Department of Chemical and Biomolecular Engineering and ‡Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 305-701, Republic of Korea.
Nano Lett. 2014 Aug 13;14(8):4306-13. doi: 10.1021/nl500993q. Epub 2014 Jul 16.
The scalable preparation of graphene in control of its structure would significantly improve its commercial viability. Despite intense research in this area, the size control of defect-free graphene (df-G) without any trace of oxidation or structural damage remains a key challenge. Here, we propose a new scalable route for generating df-G with a controllable size of submicron to micron through sequential insertion of potassium and pyridine at low temperature. Structural and chemical analyses confirm that the df-G perfectly preserves the intrinsic properties of graphene. The Co3O4 (<50 nm) wrapped by ∼ 10.5 μm(2) df-G has unprecedented capacity, rate capability, and cycling stability with capacities as high as 1050 mAh g(-1) at 500 mA g(-1) and 900 mAh g(-1) at 1000 mA g(-1) even after 200 cycles, which suggests enticing potential for the use in high performance lithium ion batteries.
控制结构可规模化制备石墨烯将显著提高其商业可行性。尽管在这一领域进行了深入研究，但在不留下任何氧化或结构损伤痕迹的情况下控制无缺陷石墨烯（df-G）的尺寸仍然是一个关键挑战。在这里，我们提出了一种新的可扩展途径，通过在低温下顺序插入钾和吡啶，生成具有亚微米至微米可控尺寸的 df-G。结构和化学分析证实，df-G 完美地保留了石墨烯的固有特性。由约 10.5 μm(2) df-G 包裹的 Co3O4（<50nm）具有前所未有的容量、倍率性能和循环稳定性，在 500mA g(-1)时高达 1050mAh g(-1)，在 1000mA g(-1)时高达 900mAh g(-1)，即使经过 200 次循环后仍保持如此，这表明其在高性能锂离子电池中的应用具有诱人的潜力。
