Synthesis, structure and electrochemistry of Ag-modified LiMn{sub 2}O{sub 4} cathode materials for lithium-ion batteries

Journal Article · Mon Aug 04 04:00:00 EDT 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2007.08.013· OSTI ID:21144089

Wenjia, Zhou; Benlin, He ^[1]

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1. College of Chemistry and Chemical Engineering of Lanzhou University, Lanzhou 730000 (China)

Spinel lithium manganese oxide was prepared by sol-gel method and a series of Ag/LiMn{sub 2}O{sub 4} composites with different Ag additive contents were prepared by thermal decomposition of AgNO{sub 3} added to the pure LiMn{sub 2}O{sub 4} powders. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive analysis of X-ray (EDAX) and various electrochemical measurement methods were used to examine the structural and electrochemical characteristics of the Ag/LiMn{sub 2}O{sub 4} composite powders. Phase analysis showed that Ag particles were dispersed on the surface of LiMn{sub 2}O{sub 4} instead of entering the spinel structure. According to the electrochemical tests results, it is clearly to see that Ag additives efficiently improved the cycling stability, reversibility and high-rate discharge capacity of pristine LiMn{sub 2}O{sub 4} by increasing the electrical conductivity between LiMn{sub 2}O{sub 4} particles, decreasing the polarization of cathode and reducing the dissolution of Mn. Meanwhile the influence of the Ag additive contents on the electrochemical properties of the Ag/LiMn{sub 2}O{sub 4} composites is also investigated in detail.

• OSTI ID: 21144089
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 8-9 Vol. 43; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CATHODES
ELECTRIC BATTERIES
ELECTRIC CONDUCTIVITY
ELECTROCHEMISTRY
LITHIUM COMPOUNDS
LITHIUM IONS
MANGANESE OXIDES
PHASE STUDIES
SCANNING ELECTRON MICROSCOPY
SILVER NITRATES
X-RAY DIFFRACTION