Uracil-based additives for enabling robust interphases of high-voltage Li-ion batteries at elevated temperature by substituent effects

High‐voltage lithium‐ion batteries (LIBs) have attracted great attention due to their promising high energy density. However, severe capacity degradation is witnessed, which originated from the incompatible and unstable electrolyte‐electrode interphase at high voltage. Herein, a robust additive‐induced sulfur‐rich interphase is constructed by introducing an ultrahigh S‐content of 34.04% additive (methylene methyl disulfonate, MMDS) in 4.6 V LiNi0.5Co0.2Mn0.3O2 (NCM523)||graphite pouch cell. The MMDS does not directly participate the inner Li+ sheath, but the strong interactions between MMDS and PF6‐ anions promote the preferential decomposition of MMDS and broaden the oxidation stability, and facilitate the formation of an ultrathin but robust sulfur‐rich interfacial layer. The electrolyte consumption, gas production, phase transformation and dissolution of transition metal ions were effectively inhibited. As expected, the 4.6 V NCM523||graphite pouch cell delivers a high capacity retention of 87.99% even after 800 cycles. This work shares new insight into the sulfur‐rich additive‐induced electrolyte‐electrode interphase for stable high‐voltage LIBs.

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Sulfur‐Rich Additive‐Induced Interphases Enable Highly Stable 4.6 V LiNi_0.5Co_0.2Mn_0.3O₂||graphite Pouch Cells

Fan

Zhou

Qiu

et al. 2023

Angewandte Chemie

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Sulfur‐Rich Additive‐Induced Interphases Enable Highly Stable 4.6 V LiNi_0.5Co_0.2Mn_0.3O₂||graphite Pouch Cells

Fan,

Zhou,

Qiu

et al. 2023

Angew Chem Int Ed

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Norbornenic anhydride as versatile additive optimizing interphases to enable high-performance LiNi0.8Co0.1Mn0.1O2/Li batteries

Yang,

Huang

et al. 2025

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Uracil-based additives for enabling robust interphases of high-voltage Li-ion batteries at elevated temperature by substituent effects

Abstract: Rational chemical structures of solid electrolyte interphase (SEI) films play a key role in high-energy-density batteries, especially working at high-voltage and high-temperature conditions. Herein, uracil (UC) and 2-thiouracil (TUC) as...

Cited by 3 publications

References 51 publications

Sulfur‐Rich Additive‐Induced Interphases Enable Highly Stable 4.6 V LiNi_0.5Co_0.2Mn_0.3O₂||graphite Pouch Cells

Sulfur‐Rich Additive‐Induced Interphases Enable Highly Stable 4.6 V LiNi_0.5Co_0.2Mn_0.3O₂||graphite Pouch Cells

Sulfur‐Rich Additive‐Induced Interphases Enable Highly Stable 4.6 V LiNi_0.5Co_0.2Mn_0.3O₂||graphite Pouch Cells

Norbornenic anhydride as versatile additive optimizing interphases to enable high-performance LiNi0.8Co0.1Mn0.1O2/Li batteries

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Uracil-based additives for enabling robust interphases of high-voltage Li-ion batteries at elevated temperature by substituent effects

Abstract: Rational chemical structures of solid electrolyte interphase (SEI) films play a key role in high-energy-density batteries, especially working at high-voltage and high-temperature conditions. Herein, uracil (UC) and 2-thiouracil (TUC) as...

Cited by 3 publications

References 51 publications

Sulfur‐Rich Additive‐Induced Interphases Enable Highly Stable 4.6 V LiNi0.5Co0.2Mn0.3O2||graphite Pouch Cells

Sulfur‐Rich Additive‐Induced Interphases Enable Highly Stable 4.6 V LiNi0.5Co0.2Mn0.3O2||graphite Pouch Cells

Sulfur‐Rich Additive‐Induced Interphases Enable Highly Stable 4.6 V LiNi0.5Co0.2Mn0.3O2||graphite Pouch Cells

Norbornenic anhydride as versatile additive optimizing interphases to enable high-performance LiNi0.8Co0.1Mn0.1O2/Li batteries

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Product

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Sulfur‐Rich Additive‐Induced Interphases Enable Highly Stable 4.6 V LiNi_0.5Co_0.2Mn_0.3O₂||graphite Pouch Cells

Sulfur‐Rich Additive‐Induced Interphases Enable Highly Stable 4.6 V LiNi_0.5Co_0.2Mn_0.3O₂||graphite Pouch Cells

Sulfur‐Rich Additive‐Induced Interphases Enable Highly Stable 4.6 V LiNi_0.5Co_0.2Mn_0.3O₂||graphite Pouch Cells