Synthesis and characterization of nano-Li_1.95FeSiO₄/C composite as cathode material for lithium-ion batteries

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• 作者：Xiaobing Huang^a ; ^b ; ^{hxb220170@yahoo.com} ; Honghui Chen^c ; Shibiao Zhou^a ; Yuandao Chen^a ; Jifeng Yang^a ; Yurong Ren^d ; Haiyan Wang^e ; Meizhen Qu^f ; Zhonglai Pan^b ; Zuolong Yu^b ; ^f
• 关键词：Lithium ion battery ; Solid-state reaction ; Li1.95FeSiO4/C composite ; Li2FeSiO4/C composite ; Li vacancies
• 刊名：Electrochimica Acta
• 出版年：2012
• 出版时间：15 January, 2012
• 年：2012
• 卷：60
• 期：Complete
• 页码：239-243
• 全文大小：717 K

文摘

Li_1.95FeSiO₄/C and Li₂FeSiO₄/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_1.95FeSiO₄/C composite could exhibit much better battery performance in terms of the discharge capacity, cycling stability and rate capability in comparison with the Li₂FeSiO₄/C composite. At 0.2C and 5C, it delivered a discharge capacity of 142 mAh g^? and 93 mAh g^?, respectively, and after 100 cycles at 1C, 95.1 % of its initial capacity was retained.