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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.125  No.4 (April) (2017)  >  pp.281-286

Journal of the Ceramic Society of Japan
<<Previous article Vol.125  No.4 (April) (2017)   pp.281 - 286 Next article>>

Improvement of electrochemical property of pyroxene-type LiFeSi2O6 and crystal-structure analysis

Naoya ISHIDA1), Kazumasa SAKATSUME1), Naoto KITAMURA1), Yasushi IDEMOTO1)
1) Faculty of Science & Technology, Tokyo University of Science

Lithium iron metasilicate, LiFeSi2O6, was synthesized via a hydrothermal route and was identified as the pyroxene structure with space group C2/c using the synchrotron X-ray diffraction. Galvanostatic charge and discharge tests showed that the large charge and discharge capacities were obtained for the carbon-LiFeSi2O6 composite prepared by planetary ball-milling. The 10 wt % carbon-LiFeSi2O6 composite delivered a specific discharge capacity of 174 mAh·g−1 at 25°C in the voltage range from 1.5 to 4.8 V because of the enhancement of the electric conductivity. The valence state of iron was estimated by the X-ray Absorption Near Edge Structure spectra, where the oxidation states changed from charge to discharge state. The Galvanostatic Intermittent Titration measurement was applied for LiFeSi2O6 and carbon-LiFeSi2O6 composite, and then the improved Li+ diffusion was derived from the fully electron supply by the enhanced electric conductivity.


Keyword:
Li-ion battery, Cathode, Crystal structure analysis, Pyroxene

Received: October 31, 2016
Accepted: December 22, 2016 , Published online: April 03, 2017

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