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Title: Using the Charge-Discharge Cycling of Positive Electrode Symmetric Cells to Find Electrolyte/Electrode Combinations with Minimum Reactivity

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.1711713jes· OSTI ID:1469346
 [1];  [2];  [2];  [3];  [4];  [5]
  1. Xiamen Univ., Xiamen, (China). Dept. of Chemistry; Dalhousie Univ., Halifax (Canada). Dept. of Physics and Atmospheric Science
  2. Dalhousie Univ., Halifax (Canada). Dept. of Chemistry
  3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  4. Xiamen Univ., Xiamen, (China). Dept. of Chemistry
  5. Dalhousie Univ., Halifax (Canada). Dept. of Physics and Atmospheric Science; Dalhousie Univ., Halifax (Canada). Dept. of Chemistry
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The effects of solvents, salts, electrolyte additives and surface coatings on LiNi0.4Mn0.4Co0.2O2 (NMC442) or LiNi0.6Mn0.2Co0.2O2 (NMC622) have been probed using positive electrode Li-ion symmetric cells coupled with dV/dQ analysis. A robust symmetric cell design is presented which prevents hardware corrosion for over at least 800 hours of testing to 4.5 V vs. Li/Li+ at 40°C. Positive electrode symmetric cells using uncoated positive electrode materials and 1M LiPF6 EC:EMC 3:7 or 1M LiPF6 EMC electrolyte rapidly developed high impedance and showed poor capacity retention. However, if 1% pyridine boron trifluoride (PBF) was added to these electrolytes, cell performance was dramatically improved. Replacing LiPF6 by LiBF4 in the electrolytes above, with or without PBF, yielded positive electrode symmetric cells with good capacity retention. Two types of surface coatings were explored on NMC622 positive electrodes. Cells using surface-coated positive electrodes demonstrated better capacity retention for all electrolytes compared to cells without surface coatings. Finally, this work can be used as a guide by those attempting to find electrolyte/electrode pairs suitable for use in NMC/graphite cells that can operate with long lifetime to 4.5 V.

Research Organization:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
1469346
Journal Information:
Journal of the Electrochemical Society, Vol. 164, Issue 13; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (6)

Temperature Dependence of Electrochemical Degradation in LiNi 1/3 Mn 1/3 Co 1/3 O 2 /Li 4 Ti 5 O 12 Cells journal June 2019
Long-term chemothermal stability of delithiated NCA in polymer solid-state batteries journal January 2019
Design of Positive Electrodes for Li-Ion Full Cells with Silicon journal January 2018
The Effect of Methyl Acetate, Ethylene Sulfate, and Carbonate Blends on the Parasitic Heat Flow of NMC532/Graphite Lithium Ion Pouch Cells journal January 2018
A Tale of Two Additives: Effects of Glutaric and Citraconic Anhydrides on Lithium-Ion Cell Performance journal January 2019
Long-Term Chemothermal Stability of Delithiated NCA in Polymer Solid-State Batteries text January 2019

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Related Subjects

25 ENERGY STORAGE
electrolyte/electrode reactions
high voltage Li-ion cells
symmetric cells