The role of ethylene carbonate (EC) and tetramethylene sulfone (SL) in the dissolution of transition metals from lithium-ion cathodes

Tesfamhret, Yonas; Liu, Haidong; Berg, Erik J.; Younesi, Reza

doi:10.1039/d3ra02535g

Cited by 3 publications

(1 citation statement)

References 54 publications

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“…For more Ni-rich NMCs such as NMC811, the onset of significant RSL formation occurs at lower potentials vs Li/Li + , , with the accompanying release of reactive 1 O 2 implicated in chemical oxidation of solvent components of the electrolyte. ,,,, The associated formation of acidic species ,− has been linked to transition metal (TM) dissolution from the cathode into the electrolyte and subsequent incorporation into the solid electrolyte interphase (SEI) on the anode, ,,,− processes that are expected to be more prominent for Ni-rich NMCs and EC-containing electrolytes. Understanding the role of the electrolyte in these interfacial degradation mechanisms is critical to improving the cycle life of Ni-rich NMC cells to realize practical improvements in LIB energy density.…”

Section: Introductionmentioning

confidence: 99%

Role of Salt Concentration in Stabilizing Charged Ni-Rich Cathode Interfaces in Li-Ion Batteries

Phelan,

Björklund,

Singh

et al. 2024

Chem. Mater.

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The cathode–electrolyte interphase (CEI) in Li-ion batteries plays a key role in suppressing undesired side reactions while facilitating Li-ion transport. Ni-rich layered cathode materials offer improved energy densities, but their high interfacial reactivities can negatively impact the cycle life and rate performance. Here we investigate the role of electrolyte salt concentration, specifically LiPF6 (0.5–5 m), in altering the interfacial reactivity of charged LiN0.8Mn0.1Co0.1O2 (NMC811) cathodes in standard carbonate-based electrolytes (EC/EMC vol %/vol % 3:7). Extended potential holds of NMC811/Li4Ti5O12 (LTO) cells reveal that the parasitic electrolyte oxidation currents observed are strongly dependent on the electrolyte salt concentration. X-ray photoelectron and absorption spectroscopy (XPS/XAS) reveal that a thicker Li x PO y F z -/LiF-rich CEI is formed in the higher concentration electrolytes. This suppresses reactions with solvent molecules resulting in a thinner, or less-dense, reduced surface layer (RSL) with lower charge transfer resistance and lower oxidation currents at high potentials. The thicker CEI also limits access of acidic species to the RSL suppressing transition-metal dissolution into the electrolyte, as confirmed by nuclear magnetic resonance (NMR) spectroscopy and inductively coupled plasma optical emission spectroscopy (ICP-OES). This provides insight into the main degradation processes occurring at Ni-rich cathode interfaces in contact with carbonate-based electrolytes and how electrolyte formulation can help to mitigate these.

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Section: Introductionmentioning

confidence: 99%

Role of Salt Concentration in Stabilizing Charged Ni-Rich Cathode Interfaces in Li-Ion Batteries

Phelan,

Björklund,

Singh

et al. 2024

Chem. Mater.

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Li-ion storage chemistry of metal layers influences on metal oxides

Li,

Liu,

Jiang

et al. 2024

Journal of Alloys and Compounds

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Ethyl Isopropyl Sulfone Modulating to Achieve Stable High-Voltage Electrolyte for Lithium-Ion Batteries

Li,

Hao,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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The demand for efficient large-scale energy storage necessitates high-energy-density batteries, making research on high-voltage electrolytes particularly important. In this article, ethyl isopropyl sulfone (ES), which has a high dielectric constant, is added to traditional carbonate-based electrolyte solvents and analyzed. Based on calculated and analyzed results, different proportions of ES are added to the conventional carbonate-based electrolyte. The high-voltage performance, the influence on the surface of the electrode, the active material structure after cycling, the electrochemical behavior, and the impedance of the electrode were studied systematically. As a result, ES addition is applied in high-voltage lithium-ion batteries and exhibits excellent electrochemical properties. These results will provide support for the research and application of sulfone additives in increasing the decomposition voltage of lithium-ion battery electrolytes and improving battery cycle stability.

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The role of ethylene carbonate (EC) and tetramethylene sulfone (SL) in the dissolution of transition metals from lithium-ion cathodes

Abstract: Transition metal (TM) dissolution, a direct consequence of cathode–electrolyte interactivity, triggers cathode redox active component dissolution as well as modifies solid electrolyte interphase (SEI) on the counter electrode.

Cited by 3 publications

References 54 publications

Role of Salt Concentration in Stabilizing Charged Ni-Rich Cathode Interfaces in Li-Ion Batteries

Role of Salt Concentration in Stabilizing Charged Ni-Rich Cathode Interfaces in Li-Ion Batteries

Li-ion storage chemistry of metal layers influences on metal oxides

Ethyl Isopropyl Sulfone Modulating to Achieve Stable High-Voltage Electrolyte for Lithium-Ion Batteries

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