Zhang Jianyu, Shin Hosop, Lu Wei
Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.
Department of Mechanical and Energy Engineering, Indiana University-Purdue University-Indianapolis, Indianapolis, Indiana 46202, United States.
ACS Appl Mater Interfaces. 2021 Jun 9;13(22):25946-25959. doi: 10.1021/acsami.1c03583. Epub 2021 May 24.
We show a top-down synthesis approach to mass-produce phosphorene-graphene nanosheet composites with superior cycle stability and rate capability. Currently, using exfoliation to achieve two-dimensional (2D) materials is primarily limited to pure crystals. We discover that high-quality nanoscale 2D composite phosphorene-graphene sheets can be directly exfoliated from extremely low-cost bulk three-dimensional (3D) black phosphorus-graphite composites synthesized by mechanical milling while maintaining the chemical bonding and intimate electronic contact between 2D composite layers. The hybrid phosphorene-graphene material delivers high reversible capacities of 2030, 2003, and 1597 mAh/g at high current densities of 2, 4, and 6 A/g, respectively. Quantifying the dimensional electrochemical performance, we show that 2D phosphorene-graphene nanosheets not only have excellent electrochemical kinetics for fast lithium-ion diffusion and storage but also maintain the overall structural robustness of the entire electrode for long-term cyclability. This scalable synthesis paves the way for the practical application of phosphorene-graphene materials in batteries.
我们展示了一种自上而下的合成方法，用于大规模生产具有卓越循环稳定性和倍率性能的磷烯-石墨烯纳米片复合材料。目前，通过剥离来制备二维（2D）材料主要局限于纯晶体。我们发现，高质量的纳米级二维磷烯-石墨烯复合片材可以直接从通过机械研磨合成的极低成本块状三维（3D）黑磷-石墨复合材料中剥离出来，同时保持二维复合层之间的化学键合和紧密的电子接触。这种磷烯-石墨烯混合材料在2、4和6 A/g的高电流密度下分别具有2030、2003和1597 mAh/g的高可逆容量。通过量化二维电化学性能，我们表明二维磷烯-石墨烯纳米片不仅具有用于快速锂离子扩散和存储的优异电化学动力学，而且还能保持整个电极的整体结构稳健性以实现长期循环稳定性。这种可扩展的合成方法为磷烯-石墨烯材料在电池中的实际应用铺平了道路。
