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Fabrication of Spatially Confined Complex Oxides
Published on: July 1, 2013
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Oxides Induced Preferential Growth of {110} Planes for Superior Performance Single-Crystal LiMn2O4 through
Yuming Shu1,2,3, Hanghang Lei2, Jiangnan Huang1
1College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
The Journal of Physical Chemistry Letters
|August 16, 2024
Summary
Engineered single-crystal lithium manganese oxide (LMO) with specific surface planes overcomes degradation issues. This novel LMO structure demonstrates enhanced stability and electrochemical performance for advanced batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-state Chemistry
Background:
- Polycrystalline lithium manganese oxide (LMO) exhibits surface degradation and electrochemical polarization due to mixed crystal plane orientations.
- Optimizing LMO crystal structure is crucial for improving battery performance and longevity.
Purpose of the Study:
- To engineer a single-crystal LMO with controlled surface planes to enhance electrochemical properties.
- To investigate the effect of specific crystal facets on LMO stability and ion diffusion.
Main Methods:
- Utilized a SrO-induced preferential growth method to synthesize hexagonal prism single-crystal LMO (LMOS-HP).
- Characterized the crystal structure and surface properties of the engineered LMO.
- Evaluated the electrochemical performance, including capacity retention and discharge capacity, through cycling tests.
Main Results:
- The LMOS-HP featured stable {111} top surfaces and fast Li+ diffusion through {110} side surfaces.
- LMOS-HP demonstrated exceptional electrochemical capability with minimal capacity fading (0.021% per cycle over 500 cycles).
- Achieved a discharge capacity of 81.9 mAh g-1 at a high rate of 20C.
Conclusions:
- Tuning the surface crystal orientation of LMO is an effective strategy to mitigate degradation and enhance electrochemical performance.
- The hexagonal prism single-crystal LMO design offers a promising pathway for developing high-performance lithium-ion batteries.
