使用核-壳交联的聚合物@ C-碘空心球协同抑制聚碘梭，并提高基于碘的电池的动力学性能<a href="#fn1" title="可用的电子补充信息（ESI）：实验细节，计算策略，XRD图，拉曼光谱和PVP-1样品的形态，碳基阳极的电化学性能。参见DOI：10.1039 / c8ta01470a">†</a>,Journal of Materials Chemistry A

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使用核-壳交联的聚合物@ C-碘空心球协同抑制聚碘梭，并提高基于碘的电池的动力学性能 †
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-04-14 00:00:00 , DOI: 10.1039/c8ta01470a
Guoming Zhang _{1,

2,

3,

4,

5} , Huifeng Wang _{2,

6,

7,

8,

9} , Sen Zhang _{2,

6,

7,

8,

9} , Chao Deng _{1,

2,

3,

4,

5}

Affiliation

可充电的基于碘的电池由于其高能量密度和低成本而备受关注，但是动力学差和高碘溶解度严重地限制了其实际应用。在本研究中，中空核-壳交联的聚合物@ C-碘球被开发出来，以促进碘电极的综合特性。本研究使用了一种简便的“自上而下”的合成方法。“顶部”前体是基于n掺杂空心碳球（NHCS）-碘基质制备的，该基质已连接并填充了聚乙烯吡咯烷酮（PVP）-碘聚合物溶液。溶剂蒸发后，聚合物收缩，制造出壳-核交联单元，产生“降级”产物，即聚合物@ C-碘球。它不仅具有高导电性和多孔性的底物以加速电化学动力学，而且在PVP和碘之间具有强大的化学相互作用以限制多碘化合物的穿梭。在此，首次解释了聚合物@ C-碘球的氧化还原机理，此外，还展示了它们在加速电化学动力学和促进热稳定性方面的协同作用。改进的动力学和热特性有利于其优异的倍率性能，长期循环稳定性和低聚碘化物梭，这使其成为碘基电池的理想正极材料。而且，锂-碘系统这四种基于碘的电池具有优异的高倍率长期循环性能。基于聚合物@ C-碘球的钠-碘系统和碘-碳（锂离子和钠离子）充满电池进一步证明了它们的广泛适用性和高效率。这项工作不仅为制造高性能电极提供了新的策略，而且为开发低成本，高安全性和高性能的基于碘的电化学系统提供了一些新见识。

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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†

Rechargeable iodine-based batteries have attracted much attention owing to their high energy density and low cost, but the inferior kinetics and high iodine solubility severely restrict their practical applications. In the present study, hollow core–shell interlinked polymer@C–iodine spheres were developed to promote the comprehensive characteristics of the iodine electrode. A facile “top-down” synthesis process is used in the present study. The “top” precursor was prepared based on an n-doped hollow carbon sphere (NHCS)–iodine substrate, which was connected and filled with polyvinylpyrrolidone (PVP)–iodine polymer solution. After the solvent was evaporated, the polymer contracted and the shell–core interlinked units were 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 polyiodide shuttle. Herein, for the first time, the redox mechanism of the polymer@C–iodine spheres is explained, and moreover, their synergistic effects on accelerating electrochemical kinetics and promoting thermal stability are demonstrated. The improved kinetic and thermal characteristics are favorable to their superior rate capability, long-term cycling stability and low polyiodide shuttle, which make them a good cathode candidate for iodine-based batteries. Moreover, the superior high-rate long-term cycling properties of four kinds of iodine-based batteries, namely lithium–iodine systems, sodium–iodine systems and iodine–carbon (lithium-ion and sodium-ion) full batteries, which are based on the polymer@C–iodine spheres further demonstrate their wide applicability and high efficiency. This work not only provides a new strategy to fabricate high-performance electrodes, but also provides some new insights into developing iodine-based electrochemical systems with low cost, high safety and high performance.

更新日期：2018-04-14

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