Graphene is one of the most attractive materials because of its outstanding properties. Here we report a straightforward and environmentally friendly process, in which the few-layer graphene is continuously prepared in gas phase by one-step pyrolysis of methane by alternative-current arc plasma under substrate free and atmospheric conditions. The graphene is generated in high purity with the yield of more than 2 g/h. No further operations such as centrifugation, purification, sonication, and drying are needed. The synthesized graphene powder mainly consists of 1–3 layered flakes. The electrochemical performance of the graphene as the cathode conductive filler for LiFePO₄ lithium ion batteries is investigated. The most effective electron transporting network in lithium ion batteries is obtained under 2% of graphene, together with 1% of carbon black. Moreover, the addition of graphene increases the specific capacity of the cathode and shows a good rate performance.

石墨烯因其出色的性能而成为最有吸引力的材料之一。在这里，我们报告了一种简单且对环境友好的方法，其中在无底物和大气条件下，通过交流电弧等离子体对甲烷进行一步一步热解，在气相中连续制备了数层石墨烯。以高纯度产生石墨烯，产率超过2g / h。不需要进一步的操作，例如离心，纯化，超声处理和干燥。合成的石墨烯粉末主要由1-3层薄片组成。石墨烯作为LiFePO ₄的阴极导电填料的电化学性能研究了锂离子电池。锂离子电池中最有效的电子传输网络是在2％的石墨烯和1％的炭黑下获得的。此外，石墨烯的添加增加了阴极的比容量并显示出良好的倍率性能。