Understanding the effect of salt concentrations on fast charging performance of Li-ion cells

Wu, Xianyang; Ma, Lin; Liu, Jue; Zhao, Kejie; Wood, III, David L.; Du, Zhijia

doi:10.1016/j.jpowsour.2022.231863

Title: Understanding the effect of salt concentrations on fast charging performance of Li-ion cells

Journal Article · 06 August 2022 · Journal of Power Sources

DOI: https://doi.org/10.1016/j.jpowsour.2022.231863 · OSTI ID:1883875

Wu, Xianyang ^[1]; Ma, Lin ^[2]; Liu, Jue ^[3]; Zhao, Kejie ^[4]; Wood, III, David L. ^[3];

^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Purdue Univ., West Lafayette, IN (United States)
Univ. of North Carolina, Charlotte, NC (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Purdue Univ., West Lafayette, IN (United States)

Here, 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 LiNi_0.6Mn_0.2Co_0.2O₂ (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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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1883875

Journal Information:: Journal of Power Sources, Journal Name: Journal of Power Sources Vol. 545; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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