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Mesoporous carbon matrix confinement synthesis of ultrasmall WO3 nanocrystals for lithium ion batteries

Abstract

Synthesis of transition metal oxides (TMOs)/carbon nanocomposites are promising for high capacity long life lithium ion batteries (LIBs). Herein, we report a mesoporous carbon matrix confinement growth strategy to synthesize ultrasmall WO3 nanocrystals for lithium storage. In this strategy, WCl6 and phenolic resins (resol) are co-assembled with amphiphilic diblock copolymer PEO-b-PS into ordered mesostructures through an evaporation induced self-assembly (EISA) process. During the pyrolysis process, the resol molecules can be polymerized and carbonized into amorphous mesoporous carbon matrixes, which well lock the amorphous W species. Then, WO3 nanocrystals formed and are uniformly distributed in the ordered mesoporous carbon matrix with the increased pyrolysis temperature, moreover, the particle size is well controlled to ~3 nm under the confinement effect of the carbon matrixes. The resultant ordered mesoporous carbon/WO3 composites show a very large pore size (~11.3 nm), a high surface area (~157 m2 g−1), a high pore volume (~0.25 cm3 g−1), and a WO3 content of 84%. As an anode material for LIBs, the obtained composites show excellent cycling stability and rate performance. A high specific capacity of 440 mAh g−1 can be achieved after 100 cycles at a current density of 0.1 A g−1. We believe that such confinement synthesis strategy is versatile to creating TMOs-based nanocomposites for outstanding LIBs.

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Publication details

The article was received on 24 Jul 2018, accepted on 24 Sep 2018 and first published on 24 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA07145D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Mesoporous carbon matrix confinement synthesis of ultrasmall WO3 nanocrystals for lithium ion batteries

    C. Wang, Y. Zhao, L. Zhou, Y. Liu, W. Zhang, Z. Zhao, H. Wael N., A. Areej Abdulkareem, W. Li and D. Zhao, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07145D

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