期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 155, 期 2, 页码 394-408出版社
ACADEMIC PRESS INC
DOI: 10.1006/jssc.2000.8940
关键词
LiMn2O4; 3.3 V plateau, electrochemistry; TEM
Transmission electron microscopy (TEM) measurements were performed on electrochemically partially delithiated prepared spinel Li1-xMn2O4 samples. The potential-composition profile of LiMn2O4 exhibits (besides the two plateaus at 4.05 and 4.1 V) two additional redox steps of identical capacity at 4.5 and 3.3/3.95 V, We found by TEM studies that these extra steps are the signature of a reversible phase transition between LiMn2O4 spinel type structure and a new Li1-xMn2O4 double hexagonal (DH) type structure (a approximate to 5.8 Angstrom, c approximate to 8.9 Angstrom, P6(3)mc), The latter is isotypic with DH LiFeSnO4. Selected area electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM) made it possible to identify the mechanism by which this cubic-DH phase transition occurs within a particle. Based on the structural findings the origin as well as the similar electrochemical capacity of the 3.3/3.95 and 4.5 V anomalies are explained. (C) 2000 Academic Press.
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