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Issue 22, 2018
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Rational design of a synthetic strategy, carburizing approach and pore-forming pattern to unlock the cycle reversibility and rate capability of micro-agglomerated LiMn0.8Fe0.2PO4 cathode materials

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Abstract

Nanometer-sized LiMn0.8Fe0.2PO4 (nano-LMFP) is one of the most suitable LiMnPO4 derived cathode materials to maximize gravimetric capacity and rate capability. However, the poor cycling performance, low volumetric energy density and safety hazards of nano-LMFP limit its large-scale commercialization. To overcome these development bottlenecks, a uniform three-dimensional interconnected conductive carbon network modified LiMn0.8Fe0.2PO4 nanoporous micro-agglomerated (micro-LMFP/C) composite was synthesized via a three-step solid-state reaction (3S) combined with three-step carburizing (3C) and two-step pore-forming (2P). The novel micro-LMFP/C composite exhibits excellent gravimetric/volumetric reversible capacities, weak electrochemical polarization and high rate capability. Even if increased to 20C, a satisfactory discharge capacity of 92.5 mA h gāˆ’1 (70.2% of the initial value at 0.1C) and an outstanding discharge plateau of 3.76 V can be observed. More importantly, for the 3S synthetic strategies, the novel 3C2P-assisted synthesis of micro-LMFP/C composites can simultaneously deliver 2.6 and 1.5 times higher volumetric capacity than that of synchronous and stepwise carburizing assisted synthesis of samples, respectively.

Graphical abstract: Rational design of a synthetic strategy, carburizing approach and pore-forming pattern to unlock the cycle reversibility and rate capability of micro-agglomerated LiMn0.8Fe0.2PO4 cathode materials

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Publication details

The article was received on 14 Apr 2018, accepted on 03 May 2018 and first published on 05 May 2018


Article type: Paper
DOI: 10.1039/C8TA03418D
Citation: J. Mater. Chem. A, 2018,6, 10395-10403
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    Rational design of a synthetic strategy, carburizing approach and pore-forming pattern to unlock the cycle reversibility and rate capability of micro-agglomerated LiMn0.8Fe0.2PO4 cathode materials

    Y. Wang, C. Wu, H. Yang and J. Duh, J. Mater. Chem. A, 2018, 6, 10395
    DOI: 10.1039/C8TA03418D

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