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Unveiling the Stabilities of Nickel–Based Layered Oxide Cathodes at an Identical Degree of Delithiation in Lithium–Based Batteries

Journal Article · · Advanced Materials
 [1];  [2];  [2]
  1. Univ. of Texas, Austin, TX (United States); University of Texas at Austin
  2. Univ. of Texas, Austin, TX (United States)

Bulk, surface, and interfacial instabilities that impact the cycle and thermal performances are the major challenges with high-energy-density LiNi1–x–yMnxCoyO2 (NMC) cathodes with high nickel contents. It is generally believed that the instabilities and performance losses become exponentially aggravated as the nickel content increases. Disparate from this prevailing belief, it is herein demonstrated that NMC cathodes with higher Ni contents may imply better overall stability than “lower-Ni” cathodes under an identical degree of delithiation (charging) conditions. With two representative cathodes, LiNi0.8Mn0.1Co0.1O2 and LiNiO2, a systematic investigation into their stabilities with control of the degree of delithiation is presented. Electrochemical tests indicate that LiNiO2 displays better cyclability than LiNi0.8Mn0.1Co0.1O2 at the same delithiation state. Comprehensive structural and interphase investigations unveil that the inferior cyclability of LiNi0.8Mn0.1Co0.1O2 predominantly results from aggravated parasitic reactions, and the interphase stability may be more critical than lattice stability in dictating cyclability. Also, LiNiO2 delivers similar or better thermal behavior than LiNi0.8Mn0.1Co0.1O2. Finally, the findings demonstrate a strong correlation of the stability of NMC cathodes to the degree of delithiation state rather than the Ni content itself, highlighting the importance of reassessing the true implications of Ni content and structural and interphasial tuning on the stabilities of NMC cathodes.

Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); National Science Foundation (NSF)
Grant/Contract Number:
EE0007762
OSTI ID:
2217345
Alternate ID(s):
OSTI ID: 1805098
OSTI ID: 1848568
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 32 Vol. 33; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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