Designing the efficient lithium diffusion and storage channels based on graphdiyne. (June 2020)

• Record Type: Journal Article
• Authors: Li, Xiaodong; Wang, Ning; He, Jianjiang; Yang, Ze; Tu, Zeyi; Zhao, Fuhua; Wang, Kun; Yi, Yuanping; Huang, Changshui
• Is Part Of: Carbon. Volume 162(2020)
• Page Start: 579
• Page End: 585
• Publication Date: 2020-06
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2020.03.004
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: We report the first synthesized sp-sp 2 -sp 3 hybridized two-dimensional porous carbon, methyl substituted graphdiyne (MsGDY). The conjugated sp and sp 2 carbons construct a conductive framework and well-distributed pores, and methyl units (sp 3 -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. Graphical abstract: A new two-dimensional carbon material named methyl substituted graphdiyne was synthesized which combines the advantages of three hybrid types of carbon, we designed a two-dimensional carbon material methyl substituted graphdiyne. Nanopores modified by sp 3 carbon in a two-dimensional plane facilitate the diffusion and storage of lithium ions, as do the introduction of fast elevator channels in carbon materials. Experimentally, as an electrode material, it has a high specific capacity and excellent rate performance. In theory, it has a high theoretical capacity of 1701 mA h g −1 and a small diffusion energy barrier. Image 1