Facile synthesis and enhanced electrochemical performance of Li₂FeSiO₄/C/reduced graphene oxide nanocomposites

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• 作者：Xiaomei Wang^a ; Caixia Qing^a ; Qingtang Zhang^a ; ^b ; ^{zhqt137@163.com" class="auth_mail} ; Weifeng Fan^b ; Xiaobing Huang^c ; Baoping Yang^a ; Jinfeng Cui^a
• 关键词：Li2FeSiO4 ; Reduced graphene oxide ; nanocomposites ; Lithium-ion battery
• 刊名：Electrochimica Acta
• 出版年：10 July 2014
• 年：2014
• 卷：134
• 期：Complete
• 页码：371-376
• 全文大小：3043 K

文摘

Li₂FeSiO₄/amorphous carbon/reduced graphene oxide (LFS/C/rGO) was synthesized from nano-SiO₂, rGO, Li₂CO₃, FeC₂O₄·2H₂O and ammonium citrate by a facile solid-state reaction method. Electrical conductivity tests and charge-discharge voltage profiles indicate LFS/C/rGO with 20 wt.% rGO shows the highest electrical conductivity and highest discharge capacity of 191.6 mAh g⁻¹. XRD results reveal rGO can promote the Li₂FeSiO₄ crystalline grain growing, especially the (210) crystal face growing. SEM results indicate a more valid conductive network is formed in LFS/C/rGO. TEM image shows the good crystalline of LFS in LFS/C/rGO composite. FT-IR spectrum indicates that 1638 cm⁻¹ peak of rGO's C = C bonds are observed in LFS/C/rGO and all typical characteristic absorption peaks of LFS/C/rGO exhibit blue shifts compared to that of LFS/C. The electrochemical measurements illustrate that LFS/C/rGO has much better electrochemical performance than that of LFS/C. The main reason might be attributed to the more valid conductive network formed by amorphous carbon and rGO.