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Title: Enabling fast charging of high energy density Li-ion cells with high lithium ion transport electrolytes

Journal Article · · Electrochemistry Communications

Enabling fast charging capability of high energy density Li-ion cells could dramatically increase the widespread adoption of battery electric vehicles. However, fast charging is limited by Li ion depletion in the electrolyte and increasing Li ion transport from cathode to anode is essential. By evaluating different Li salts in the electrolyte, we find lithium bis(fluorosulfonyl)imide (LFSI) has both higher conductivity and higher Li ion transference number compared to the traditional LiPF6 salt. In a 12-minute charge, the electrolyte with LiPF6 salt reaches the cut-off voltage rapidly while the one with LiFSI exhibits a longer constant current charge with more capacity achieved. The LiFSI electrolyte also reflects better cycling performance and less Li plating after repeated fast charging cycles.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1547450
Alternate ID(s):
OSTI ID: 1523728
Journal Information:
Electrochemistry Communications, Vol. 103, Issue C; ISSN 1388-2481
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Zinc Sulfide Decorated on Nitrogen‐Doped Carbon Derived from Metal‐Organic Framework Composites for Highly Reversible Lithium‐Ion Battery Anode journal October 2019
Identifying rate limitation and a guide to design of fast‐charging Li‐ion battery journal December 2019
In Situ Measurement of Lithium-Ion Cell Internal Temperatures during Extreme Fast Charging journal January 2019
Elucidation of Separator Effect on Energy Density of Li-Ion Batteries journal January 2019

Figures / Tables (5)