Abstract Organic cathode materials are drawing increasing attention in lithium-ion battery for their abundance, environmental friendliness, high specific capacity, low cost, and flexibility. But their application has been hindered by poor electrochemical performance because of inherent low conductivity and high solubility in the polar organic electrolyte. Herein, an organic-inorganic composite by impregnating electrochemically active 4,8-dihydrobenzo [1,2-b:4,5-b’] dithiophene-4,8-dione (BDT) into the pores of 3D cross-linked graphene-based honeycomb carbon (3DGraphene) has been prepared, which not only offers a highly conductive framework with plenty of interconnected pores from the 3D graphene network, but also simultaneously overcomes the two typical drawbacks of organic cathode materials. The excellent confinement effect of the nanopores and the strong π-π interaction between BDT and 3DGraphene largely avoid the dissolution of BDT in the electrolyte. Therefore, the obtained BDT/3DGraphene composite shows a much improved good rate capability (more than 100 mAh g−1 at 4.0C vs less than 50 mAh g−1 for BDT) and cycling stability (about 80% capacity retention at 0.5C while only ∼14% for BDT for 200 cycles), as well as high reversible specific capacity (over 210 mAh g−1).

中文翻译：

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3D交联石墨烯基蜂窝碳复合材料具有优异的锂离子电池有机正极材料的限域效应

摘要 有机正极材料以其丰富、环保、高比容量、低成本和柔性等优点在锂离子电池中受到越来越多的关注。但由于其固有的低电导率和在极性有机电解质中的高溶解度，它们的应用受到了较差的电化学性能的阻碍。在此，通过将具有电化学活性的 4,8-二氢苯并 [1,2-b:4,5-b'] 二噻吩-4,8-​​二酮 (BDT) 浸渍到 3D 交联石墨烯的孔中，形成一种有机-无机复合材料-已经制备了基蜂窝碳（3DGraphene），它不仅提供了具有大量来自 3D 石墨烯网络的互连孔的高导电框架，而且同时克服了有机正极材料的两个典型缺点。纳米孔的优异限制作用以及 BDT 与 3D 石墨烯之间的强 π-π 相互作用在很大程度上避免了 BDT 在电解质中的溶解。因此，获得的 BDT/3DGraphene 复合材料显示出显着改善的良好倍率性能（4.0C 时大于 100 mAh g-1，而 BDT 小于 50 mAh g-1）和循环稳定性（0.5C 时容量保持率约为 80%，而BDT 200 次循环仅约 14%），以及高可逆比容量（超过 210 mAh g-1）。