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Published on: March 7, 2018
Fast Li-Ion insertion into nanosized LiMn(2)O(4) without domain boundaries.
Masashi Okubo1, Yoshifumi Mizuno, Hirotoshi Yamada
1National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8578 Japan.
ACS Nano
|February 2, 2010
Summary
Controlling crystallite size in lithium manganese oxide (LiMn2O4) electrode materials is key for high-power lithium-ion batteries. Smaller crystallites enable faster lithium-ion insertion by altering the material's phase behavior.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- The development of advanced electrode materials is crucial for enhancing the performance of lithium-ion rechargeable batteries.
- Nanostructured materials offer unique properties for energy storage applications, particularly for high-power demands.
Purpose of the Study:
- To systematically investigate the impact of crystallite size on the electrochemical properties of lithium manganese oxide (LiMn2O4).
- To understand how controlling nanocrystal size influences lithium-ion insertion mechanisms and voltage characteristics.
Main Methods:
- Hydrothermal synthesis was employed to achieve precise control over the crystallite size of LiMn2O4 nanoparticles.
- Electrochemical characterization techniques were used to evaluate the performance of LiMn2O4 with varying crystallite sizes.
Main Results:
- Accurate size control of nanocrystalline LiMn2O4 significantly alters its phase diagram and lithium-ion insertion voltage.
- Extremely small crystallites (15 nm) prevent domain boundary formation between Li-rich and Li-poor phases due to interface energy considerations.
- Lithiation in these small crystallites proceeds via a solid-solution mechanism, facilitating rapid lithium-ion insertion throughout the discharge process.
Conclusions:
- Crystallite size is a critical parameter influencing the electrochemical behavior of LiMn2O4 for lithium-ion batteries.
- The absence of domain boundaries in very small LiMn2O4 crystallites enables enhanced lithium-ion kinetics, leading to improved battery performance.
