Abstract We report the first synthesized sp-sp2-sp3 hybridized two-dimensional porous carbon, methyl substituted graphdiyne (MsGDY). The conjugated sp and sp2 carbons construct a conductive framework and well-distributed pores, and methyl units (sp3-C) are introduced into the well-distributed pores by coupling on benzene ring, which directly results in enlarged layer spacing (0.41 nm). Combining the advantages of three hybrid carbons in one, MsGDY provides much more lithium storage sites (theoretical capacity of 1701 mAh g−1) and lower lithium ion diffusion barriers than those of existed carbon materials. The experimental results confirm that MsGDY has high capacity for Li storage (1020 mA g−1 at the current of 50 mA g−1) and excellent rate performance. The studies indicate that MsGDY is a novel candidate as an anode for lithium-ion batteries (LIBs), and the rational introduction of carbon with different hybrid forms can be of great meaningful for the design of new carbon-based 2D materials.

中文翻译：

---

基于石墨炔的高效锂扩散和存储通道设计

摘要 我们报告了第一个合成的 sp-sp2-sp3 杂化二维多孔碳，甲基取代的石墨炔 (MsGDY)。共轭的 sp 和 sp2 碳构成了一个导电骨架和分布均匀的孔，甲基单元（sp3-C）通过与苯环偶联引入到分布均匀的孔中，直接导致层间距扩大（0.41 nm）。将三种混合碳的优点合二为一，MsGDY 提供了比现有碳材料更多的锂存储位点（理论容量为 1701 mAh g-1）和更低的锂离子扩散势垒。实验结果证实，MsGDY 具有高容量的锂存储（在 50 mA g-1 的电流下为 1020 mA g-1）和优异的倍率性能。