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Surface Passivation of LiCoO2 by Solid Electrolyte Nanoshell for High Interfacial Stability and Conductivity.
Jun Peng1,2, Hao Peng1, Chen-Guang Shi1
1College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen, 361005, P. R. China.
Chemsuschem
|September 3, 2023
Summary
We developed a novel core@double-shell structured lithium cobalt oxide (LiCoO2) cathode material. This advanced material enhances stability and performance for high-voltage lithium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- High-voltage application of lithium cobalt oxide (LiCoO2) cathodes is limited by surface instability and electrolyte side reactions.
- Developing stable cathode materials is crucial for next-generation high-performance lithium-ion batteries.
Purpose of the Study:
- To engineer a multifunctional hierarchical core@double-shell structured LiCoO2 (MS-LCO) cathode material.
- To improve the electrochemical performance and stability of LiCoO2 cathodes at high voltages.
Main Methods:
- Scalable sol-gel method for synthesizing the MS-LCO cathode.
- Fabrication of a core@double-shell structure with a LiCoO2 core, a La/Zr co-doped inner shell, and a fast ion-conducting outer shell.
- Electrochemical testing in half-cells with liquid electrolyte and in solid-state lithium batteries with PEO-based electrolytes.
Main Results:
- The MS-LCO cathode demonstrated excellent cycling stability, retaining 163.1 mAh g-1 after 500 cycles at 0.5 C.
- Achieved a high specific capacity of 166.8 mAh g-1 at 2 C.
- Solid-state batteries with MS-LCO cathodes retained 85.8% capacity after 150 cycles at 4.3 V, suppressing electrolyte decomposition.
Conclusions:
- The hierarchical core@double-shell structure effectively passivates the LiCoO2 surface, preventing electrolyte decomposition and cobalt loss.
- The MS-LCO cathode exhibits superior structural integrity and electrochemical performance at high voltages.
- This surface passivation strategy is promising for developing stable and high-performance LiCoO2 cathodes for advanced energy storage applications.
