Tailoring the linking patterns of polypyrene cathodes for high-performance aqueous Zn dual-ion batteries,Energy & Environmental Science

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Tailoring the linking patterns of polypyrene cathodes for high-performance aqueous Zn dual-ion batteries
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-12-9 , DOI: 10.1039/d0ee03356a
Chong Zhang _{1,

2,

3,

4,

5} , Wenyan Ma _{1,

2,

3,

4,

5} , Changzhi Han _{1,

2,

3,

4,

5} , Lian-Wei Luo _{1,

2,

3,

4,

5} , Aigerim Daniyar _{6,

7,

8,

9} , Sihui Xiang _{1,

2,

3,

4,

5} , Xianyong Wu _{6,

7,

8,

9} , Xiulei Ji _{6,

7,

8,

9} , Jia-Xing Jiang _{1,

2,

3,

4,

5}

Affiliation

Although the utilization of mildly acidic electrolyte can enhance the stability and reversibility of Zn anode, it is still challenging to achieve long cycling life for aqueous Zn batteries at low currents, due to the structural instability of cathode materials during the charge/discharge processes. Herein, we report a series of polypyrenes with different linking patterns and electronic structures as Cl⁻-hosting organic cathodes for aqueous Zn dual-ion batteries (AZDIBs). The comparative study demonstrates that the electronic structures are pivotal to the redox activity of the polypyrenes, which can be tuned by altering the linking patterns on the pyrene unit. Owing to the high surface area, the highly delocalized HOMO distribution, the high HOMO level and the narrow band gap, the polymer CLPy with 1,3,6,8-linking pattern delivers a much higher capacity of 180 mA h g⁻¹ than the two linear counterparts (24 mA h g⁻¹ for LPy-1 and 44 mA h g⁻¹ for LPy-2). Impressively, CLPy exhibits ultra-stable cyclabilities with the capacity retentions of 97.4% after 800 cycles at 50 mA g⁻¹ and 96.4% after 38 000 cycles at 3 A g⁻¹. CLPy also shows a low self-discharge rate with around 90% capacity retention after resting for 28 days. The excellent electrochemical performance demonstrates that CLPy can be a promising cathode material for high-performance AZDIBs.

中文翻译：

量身定制高性能水成锌双离子电池用聚py阴极的连接方式

尽管使用弱酸性电解质可以增强Zn阳极的稳定性和可逆性，但是由于在充电/放电过程中阴极材料的结构不稳定性，要在低电流下实现Zn水溶液的长循环寿命仍然是一项挑战。在此，我们提出了一系列polypyrenes具有不同的连接方式和电子结构为氯^--用于含水锌双离子电池（AZDIB）的有机阴极。对比研究表明，电子结构对于聚py的氧化还原活性至关重要，可以通过改变the单元上的连接方式对其进行调节。由于高的表面面积，高度离域HOMO分布，高HOMO能级和窄的带隙，所述聚合物与CLPy 1,3,6,8-联图案提供高得多的容量180毫安汞柱^-1比两个线性对应物（LPy-1为24 mA hg ^-1，LPy-2为44 mA hg ^-1）。令人印象深刻的是，CLPy具有超稳定的循环能力，在50 mA g ^-1的800个循环后，容量保持率为97.4％，在3 A g ^-1的38 000个循环后，容量保持率为96.4％。CLPy在静置28天后也显示出较低的自放电率，容量保持率约为90％。出色的电化学性能表明，CLPy可以成为高性能AZDIB的有希望的阴极材料。

更新日期：2020-12-22

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