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Updated: Jun 11, 2025
11:04
Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
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Enhanced Cycle Stability of LiNiO2 in a Highly Concentrated Ionic Liquid Electrolyte
Huazhen Liu1, Hiroki Maeda1, Jinkwang Hwang1
1Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan.
ACS Applied Materials & Interfaces
|September 28, 2024
Summary
Ionic liquids with bis(fluorosulfonyl)amide salts improve lithium nickel oxide battery performance by suppressing nickel dissolution and side reactions. This LiPF6-free electrolyte enhances cycle stability for next-generation vehicle batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Lithium nickel oxide (LiNiO2) is a cost-effective cathode material for advanced batteries, but suffers from poor cycle life due to nickel dissolution.
- Hydrogen fluoride (HF) from LiPF6 electrolytes reacts with LiNiO2, causing performance degradation.
Purpose of the Study:
- To investigate LiPF6-free ionic liquid electrolytes for improved LiNiO2 cathode stability.
- To understand the role of electrolyte composition in mitigating parasitic reactions and enhancing battery performance.
Main Methods:
- Synthesized and tested ionic liquids with Li[FSA] salts as electrolytes for Li/LiNiO2 cells.
- Conducted electrochemical cycling tests to evaluate capacity retention and cycle life.
- Performed material characterizations to analyze the cathode electrolyte interphase (CEI) and electrode stability.
Main Results:
- Ionic liquid electrolytes significantly enhanced cycle performance, achieving 73.1% capacity retention after 500 cycles.
- A stable CEI formed on the LiNiO2 electrode, suppressing Ni dissolution and structural degradation.
- The electrolyte effectively mitigated aluminum current collector corrosion at high potentials.
Conclusions:
- LiPF6-free ionic liquids, particularly with Li[FSA] salts, offer a promising alternative for stable LiNiO2 cathodes.
- Optimizing electrolyte composition is crucial for addressing stability issues in high-energy density batteries.
- This research contributes to developing safer and more durable next-generation electric vehicle batteries.
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