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Amorphous red phosphorus nanosheets anchored on graphene layers as high performance anodes for lithium ion batteries



Amorphous red phosphorus nanosheets anchored on graphene layers as high performance anodes for lithium ion batteries



Nanoscale 9(46): 18552-18560



A facile solution-based method was developed to combine the advantage of amorphous nanoscale red P sheets and highly conductive graphene, forming a high-performance P/graphene composite anode for advanced lithium ion batteries. Graphene can be easily expanded into a 3D framework in solution with rich interior porosity and abundant adsorption points, which enables a large percentage of red P to be loaded and form a uniform P/graphene hybrid structure. The nanoscale and amorphous features of red P effectively reduce the volume expansion and mechanical stress within individual P sheets, thereby alleviating P pulverization during cycling. The well dispersed graphene serves as a buffer layer to accommodate the volume expansion and adsorb the stress during electrochemical reactions, thereby maintaining a robust electrode structure. Besides, the highly conductive graphene greatly enhances the ionic/electronic conductivity of the electrode, which favors efficient redox reactions and high P utilization. Based on the superior composite structure, the potentials of both components can be fully exerted, resulting in excellent electrochemical performance. The P/graphene electrode delivered a high reversible capacity of 1286 mA h g-1 based on the weight of the composite after 100 cycles at 200 mA g-1. Even at a high current density of 1000 mA g-1, the composite electrode exhibits a high capacity of 1125 mA h g-1, revealing its potential as a high-performance P-carbon composite anode for advanced lithium ion batteries.

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Accession: 059349562

Download citation: RISBibTeXText

PMID: 29164225

DOI: 10.1039/c7nr06476d


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