A High Energy-Density, Cobalt-Free, Low-Nickel LiNi_(0.7)Mn_(0.25)Al_(0.05)O_2 Cathode with a High-Voltage Electrolyte for Lithium-Metal Batteries

Richard Sim; Laisuo Su; Arumugam Manthiram

首页> 外文期刊>Advanced energy materials >A High Energy-Density, Cobalt-Free, Low-Nickel LiNi_(0.7)Mn_(0.25)Al_(0.05)O_2 Cathode with a High-Voltage Electrolyte for Lithium-Metal Batteries

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A High Energy-Density, Cobalt-Free, Low-Nickel LiNi_(0.7)Mn_(0.25)Al_(0.05)O_2 Cathode with a High-Voltage Electrolyte for Lithium-Metal Batteries

机译：A High Energy-Density, Cobalt-Free, Low-Nickel LiNi_(0.7)Mn_(0.25)Al_(0.05)O_2 Cathode with a High-Voltage Electrolyte for Lithium-Metal Batteries

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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.

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《Advanced energy materials》 |2023年第21期|2300096.1-2300096.12|共12页
作者
Richard Sim; Laisuo Su; Arumugam Manthiram;
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Texas Materials Institute The University of Texas at Austin 204 E Dean Keaton Street, Austin, TX 78712, United States;

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正文语种英语
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cobalt-free cathodes; electrochemistry; electrode-electrolyte interface; high voltage electrolytes; lithium-ion batteries;

A High Energy-Density, Cobalt-Free, Low-Nickel LiNi_(0.7)Mn_(0.25)Al_(0.05)O_2 Cathode with a High-Voltage Electrolyte for Lithium-Metal Batteries

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