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Engineering Cathode-Electrolyte Interface of High-Voltage Spinel LiNi0.5Mn1.5O4 via Halide Solid-State Electrolyte
Jheng-Yi Huang1, Ching-Yun Cheng2, Yan-Ming Lai1
1Department of Chemistry and Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 106, Taiwan.
ACS Applied Materials & Interfaces
|August 16, 2023
Summary
Researchers developed a protective coating for LiNi₀.₅Mn₁.₅O₄ (LNMO) cathodes to improve battery performance. This coating prevents electrolyte reactions, enhancing cycle life and capacity retention for advanced energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- High-voltage spinel LiNi₀.₅Mn₁.₅O₄ (LNMO) offers high energy density and rate capability.
- Electrolyte side reactions and manganese dissolution limit LNMO performance in lithium-ion batteries.
Purpose of the Study:
- To enhance the electrochemical performance and stability of LNMO cathode materials.
- To mitigate oxidative side reactions between LNMO and organic electrolytes.
Main Methods:
- Sol-gel method used to synthesize Li₃InCl₆ (LIC)-coated LNMO (LIC@LNMO).
- Characterization of the protective effect of the halide-type solid-state electrolyte coating.
Main Results:
- The LIC@LNMO coating effectively prevented direct contact between LNMO and the liquid electrolyte.
- 5 wt% LIC@LNMO demonstrated excellent cycle performance: 99% Coulombic efficiency and 80% capacity retention after 230 cycles at 1C.
- The coating maintained good ionic conductivity.
Conclusions:
- The Li₃InCl₆ coating is a promising strategy to stabilize high-voltage LNMO cathodes.
- This approach significantly improves the cycle life and electrochemical stability of LNMO for next-generation batteries.
