Fast Li-Ion Insertion into Nanosized LiMn2O4 without Domain Boundaries

作者：Okubo Masashi; Mizuno Yoshifumi; Yamada Hirotoshi; Kim Jedeok; Hosono Eiji; Zhou Haoshen; Kudo Tetsuichi; Honma Itaru^*

来源：ACS Nano, 2010, 4(2): 741-752.

DOI：10.1021/nn9012065

• Li-ion rechargeable battery
• cathode
• LiMn2O4
• nanosize effect
• domain boundary

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.

• 出版日期2010-2