Toward High Energy Organic Cathodes for Li-Ion Batteries: A Case Study of Vat Dye/Graphene Composites,Advanced Functional Materials

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Toward High Energy Organic Cathodes for Li-Ion Batteries: A Case Study of Vat Dye/Graphene Composites
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2016-09-20 06:20:58 , DOI: 10.1002/adfm.201603603
Wei Ai _{1,

2} , Weiwei Zhou ₃ , Zhuzhu Du ₁ , Chencheng Sun ₁ , Jun Yang ₁ , Yu Chen ₂ , Zhipeng Sun ₄ , Shun Feng ₂ , Jianfeng Zhao ₁ , Xiaochen Dong ₁ , Wei Huang _{1,

5} , Ting Yu _{2,

6}

Affiliation

Despite the fascinating Li storage properties of organic carbonyl compounds, e.g., high therotical capacity and fast kinetics, it is still lack of a facile and effective way that capable of large-scale producion of advanced carbonyl cathodes for Li-ion batteries (LIBs). Here, a generic strategy is proposed by combining sonication and hydrothermal techniques for scalable synthesis of high performance organic carbonyl cathodes for LIBs. A series of commercialized vat dyes with abundant electroactive conjugated carbonyl groups are confined in between the graphene layers, forming a compatible 3D hybrid architecture. The unique structure affords good Li⁺ ions accessibility to the electrode and short Li⁺ ions diffusion length. Meanwhile, each sandwiched graphene layer functions as a miniature current collector, ensuring fast electron transport throughout the entire electrode. Consequently, the cathodic performances of LIBs using the composites as electrodes, for example, Vat Green 8/graphene, Vat Brown BR/graphene, and Vat Olive T/graphene, possess high specific capacity, exceptional cycling stability, and excellent rate capability. The effect of vat dye content on the morphology, structure, and the final electrochemical performance of the composites is investigated as well. This work provides a versatile and low-cost platform for large-scale development of advanced organic-based electrodes toward sustainable energy fields.

中文翻译：

面向锂离子电池的高能有机阴极：还原染料/石墨烯复合材料的案例研究

尽管有机羰基化合物具有引人入胜的Li储存特性，例如高的热容量和快速的动力学特性，但仍然缺少能够大规模生产用于锂离子电池（LIB）的先进羰基阴极的简便有效的方法。在此，通过结合超声处理和水热技术提出了一种通用策略，用于可扩展合成LIB的高性能有机羰基阴极。一系列具有丰富的电活性共轭羰基的商品化还原染料被限制在石墨烯层之间，形成了兼容的3D杂化结构。独特的结构得到良好的锂⁺离子可接近电极和短栗⁺离子扩散长度。同时，每个夹在中间的石墨烯层都起着微型集电器的作用，从而确保了电子在整个电极中的快速传输。因此，使用复合材料作为电极的LIB的阴极性能，例如Vat Green 8 /石墨烯，Vat Brown BR /石墨烯和Vat Olive T /石墨烯，具有高的比容量，出色的循环稳定性和出色的倍率性能。还研究了还原染料含量对复合材料的形态，结构和最终电化学性能的影响。这项工作为高级有机基电极向可持续能源领域的大规模开发提供了一种通用且低成本的平台。

更新日期：2017-05-17

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