High rate performance intensified by nanosized LiFePO4 combined with three-dimensional graphene networks

Ping Lin Kuo, Chun Han Hsu, Huan Te Chiang, Jung Mu Hsu

研究成果: Article同行評審

12 引文 斯高帕斯(Scopus)

摘要

A sample of nanosized LiFePO4/graphene/carbon (NLFP/GC) hybrid material was achieved by homogenously dispersing a lab-fabricated NLFP (<100 nm) preparation inside well-exfoliated graphene, followed by carbon coating on the NLFP to constitute a three-dimensional network. For comparison, the NLFP coated with sucrose (NLFP/C) and the NLFP solely dispersed in graphene (NLFP/G) were prepared and evaluated. For these as-prepared products, the purity of the LFP component was characterized by X-ray diffraction, while the morphology was characterized by scanning electron microscopy and transmission electron microscopy. The nanosized and homogeneously dispersed NLFP/C in composite insures high capacities, indicating that can significantly shorten the pathway for lithium ion diffusion. Under different charge/discharge rates, the capacities of NLFP/GC are all higher than those of NLFP, NLFP/C, and NLFP/G. Also, NLFP/GC exhibited the excellent rate performance of 101 mAh g-1 compared to NLFP/C (ca. 0 mAh g-1) and NLFP/G (58 mAh g -1) at 10C. It is clear that the three-dimensional graphene network of NLFP/GC, very efficiently promote the conductivity of the poorly conductive LiFePO4. Also, the graphene skeleton can serve as a solid scaffold to restrain the aggregation of NLFP. The outstanding electrochemical performance of NLFP/GC derives from the nanosized NLFP in combination with the graphene/carbon layer.

原文English
文章編號1966
期刊Journal of Nanoparticle Research
15
發行號12
DOIs
出版狀態Published - 2013 十二月

All Science Journal Classification (ASJC) codes

  • 生物工程
  • 化學 (全部)
  • 原子與分子物理與光學
  • 建模與模擬
  • 材料科學(全部)
  • 凝聚態物理學

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