Synthesis, structure and electrochemistry of Ag-modified LiMn{sub 2}O{sub 4} cathode materials for lithium-ion batteries
- 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, Vol. 43, Issue 8-9; Other Information: DOI: 10.1016/j.materresbull.2007.08.013; PII: S0025-5408(07)00376-5; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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