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Related Experiment Video

Updated: Aug 9, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Interface Engineering via Regulating Electrolyte for High-Voltage Layered Oxide Cathodes-Based Li-Ion Batteries.

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Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 22, 2023
PubMed
Summary

Researchers developed a new electrolyte for high-energy lithium-ion batteries (LIBs). This electrolyte stabilizes electrode interfaces, improving performance and durability at high voltages and temperatures.

Keywords:
Li-rich/Ni-rich cathodesgraphite anodeshigh-voltage electrolytesinterface engineeringlithium-ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-energy cathodes like Li-rich and Ni-rich layered oxides face challenges in lithium-ion batteries (LIBs) due to surface reactivity at high voltages (4.7 V).
  • These challenges include interfacial reactions, transition metal dissolution, and gas generation, limiting their practical application.

Purpose of the Study:

  • To develop robust electrode-electrolyte interphases (CEI and AEI) for high-energy LIBs operating at high voltages.
  • To enhance the stability and cycle life of Li-rich and Ni-rich cathodes by suppressing detrimental interfacial reactions.

Main Methods:

  • Constructed inorganic/organic/inorganic-rich CEI and AEI layers using F-, B-, and P-rich components.
  • Formulated a ternary fluorinated lithium salts electrolyte (TLE) by mixing specific concentrations of lithium difluoro(oxalato)borate, lithium difluorophosphate, and lithium hexafluorophosphate.
  • Investigated the effect of modulating frontier molecular orbital energy levels of lithium salts on interphase formation.

Main Results:

  • The robust interphase effectively suppressed electrolyte oxidation and transition metal dissolution.
  • Li-rich and Ni-rich cathodes in TLE demonstrated high-capacity retention (83.3% after 200 and 1000 cycles, respectively) at 4.7 V.
  • Excellent performance was observed at 45 °C, indicating effective inhibition of aggressive interface chemistry at high voltage and temperature.

Conclusions:

  • Modulating frontier molecular orbital energy levels of electrolyte components is a viable strategy to regulate electrode interface composition and structure.
  • The developed TLE and interphases significantly improve the high-voltage and high-temperature performance of next-generation LIBs.
  • This approach offers a pathway to enhance the safety and longevity of high-energy lithium-ion batteries.