Artikel,

Fast Li-Ion Insertion into Nanosized LiMn2O4 without Domain Boundaries

, , , , , , , und .
ACS Nano, 4 (2): 741-752 (2010)PMID: 20112930.
DOI: 10.1021/nn9012065

Zusammenfassung

The effect of crystallite size on Li-ion insertion in electrode materials is of great interest recently because of the need for nanoelectrodes in higher-power Li-ion rechargeable batteries. We present a systematic study of the effect of size on the electrochemical properties of LiMn2O4. Accurate size control of nanocrystalline LiMn2O4, which is realized by a hydrothermal method, significantly alters the phase diagram as well as Li-ion insertion voltage. Nanocrystalline LiMn2O4 with extremely small crystallite size of 15 nm cannot accommodate domain boundaries between Li-rich and Li-poor phases due to interface energy, and therefore lithiation proceeds via solid solution state without domain boundaries, enabling fast Li-ion insertion during the entire discharge process.

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