Effect of graphene nanosheets content on the morphology and electrochemical performance of LiFePO4 particles in lithium ion batteries
作者： Houbin Liu , Cui Miao , Yan Meng , Qiang Xu , Xinhe Zhang
DOI: 10.1016/J.ELECTACTA.2014.05.028
关键词:
摘要: Abstract Few layers graphene nanosheets (GS) are obtained by the reduction of graphite oxide (GO) via Lithium aluminium tetrahydride (LiAlH4) and Phosphorus tribromide (PBr3) as deoxidizer. The LiFePO4/GS composite is prepared using a solution phase method followed calcination process with only 2 h at 600 °C. effect GS content in on morphology electrochemical performance LiFePO4 particles extensively investigated. Results show that optimized amount 5%. primary particle size LiFePO4/5%GS 100∼150 nm which wrapped connected homogeneously loosely ∼4 layers. can restrict growth construct an effective conductive network composite, all enhance conductivity particle. delivers capacity 155.4 mAhg−1 0.2 C, much higher than pure (125.3 mAhg−1). Even high rate 5 C, specific 124.3 mAhg−1 achievable, no obvious fading after 100 cycles.
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