Manikandan, P. and Periasamy, P. and Jagannathan, R. (2013) Sol–gel synthesis and impedance characteristics of networked nanocrystalline olivine cathode for Li-ion full cells. Journal of Materials Chemistry A, 1. pp. 15397-15405. ISSN 0959-9428

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A sol–gel synthesis using adipic acid yielded small particles of around 20 nm in size of olivine LiFePO4/C cathode materials. In the characterization of cathode system(s), solid state impedance spectra of the pristine LiFePO4/C cathode revealed clear localization of charge through charge build-up. When networked with MWCNT, this material facilitates enhancement in charge mobility, eventually explaining the capacity enhancement of the LiFePO4/C–MWCNT electrode, which yields a high capacity of 163 mA h g�1 at C/10. On the other hand, the lower capacity of 125 mA h g�1 found for the pristine LiFePO4/C electrode material can be explained in terms of charge becoming localized/trapped in the vicinity of inter- and intra-granular regions of the cathode particles. To get a broader view of the application potential (in terms of cell voltages of �3 V, 2 V, and safety aspects) of the networked cathode materials, two kinds of Li-ion full cells using mesocarbon microbeads (MCMB) and Li4Ti5O12 as anodes were fabricated, which yielded capacities of 1.94 and 2.1 mA h respectively

Item Type: Article
Uncontrolled Keywords: sol-gel; lithium ion; fuel cells
Subjects: Fuel Cells
Lithium batteries
Electrochemical Power Sources
Depositing User: Dr. N Meyyappan
Date Deposited: 05 Jan 2015 04:51
Last Modified: 05 Jan 2015 04:51

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