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<p>Nickel-rich layered oxide materials, specifically LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> or NCM811, exhibit exceptional theoretical energy densities, rendering them highly suitable for applications demanding high energy outputs. Their superior specific capacity is a key factor contributing to this suitability. However, the unstable cathode electrolyte interphase (CEI) formed on nickel-rich materials during cycling degrades battery performance by consuming active lithium ions. Stable CEI formation is crucial for improving electrochemical stability. In this study, a novel NO<sub>2</sub>-functionalized methyl benzoate-containing reagent (Methyl 5-Nitro-2-Methylbenzoate MNM) was introduced into a conventional carbonate electrolyte. This combination promoted the in-situ formation of a stable, ion-conductive CEI on the NCM811 electrode. The assembled NCM811||Li battery exhibited excellent cycling stability, delivering a discharge capacity of 163.01 mAh g⁻¹ and maintaining 90.82% of its original capacity after 100 cycles at a 1&#xa0;C rate. Moreover, at a higher charge/discharge rate of 7&#xa0;C, the battery maintained a specific capacity of 136.70 mAh g⁻¹. X-ray photoelectron spectroscopy (XPS) analysis revealed that MNM additives enhanced the conversion of FEC into LiF and Li₃N, improving the CEI membrane’s stability and ion transport. This study presents a novel strategy for designing highly stable electrolyte systems that exhibit ion conductivity, optimized for use in applications with high energy density requirements.</p> Graphical abstract <p></p>

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Nitrogen-containing additive and FEC solvent synergistically modified ion transport electrolyte interfaces for high-performance NCM811 cathodes

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Peisong Liu,
  • Chenxia Tang,
  • Hongmei Shen,
  • Yuqing Zhou,
  • Mingyang Cao,
  • Tao Wei,
  • Weidong Xue,
  • Xiaoli Peng

摘要

Nickel-rich layered oxide materials, specifically LiNi0.8Co0.1Mn0.1O2 or NCM811, exhibit exceptional theoretical energy densities, rendering them highly suitable for applications demanding high energy outputs. Their superior specific capacity is a key factor contributing to this suitability. However, the unstable cathode electrolyte interphase (CEI) formed on nickel-rich materials during cycling degrades battery performance by consuming active lithium ions. Stable CEI formation is crucial for improving electrochemical stability. In this study, a novel NO2-functionalized methyl benzoate-containing reagent (Methyl 5-Nitro-2-Methylbenzoate MNM) was introduced into a conventional carbonate electrolyte. This combination promoted the in-situ formation of a stable, ion-conductive CEI on the NCM811 electrode. The assembled NCM811||Li battery exhibited excellent cycling stability, delivering a discharge capacity of 163.01 mAh g⁻¹ and maintaining 90.82% of its original capacity after 100 cycles at a 1 C rate. Moreover, at a higher charge/discharge rate of 7 C, the battery maintained a specific capacity of 136.70 mAh g⁻¹. X-ray photoelectron spectroscopy (XPS) analysis revealed that MNM additives enhanced the conversion of FEC into LiF and Li₃N, improving the CEI membrane’s stability and ion transport. This study presents a novel strategy for designing highly stable electrolyte systems that exhibit ion conductivity, optimized for use in applications with high energy density requirements.

Graphical abstract