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Issue 7, 2014
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Effective wrapping of graphene on individual Li4Ti5O12 grains for high-rate Li-ion batteries

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Abstract

An effective way of synthesizing graphene-wrapped Li4Ti5O12 particles was developed by solid-state reaction between graphene oxide-wrapped P25 (TiO2) and Li2CO3. Compared to the previously reported graphene/Li4Ti5O12 composites, prior wrapping of TiO2 with subsequent chemical lithiation led to more effectively confined Li4Ti5O12. The Li4Ti5O12 tightly bound by graphene exhibited a remarkable specific capacity of 147 mA h g−1 at a rate of 10 C (1 C = 175 mA g−1) after 100 cycles. This rate capability is one of the highest values among reported Li4Ti5O12 with 150 ± 50 nm grains. The improved rate capability was attributed to the enhanced electronic conductivity of each Li4Ti5O12 grain via uniform graphene wrapping, with single-grain growth during annealing from the initial ∼25 nm TiO2 nanoparticles enclosed by outer graphene sheets. Graphene-eliminated Li4Ti5O12 by thermal decomposition was also directly compared to the graphene-coated sample, to clarify the role of graphene with nearly equivalent particle size/morphology distributions.

Graphical abstract: Effective wrapping of graphene on individual Li4Ti5O12 grains for high-rate Li-ion batteries

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Publication details

The article was received on 25 Oct 2013, accepted on 04 Nov 2013 and first published on 04 Nov 2013


Article type: Communication
DOI: 10.1039/C3TA14347C
Citation: J. Mater. Chem. A, 2014,2, 2023-2027
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    Effective wrapping of graphene on individual Li4Ti5O12 grains for high-rate Li-ion batteries

    Y. Oh, S. Nam, S. Wi, J. Kang, T. Hwang, S. Lee, H. H. Park, J. Cabana, C. Kim and B. Park, J. Mater. Chem. A, 2014, 2, 2023
    DOI: 10.1039/C3TA14347C

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