes Enabled by Added Sulfur Trioxide Complexes

Authors

Julien Demeaux
Yingnan Dong
Brett L. Lucht, University of Rhode IslandFollow

Document Type

Article

Date of Original Version

2017

Department

Chemistry

Abstract

Pyridine sulfur trioxide (PyrSO₃), trimethyl amine sulfur trioxide (Me₃NSO₃), and triethyl amine sulfur trioxide (Et₃NSO₃) complexes have been investigated as electrolyte additives for lithium ion batteries. Incorporation of 0.5 to 2.0% of the SO₃ complexes into a PC/EMC (1:1 v/v) 1 M LiPF₆ baseline electrolyte affords reversible cycling of graphite anodes confirming generation of a stable Solid Electrolyte Interphase (SEI). Good cycling performance is observed for graphite/LiNi_0.5Mn_1.5O₄ cells cycled to high potential (4.8 V vs Li) containing PC based electrolyte with added SO₃ complexes. Ex-situ surface analysis via X-ray Photoelectron Spectroscopy (XPS) of the anodes reveals SO₃ complex reduction on the surface of the graphite anode generates a sulfur-based SEI containing sulfites, sulfide, and sulfate species. The presence of the sulfur containing species is likely critical for the stability of the SEI. Ex-situ XPS analyses of the LiNi_0.5Mn_1.5O₄ cathodes suggest that reaction of Me₃NSO₃ or Et₃NSO₃ complexes at high potential result in the generation of a stable passivation layer which affords good capacity retention and coulombic efficiency.

Citation/Publisher Attribution

Demeaux, J., Dong, Y., & Lucht, B. L. (2017). Reversible Graphite Anode Cycling with PC-Based Electrolytes Enabled by Added Sulfur Trioxide Complexes. J. Electrochem. Soc., 164(7), A1352-A1360. doi: 10.1149/2.0171707jes

Available at: http://dx.doi.org/10.1149/2.0171707jes

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This work is licensed under a Creative Commons Attribution 4.0 License.