Zhongke Laifang Energy and Technology Co.

and Technology, China

Zhongke Laifang Energy and Technology Co.

and Technology, China

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Huang X.,CAS Chengdu Institute of Organic Chemistry | Huang X.,University of Chinese Academy of Sciences | Huang X.,Zhongke Laifang Energy and Technology Co. | Li X.,CAS Institute of Electronics | And 5 more authors.
Electrochimica Acta | Year: 2010

Li2FeSiO4/carbon/carbon nano-tubes (Li 2FeSiO4/C/CNTs) and Li2FeSiO4/carbon (Li2FeSiO4/C) composites were synthesized by a traditional solid-state reaction method and characterized comparatively by X-ray diffraction, scanning electron microscopy, BET surface area measurement, galvanostatic charge-discharge and AC impedance spectroscopy, respectively. The results revealed that the Li2FeSiO4/C/CNT composite exhibited much better rate performance in comparison with the Li 2FeSiO4/C composite. At 0.2 C, 5 C and 10 C, the former composite electrode delivered a discharge capacity of 142 mAh g-1, 95 mAh g-1, 80 mAh g-1, respectively, and after 100 cycles at 1 C, the discharge capacity remained 95.1% of its initial value. © 2010 Elsevier Ltd. All rights Reserved.


Huang X.,University of Science and Arts of Iran | Huang X.,Zhongke Laifang Energy and Technology Co. | Huang X.,Changde Lyrun New Material Co. | Chen H.,Changde Lyrun New Material Co. | And 11 more authors.
Solid State Ionics | Year: 2012

Li 1.95FeSiO 4/C/CNTs, Li 2FeSiO 4/C/CNTs and Li 1.95FeSiO 4/C composites were successfully prepared by the means of solid-state reaction in the present work. X-ray diffraction (XRD), scanning electron microscopy (SEM), charge-discharge test and electrochemical impedance spectra measurement were used to characterize the above samples and their differences were comparatively discussed. It was found that the Li 1.95FeSiO 4/C/CNTs composite delivered the best electrochemical performance in terms of the discharge capacity, cycling stability and rate capability among the above three samples. It exhibited a discharge capacity of 148 mAh g - 1 at 0.2 C and 104 mAh g - 1 at 5 C, respectively, and after 100 cycles at 1 C, 99.2% of its initial capacity was retained. EIS result showed that electrochemical resistance of the Li 1.95FeSiO 4/C/CNTs electrode was obviously decreased, revealing much faster kinetics in comparison with the Li 2FeSiO 4/C/CNTs and Li 1.95FeSiO 4/C electrodes. © 2012 Elsevier B.V.


Huang X.,CAS Chengdu Institute of Organic Chemistry | Huang X.,University of Chinese Academy of Sciences | Huang X.,Zhongke Laifang Energy and Technology Co. | Li X.,CAS Institute of Electronics | And 5 more authors.
Solid State Ionics | Year: 2010

Li2FeSiO4/C cathode material was synthesized by a traditional solid-state reaction method with Li2CO3, FeC2O4•2H2O, nano SiO2 as starting materials and pitch as the carbon source. For comparison, the Li 2FeSiO4/C with glucose as the carbon source and the pristine Li2FeSiO4 were also prepared. The as-prepared materials were characterized by X-ray diffraction, scanning electron microscopy, elementary analyzer, BET specific surface area, galvanostatic charge-discharge test and AC impedance spectroscopy. The results demonstrated that the Li 2FeSiO4/C composites showed better electrochemical properties compared with the pristine Li2FeSiO4. Surprisingly, the Li2FeSiO4/C with pitch as carbon source exhibited the best electrochemical properties among the three samples, it delivered a specific discharge capacity of 139 mAh g-1, 127 mAh g-1, 118 mAh g-1 and 103 mAh g-1 at 0.2 C, 0.5 C, 1 C and 2 C, respectively. After 100 cycles at the rate of 1 C, the discharge capacity remained 93.6% of its initial value. © 2010 Published by Elsevier B.V.


Huang X.,University of Science and Arts of Iran | Huang X.,Zhongke Laifang Energy and Technology Co. | Chen H.,Changde Lyrun New Material Co. | Zhou S.,University of Science and Arts of Iran | And 8 more authors.
Electrochimica Acta | Year: 2012

Li 1.95FeSiO 4/C and Li 2FeSiO 4/C composites were synthesized by a traditional solid-state reaction method and then discussed comparatively through the results of X-ray diffraction (XRD), scanning electron microscopy (SEM), the Brunauer-Emmet-Teller (BET) method, the charge-discharge test and electrochemical impedance spectra measurement, respectively. The results demonstrated that the Li 1.95FeSiO 4/C composite could exhibit much better battery performance in terms of the discharge capacity, cycling stability and rate capability in comparison with the Li 2FeSiO 4/C composite. At 0.2C and 5C, it delivered a discharge capacity of 142 mAh g -1 and 93 mAh g -1, respectively, and after 100 cycles at 1C, 95.1% of its initial capacity was retained. © 2011 Elsevier Ltd. All rights reserved.

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