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Title: The Phase Evolution and Degradation Modes of $$ R\overline{3}$$m LixNi1-y-zCoyAlzO2 Electrodes Cycled Near Complete Delithiation

Journal Article · · Chemistry of Materials

We report that the practical utilization of energy densities near the theoretical limit for $$ R\overline{3}m$$ layered oxide positive electrode materials is dependent on the stability of the electrochemical performance of these materials at or near full delithiation. In order to develop new chemistries and novel approaches towards the improvement of the electrochemical performance of these materials at such high states of charge, a robust understanding of the failure mechanisms limiting current materials is necessary. Thorough analysis of LixCo1-yAlyO2 and LixNi1-yAlyO2 as well as LixNi0.8Co0.2O2 and LixNi0.8Co0.15Al0.05O2 (1 ≥ x ≥ 0 and 0.2 ≥ y ≥ 0) enabled the identification of key relationships between the transition metal chemistry of the electrode, its structural stability, and cycling characteristics at or near complete delithiation (4.75 V). Extensive characterization of these materials was achieved by a multitude of physical and electrochemical techniques to investigate the relative importance of surface vs. bulk phenomena. Here, the resulting insights derived from these analyses highlight the importance of the intrinsic structural and mechanical stability of the electrode when highly delithiated and establish guidelines for identifying positive electrode materials with improved high state of charge performance. Lastly, particularly important is the contrasting electrochemical impact of Al substitution into LiCoO2- and LiNiO2-based materials, which is shown to likely arise from the enhanced propensity for Al ions to migrate to the tetrahedral site in Co-rich compounds at high states of delithiation.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Northeastern Center for Chemical Energy Storage (NECCES); Rutgers Univ., New Brunswick, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012583
OSTI ID:
1477223
Journal Information:
Chemistry of Materials, Vol. 30, Issue 21; Related Information: Supplemental information for The Phase Evolution and Degradation Modes of R3 ̅m LixNi1-y-zCoyAlzO2 Electrodes Cycled Near Complete Delithiation; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (3)

Fundamental insights about interlayer cation migration in Li-ion electrodes at high states of charge journal January 2019
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Surface Chemistry Dependence on Aluminum Doping in Ni-rich LiNi0.8Co0.2-yAlyO2 Cathodes. journalarticle January 2019

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