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Using Core-Shell Interlinked Polymer@C-Iodine Hollow Spheres to Synergistically Depress Polyiodide-Shuttle and Boost Kinetics for Iodine Based Batteries

Abstract

Rechargeable iodine based batteries have attracted widespread attention owing to their high energy density and low cost, but the inferior kinetics and high iodine solubility severely restrict their practical applications. In present study, the hollow core-shell interlinked polymer@C-iodine spheres are developed to promote the comprehensive characteristics of the iodine electrode. A facile “top-down” synthesis is used in present study. The “top” precursor is prepared based on the N-doped hollow carbon sphere (NHCS)-iodine substrate, which are connected and filled with polyvinylpyrrolidone (PVP)-iodine polymer solution. After evaporating the solvent, the polymer shrinks and the shell-core interlinked units are fabricated, resulting in the “down” product, i.e. polymer@C-iodine spheres. It not only has a highly conductive and porous substrate to accelerate electrochemical kinetics, but also possesses strong chemical interactions between PVP and iodine to restrict the polyiodidine shuttle. For the first time, the redox mechanism of the polymer@C-iodine spheres is clarified, and moreover, its synergistic effects on accelerating electrochemical kinetics and promoting thermal stability are demonstrated. The improved kinetic and thermic characteristics are favorable to its superior rate capability, long-term cycling stability and low polyiodide shuttle, which make it a good cathode candidate for iodine based batteries. Moreover, the superior high-rate long-term cycling properties of four kinds of iodine based batteries, i. e. the lithium-iodine, sodium-iodine systems and iodine-carbon (lithium-ion and sodium-ion) full batteries, that are based on the polymer@C-iodine spheres further demonstrate its wide applicability and high efficiency. This work not only provides a new strategy to fabricate high-performance electrode, but also get some new insights into developing iodine based electrochemical systems with low-coat, high safety and superior performance.

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Publication details

The article was received on 11 Feb 2018, accepted on 12 Apr 2018 and first published on 14 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01470A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Using Core-Shell Interlinked Polymer@C-Iodine Hollow Spheres to Synergistically Depress Polyiodide-Shuttle and Boost Kinetics for Iodine Based Batteries

    G. zhang, H. wang, S. Zhang and C. Deng, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01470A

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