Abstract
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 118.8mAhg−1 even at high rate of 10C and show a capacity decay rate of ~2.3% after 120 cycles.
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