Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 169, Issue 2, Pages -Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac5302
Keywords
LiNi0 8Mn0 1Co0 1O2 (NMC811); Lithium bis(fluorosulfonyl)imide (LiFSI); lithium ion batteries; heat treatment; cycling stability
Funding
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office
- U.S. Department of Energy [DEEE0009110]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC05-00OR22725]
- UT-Battelle, LLC [DEAC05-00OR22725]
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High nickel content layered oxide LiNi0.8Mn0.1Co0.1O2 (NMC811) cathode material, with high theoretical capacity, was treated in a LiFSI/DMC solution to enhance its cycling stability and capacity by coating the surface with LiF layer due to the reaction of residual lithium salts and LiFSI.
High nickel content layered oxide LiNi0.8Mn0.1Co0.1O2 (NMC811) is a promising cathode material with a high theoretical capacity of 200 mAh g(-1) for use in high energy density lithium-ion batteries. However, its surface can easily get passivated by LiOH and Li2CO3 due to its surface residual Li2O being reacting with ambient moisture and CO2. Herein, NMC811 was treated in a 3.0 M solution of lithium bis(fluorosulfonyl)imide (LiFSI) in dimethyl carbonate (DMC) at 60 degrees C for 8 h, 16 h and 24 h, respectively, resulting in coating of the NMC811 surface with LiF due to the basic nature of those residual lithium salts that react with LiFSI. The facile treatment of NMC811 in LiFSI/DMC not only improves the cycling stability but also enhances the capacity of the Li/NMC811 cells, mainly because of the thinning of the Li2CO3 layer as suggested by cyclic voltammograms and impedance analyses. This method opens a new avenue for activation of passivated NMC811 particles for practical battery applications.
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