摘要
A lithium-assisted approach has been developed for the exfoliation of pristine graphite, which allows the large-scale preparation of few-layer graphene nanosheets. The process involves an unexpected physical insertion and exfoliafion, and the graphene nanosheets prepared by this method reveal undisturbed sp2-hybridized structures. A possible two-step mechanism, which involves the negative charge being trapped around the edges of the graphite layers and a subsequent lithiation process, is proposed to explain the insertion of lithium inside the graphite interlayers. If necessary, the present exfoliation can be repeated and thinner （single or 2-3 layer） graphene can be achieved on a large scale. This simple process provides an efficient process for the exfoliation of pristine graphite, which might promote the future applications of graphene.
一条帮助锂的途径为太古的石墨的脱落被开发了，它允许很少层 graphene nanosheets 的大规模准备。这个过程包含意外物理插入和脱落，和这个方法准备的 graphene nanosheets 揭示没受到干扰的 sp < 啜 class= “ a-plus-plus ” > 2 </sup>-hybridized 结构。可能的二拍子的圆舞机制，包含在石墨层和一个随后的 lithiation 过程的边附近被套住的否定费用，被建议在石墨夹层内解释锂的插入。如果必要，现在的脱落能被重复并且更薄(单身者或 23 层) graphene 能在大规模上被完成。这个简单过程为太古的石墨的脱落提供一个有效过程，它可能支持 graphene 的未来应用程序。
基金
This work was supported by the National Natural Science Foundation of China （No. 51222104） and the Fundamental Research Funds for the Central Universities.
