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Issue 15, 2019
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Constructing hyperbranched polymers as a stable elastic framework for copper sulfide nanoplates for enhancing sodium-storage performance

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Abstract

Electrochemical conversion reactions offer a new avenue to build high-capacity anodes for sodium-ion batteries. However, poor long-term cyclability and low coulombic efficiency at the first cycle remain a significant challenge for practical Na-ion battery applications. Herein, a novel hyperbranched polymer is used as a template and electrode additive to construct unique hierarchical Cu9S5 nanoplates. With an internal uniform distribution, the additive could regulate the morphology and microstructure of Cu9S5 and offer a buffering matrix to alleviate nanoparticle aggregation and enhance solid-state Na+ ion diffusion. This Cu9S5 composite anode exhibits a high reversible capacity of 429 mA h g−1 at 100 mA g−1, a high coulombic efficiency of 94.3% at the first cycle, a superior rate capability of 300 mA h g−1 at 20 A g−1, and an outstanding cyclability with 82.2% capacity retention after 1000 cycles. The kinetic study reveals that Cu9S5–AHP nanoplates show a low charge transfer resistance and high Na+ diffusion coefficient (∼10−9 cm2 s−1). The present work suggests a potentially feasible anode material for sodium-ion batteries and, more significantly, demonstrates a novel strategy for the construction of high-performance conversion materials for sodium-ion batteries.

Graphical abstract: Constructing hyperbranched polymers as a stable elastic framework for copper sulfide nanoplates for enhancing sodium-storage performance

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Publication details

The article was received on 12 Jan 2019, accepted on 17 Mar 2019 and first published on 18 Mar 2019


Article type: Paper
DOI: 10.1039/C9NR00371A
Nanoscale, 2019,11, 7188-7198

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    Constructing hyperbranched polymers as a stable elastic framework for copper sulfide nanoplates for enhancing sodium-storage performance

    A. Qin, H. Wu, J. Chen, T. Li, S. Chen, D. Zhang and F. Xu, Nanoscale, 2019, 11, 7188
    DOI: 10.1039/C9NR00371A

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