Dual Layer Coating Strategy Utilizing N-doped Carbon and Reduced Graphene Oxide for High-Performance LiFePO4 Cathode Material

Jiseop Oh, Jeongyeon Lee, Taejin Hwang, Jong Min Kim, Kwang dong Seoung, Yuanzhe Piao

    Research output: Journal article publicationJournal articleAcademic researchpeer-review

    30 Citations (Scopus)

    Abstract

    Lithium iron phosphate (LiFePO4, LFP) has two major drawbacks such as low lithium ion diffusivity and poor electric conductivity, which limit the wider application as a cathode material for lithium ion batteries. In this work, we report a dual carbon layer coating strategy for LFP, which uses polydopamine-derived nitrogen-doped carbon (N-doped carbon) and reduced graphene oxide (RGO). These dual carbon layers are prepared by a one-pot polymerization process and thermal treatment. The dual carbon coated LFP has a rate capability with a discharge capacity of 98 mAh/g at 30C, cycling performance with a discharge capacity of 115 mAh/g at 10C, and 96.18% capacity retention after 700 cycles. The high rate performance and the excellent long-term cycling stability can be attributed to the enhanced electric conductivity with N-doped carbon coating, the well-connected electron pathway, and the fast Li+ ion diffusion induced by the small size of the particles. Consequently, coating of LFP with polydopamine derived N-doped carbon and RGO produces a material suitable for high-performance lithium-ion batteries.

    Original languageEnglish
    Pages (from-to)85-93
    Number of pages9
    JournalElectrochimica Acta
    Volume231
    DOIs
    Publication statusPublished - 20 Mar 2017

    Keywords

    • LiFePOnanoplates
    • nitrogen-doped carbon
    • polydopamine
    • rate performance
    • reduced graphene oxide

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Electrochemistry

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