用于高倍率和长循环水系锌有机电池的硫杂环醌阴极,Advanced Materials

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用于高倍率和长循环水系锌有机电池的硫杂环醌阴极
Advanced Materials ( IF 27.4 ) Pub Date : 2023-04-10 , DOI: 10.1002/adma.202301088
Qi-Qi Sun _{1,

2} , Tao Sun ₃ , Jia-Yi Du _{2,

4} , Kai Li ₂ , Hai-Ming Xie ₁ , Gang Huang _{2,

4} , Xin-Bo Zhang _{2,

4}

Affiliation

有机材料以其可持续性和结构可设计性在水系锌离子电池（AZIBs）中备受关注，但溶解度高、导电性差、活性基团利用率低等问题阻碍了其进一步发展，导致循环稳定性差，糟糕的速率能力和低容量。为了解决这三大障碍，新型有机主体benzo[b]naphtho[2',3':5,6][1,4]dithiino[2,3-i]thianthrene-5,7,9 ,14,16,18-己酮（BNDTH）具有丰富的电活性基团和稳定的扩展π共轭结构，通过溶剂交换合成法与还原氧化石墨烯（RGO）复合，作为AZIBs的正极材料。精心设计的 BNDTH/RGO 复合材料具有 296 mAh g 的高容量^-1（几乎完全利用活性基团）、120 mAh g ^{-1的优异倍率能力和 58 000 次循环的长寿命，在 10 A g}^-1时容量保持率为 65% 。如此优异的性能可归功于活性分子巧妙的结构设计，以及独特的溶剂交换组成策略，能够在放电/充电过程中有效分散活性分子上的过量电荷。这项工作为有机正极材料的合理设计提供了重要的见解，并对在 AZIBs 中实现理想的高性能具有重要的指导意义。

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A Sulfur Heterocyclic Quinone Cathode Towards High-Rate and Long-Cycle Aqueous Zn-Organic Batteries

Organic materials have attracted much attention in aqueous zinc-ion batteries (AZIBs) due to their sustainability and structure-designable, but their further development is hindered by the high solubility, poor conductivity, and low utilization of active groups, resulting in poor cycling stability, terrible rate capability, and low capacity. In order to solve these three major obstacles, a novel organic host, benzo[b]naphtho[2’,3’:5,6][1,4]dithiino[2,3-i]thianthrene-5,7,9,14,16,18-hexone (BNDTH), with abundant electroactive groups and stable extended π-conjugated structure is synthesized and composited with reduced graphene oxide (RGO) through a solvent exchange composition method to act as the cathode material for AZIBs. The well-designed BNDTH/RGO composite exhibits a high capacity of 296 mAh g⁻¹ (nearly a full utilization of the active groups), superior rate capability of 120 mAh g⁻¹, and a long lifetime of 58 000 cycles with a capacity retention of 65% at 10 A g⁻¹. Such excellent performance can be attributed to the ingenious structural design of the active molecule, as well as the unique solvent exchange composition strategy that enables effective dispersion of excess charge on the active molecule during discharge/charge process. This work provides important insights for the rational design of organic cathode materials and has significant guidance for realizing ideal high performance in AZIBs.

更新日期：2023-04-10

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