Journal
JOURNAL OF POWER SOURCES
Volume 545, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231863
Keywords
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Funding
- U.S. Department of Energy (DOE) - Office of Energy Efficiency and Renewable Energy (EERE) Vehicle Technologies Office (VTO) [DE-AC05-00OR22725]
- Office of Energy Efficiency and Renewable Energy (EERE) Vehicle Technologies Office (VTO)
- National Science Foundation [CHE-1531834]
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Different concentrations of lithium salt in carbonate electrolyte were studied on the fast charging performance of LiNi0.6Mn0.2Co0.2O2 (NMC622)/graphite pouch cells. The cells with 1.5 M electrolyte showed the best overall performance in fast charging capacity and long-term cycling.
Different lithium salt (lithium bis(fluorosulfonyl) imide (LiFSI)/LiPF6 9/1 mol ratio) concentrations in carbonate electrolyte were studied on the fast charging performance of LiNi0.6Mn0.2Co0.2O2 (NMC622)/graphite pouch cells. The cells with electrolyte concentration from 0.75 M to 1.50 M showed similar fast charging capabilities. Further increase of the concentration to 1.75 M and 2.00 M decreased the attainable capacity in fast charging. In the long-term cycling test, the capacity retention after 200 fast charging cycles increased with the increase of salt concentration in electrolyte. Cells with 1.5 M electrolyte showed the best overall performance in fast charging capacity and long-term cycling. Li platings were observed in the cells with 0.75 M, 1.00 M and 1.25 M electrolyte. It was improved with greatly reduced Li plating area in 1.50 M, and no Li plating at all in 1.75 M and 2.00 M electrolyte. Post-mortem analysis such as neutron powder diffraction (NPD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the electrode after cycling. It suggests that electrolyte concentration needs to be optimized for a given cell configuration with specific electrode and loading.
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