Improved electrochemical properties of LiFePO₄/graphene/carbon composite synthesized from FePO₄·2H₂O/graphene oxide

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• 作者：Kaipeng Wu ; Guorong Hu ; ^{hgrhsj@263.net" class="auth_mail" title="E-mail the corresponding author} ; Ke Du ; ^{dukeben1976@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Zhongdong Peng ; Yanbing Cao
• 关键词：B. Composite ; Lithium ion battery ; LiFePO4 ; Graphene
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：13867-13871
• 全文大小：1998 K

文摘

LiFePO₄/graphene/carbon composite (LFP/G/C) was synthesized by in-situ precipitation of FePO₄·2H₂O/graphene oxide composite (GO–FePO₄·2H₂O) and solid state reaction to form LFP/C using Li₂CO₃ as the lithium resource as well as reduce GO to graphene. SEM results show that a great amount of FePO₄·2H₂O particles are grown on the GO sheets in GO–FePO₄·2H₂O. From the TEM and HRTEM results, an effective electronic conducting network on LiFePO₄ particles is formed by both graphene and conductive carbon in the LFP/G/C, which can deliver a discharge capacity of 118.8 mA h g⁻¹ even at high rate of 10 C and show a capacity decay rate of ~2.3% after 120 cycles.