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Title: Relationship of Chemical Composition and Moisture Sensitivity in LiNixMnyCo1-x-yO2 for Lithium-Ion Batteries

Journal Article · · Journal of Electrochemical Energy Conversion and Storage
DOI:https://doi.org/10.1115/1.4051208· OSTI ID:1878158
 [1];  [1];  [1];  [1];  [2];  [1]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
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Chemical composition–moisture sensitivity relationship of LiNixMnyCo1-x-yO2 (NMC) cathode materials was investigated by exploring crystal structures, surface properties, and electrochemical performance behaviors of various commercial NMC powders: LiNi1/3Mn1/3Co1/3O2 (NMC111), LiNi0.5Mn0.3Co0.2O2 (NMC532), LiNi0.6Mn0.2Co0.2O2 (NMC622), and LiNi0.8Mn0.1Co0.1O2 (NMC811). The NMC powders were stored in different moisture conditions: moisture-free, humidified air, or immersed in water. Rietveld refinement analysis of X-ray diffraction (XRD) data and scanning electron microscopy (SEM) were used to characterize the crystal structure changes and the evolution of particle surfaces morphologies. The effect of moisture contamination on the electrochemical properties of NMC cathodes was studied by galvanostatic cycling and electrochemical impedance spectroscopy (EIS). The moisture contamination resulted in either structural disorder or unwanted surficial deposition products, which increased a charge-transfer impedance and consequent performance degradation of battery cells. The results showed that NMC’s moisture vulnerability increased with Ni content (x) despite protective coatings on commercial particles, which stressed the necessity of alternative surface passivation strategies of Ni-rich NMC for broad applications such as electric vehicles and electrified aircraft propulsion.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; The Ohio State University Institute for Materials Research
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1878158
Journal Information:
Journal of Electrochemical Energy Conversion and Storage, Vol. 18, Issue 4; ISSN 2381-6872
Publisher:
ASMECopyright Statement
Country of Publication:
United States
Language:
English

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