Journal
ADVANCED ENERGY MATERIALS
Volume 13, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202202993
Keywords
air instability; cathode active materials; large-scale application; Ni-rich layered oxides; storage evolution behavior
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This review comprehensively and critically explores the issue of air instability in Ni-rich layered oxides and reviews various modification strategies. The authors propose further research and provide perspectives for achieving practical applications of Ni-rich layered oxides.
Benefiting from the excellent lithium ions diffusion kinetics and considerable discharge specific capacity, Ni-rich layered oxides have become the preferred selection cathode active materials (CAMs) for high energy density Li-ion batteries. However, due to the distinctive electronic structure of nickel ions (Ni2+/3+/4+) and the strict criteria for sintering conditions, the Ni-rich CAMs inherently suffer from notorious deterioration when in contact with the ambient air. This review provides a comprehensive and critical overview of air instability for Ni-rich CAMs, a neglected but critical issue for large-scale application. The fundamental understanding of derivation of air instability and characterizations is first given, followed by a discussion of evolution behaviors and the corresponding negative influence on fabricating properties of electrodes and electrochemical/safety performance of batteries. Afterward, various material modification strategies for improving air storage stability including pre-treatment by doping and coating and post-treatment by gas, wash, and heat are overviewed. Finally, some perspectives for further exploration to address the air instability issue and pave ways toward Ni-rich CAMs' practical applications are also proposed.
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