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Title: A High Energy–Density, Cobalt–Free, Low–Nickel LiNi0.7Mn0.25Al0.05O2 Cathode with a High–Voltage Electrolyte for Lithium–Metal Batteries

Journal Article · · Advanced Energy Materials

Abstract Cobalt‐free cathode materials have garnered increased attention for applications in next‐generation batteries for electric vehicles, as cobalt is considered to have at a high supply chain risk. Here, the use of a localized saturated electrolyte (LSE) to enable stable cycling of a cobalt‐free, low‐nickel layered‐oxide cathode LiNi 0.7 Mn 0.25 Al 0.05 O 2 (NMA‐70) to higher voltages (4.6 V) in a lithium‐metal battery is demonstrated. Compared to the baseline LP57 electrolyte, the LSE extends the cycle life from ≈100 cycles to ≈400 cycles before reaching 80% capacity retention. Visual indicators of cell degradation, such as product deposition, are observed on electrodes cycled in LP57. It is shown that cycling NMA‐70 in LSE reduces the overall active material loss and overpotential growth during extended cycling. This is attributed to the formation of a beneficial fluorinated interphase layer, a lower degree of rock‐salt phase formation, and a reduction in the gas evolution from the cathode surface. The decrease in gas evolution from the cathode cycled in LSE reflects a lower degree of electrolyte reactivity and an overall improvement in the safety characteristics of the cell. This study highlights the importance of a stable electrolyte to enable the high‐voltage cycling of alternative, lower nickel, and cobalt‐free cathodes.

Research Organization:
University 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); USDOE
Grant/Contract Number:
EE0007762
OSTI ID:
2217456
Alternate ID(s):
OSTI ID: 1971276
Journal Information:
Advanced Energy Materials, Vol. 13, Issue 21; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (18)