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Graphene-modified LiFePO4 cathode for lithium ion battery beyond theoretical capacity

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  • By Lung-Hao Hu

    (Institute of Atomic and Molecular Sciences, Academia Sinica)

  • Feng-Yu Wu

    (Institute of Atomic and Molecular Sciences, Academia Sinica)

  • Cheng-Te Lin

    (Institute of Atomic and Molecular Sciences, Academia Sinica)

  • Andrei N. Khlobystov

    (School of Chemistry, University of Nottingham)

  • Lain-Jong Li

    (Institute of Atomic and Molecular Sciences, Academia Sinica)

Abstract

The specific capacity of commercially available cathode carbon-coated lithium iron phosphate is typically 120–160 mAh g−1, which is lower than the theoretical value 170 mAh g−1. Here we report that the carbon-coated lithium iron phosphate, surface-modified with 2 wt% of the electrochemically exfoliated graphene layers, is able to reach 208 mAh g−1 in specific capacity. The excess capacity is attributed to the reversible reduction–oxidation reaction between the lithium ions of the electrolyte and the exfoliated graphene flakes, where the graphene flakes exhibit a capacity higher than 2,000 mAh g−1. The highly conductive graphene flakes wrapping around carbon-coated lithium iron phosphate also assist the electron migration during the charge/discharge processes, diminishing the irreversible capacity at the first cycle and leading to ~100% coulombic efficiency without fading at various C-rates. Such a simple and scalable approach may also be applied to other cathode systems, boosting up the capacity for various Li batteries.

Suggested Citation

  • By Lung-Hao Hu & Feng-Yu Wu & Cheng-Te Lin & Andrei N. Khlobystov & Lain-Jong Li, 2013. "Graphene-modified LiFePO4 cathode for lithium ion battery beyond theoretical capacity," Nature Communications, Nature, vol. 4(1), pages 1-7, June.
  • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2705
    DOI: 10.1038/ncomms2705
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    Cited by:

    1. Li, Junyi & Jiang, Jinxia & Zhou, Yiguang & Chen, Mo & Xiao, Shuhao & Niu, Xiaobin & Wu, Rui & Yu, Le & Blackwood, Daniel John & Chen, Jun Song, 2023. "Nickel single-atom catalysts on porous carbon nanosheets for high-performance lithium-selenium batteries," Energy, Elsevier, vol. 285(C).
    2. Maria Mechili & Christos Vaitsis & Nikolaos Argirusis & Pavlos K. Pandis & Georgia Sourkouni & Antonis A. Zorpas & Christos Argirusis, 2022. "Research Progress in Metal-Organic Framework Based Nanomaterials Applied in Battery Cathodes," Energies, MDPI, vol. 15(15), pages 1-30, July.
    3. Seok Hee Lee & Sung Pil Woo & Nitul Kakati & Dong-Joo Kim & Young Soo Yoon, 2018. "A Comprehensive Review of Nanomaterials Developed Using Electrophoresis Process for High-Efficiency Energy Conversion and Storage Systems," Energies, MDPI, vol. 11(11), pages 1-81, November.
    4. Guanjun Ji & Junxiong Wang & Zheng Liang & Kai Jia & Jun Ma & Zhaofeng Zhuang & Guangmin Zhou & Hui-Ming Cheng, 2023. "Direct regeneration of degraded lithium-ion battery cathodes with a multifunctional organic lithium salt," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    5. Diwakar Karuppiah & Rajkumar Palanisamy & Arjunan Ponnaiah & Wei-Ren Liu & Chia-Hung Huang & Subadevi Rengapillai & Sivakumar Marimuthu, 2020. "Eggshell-Membrane-Derived Carbon Coated on Li 2 FeSiO 4 Cathode Material for Li-Ion Batteries," Energies, MDPI, vol. 13(4), pages 1-13, February.
    6. Geonhui Gwak & Hyunchul Ju, 2019. "Multi-Scale and Multi-Dimensional Thermal Modeling of Lithium-Ion Batteries," Energies, MDPI, vol. 12(3), pages 1-27, January.

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