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Title: Stabilizing the Interphase in Cobalt–Free, Ultrahigh–Nickel Cathodes for Lithium–Ion Batteries

Journal Article · · Advanced Functional Materials

Abstract High‐nickel layered oxide cathodes, such as LiNi 1‐ x y Mn x Co y O 2 (NMC) and LiNi 1‐ x y Co x Al y O 2 (NCA), are at the forefront for implementation in high‐energy‐density lithium‐ion batteries. The presence of cobalt in both cathode chemistries, however, largely deters their application due to fiscal and humanitarian issues affiliated with cobalt sourcing. Increasing the Ni content drives down the Co content, but introduces additional structural and electrochemical problems attributed to high‐Ni cathodes. Herein a dually modified cobalt‐free ultrahigh‐nickel cathode 0.02B‐LiNi 0.99 Mg 0.01 O 2 (NBM) is presented with 1 mol% Mg and 2 mol% B that exhibits a high initial 1C discharge capacity of 210 mA h g −1 with a 20% capacity retention improvement over 500 cycles when benchmarked against LiNiO 2 (LNO) in pouch full cell configurations with graphite anode. Postmortem analyses reveal the enhanced performance stems from reduced active lithium inventory loss and localized surface reactivity in the NBM cathode. The stabilized cathode‐electrolyte interphase subsequently reduces transition‐metal dissolution and ensuing chemical crossover to the graphite anode, which prevents further catalyzed parasitic reactions that harmfully passivate the anode surface. Altogether, this study aims to highlight the importance of electrode characterization and analysis from an interphasial viewpoint and to push the ongoing research to stabilize cobalt‐free ultrahigh‐Ni cathodes for industrial feasibility.

Research Organization:
Univ. of Texas at Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); Welch Foundation; USDOE
Grant/Contract Number:
EE0008445; F-1254; DE‐EE0008445
OSTI ID:
1972451
Alternate ID(s):
OSTI ID: 1983548
Journal Information:
Advanced Functional Materials, Vol. 33, Issue 14; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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