Ultrathin LiFePO4 nanosheets self-assembled with reduced graphene oxide applied in high rate lithium ion batteries for energy storage

WeiWei Yang, JianGuo Liu, Xiang Zhang, Liang Chen, Yong Zhou and ZhiGang Zou

Applied Energy, 2017, vol. 195, issue C, 1079-1085

Abstract: Liquid-phase ultrasonic exfoliation approach was applied to acquire ultrathin lithium iron (II) phosphate (LiFePO4) nanosheets (LFP-NS) with the thickness of only ∼15nm. The LFP-NS were then self-assembly with graphene oxide (GO) with amido bonds. Ultrashort diffusion pathways to lithium ions (Li+) could be achieved with high percentage of (010) facets exposed to LFP-NS, which reduced the diffusion distance for Li+ along the [010] direction effectively. In addition, the reduced graphene oxide (rGO) firmly adhered to the surface of LFP-NS by self-assemble method after sintering, which formed an excellent conductive network and facilitate electron transportation. The ultrathin diffusion channels into Li+ and tight conductive network resulting in an excellent high rate discharging performance, e.g. up to 102mAhg−1 at 30C, while discharge capacity retention can reach to 93.4% at 20C after 500 cycles. This kind of composite was an ideal cathode material used in high rate lithium ion batteries.

Keywords: LiFePO4; Ultrathin nanosheets; Reduced graphene oxide; Self-assembled; Lithium ion batteries (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1016/j.apenergy.2016.06.047

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