Synthesis of Chlorine‐Substituted Graphdiyne and Applications for Lithium‐Ion Storage

Abstract

Chlorine-substituted graphdiyne (Cl-GDY) is prepared through aG laser-Hay coupling reaction on the copper foil. Cl-GDYi se ndowed with au nique p-conjugated carbon skeleton with expanded pore sizei nt wo dimensions,h aving graphdiyne-like sp-and sp 2 -h ybridized carbon atoms.A s ar esult, the transfer tunnels for lithium (Li)i ons in the perpendicular direction of the molecular plane are enlarged. Moreover,b enefiting from the bottom-to-up fabrication procedure of graphdiyne and the strong chemical tailorability of the alkinyl-contained monomer,t he amount of substitutional chlorine atoms with appropriate electronegativity and atom sizei sh igh and evenly distributed on the as-prepared carbon framework, whichw ill synergistically stabilizet he Li intercalated in the Cl-GDYf ramework, and thus generate more Li storage sites.P rofiting from the aboveu nique structure,C l-GDYs hows remarkable electrochemical properties in lithium ion half-cells.

Top-down strategy synthesis of fluorinated graphdiyne for lithium ion battery

“…The results of FTIR are consistent with previous reports. 17,18 Due to the C-F stretching vibration and the aromatic bending vibration, an extra peak at ca. 1098 cm À1 can be observed in the F doped GDY circumstance.…”

“…To meet the requirements in high power density applications, many efforts have been made to enhance the energy density and specic capacity of GDY-based LIBs, such as basenanocrystallization and light elements doping methods. [15][16][17][18][19] The doping method was considered as a simple and effective way to improve electrochemical performance in GDY. Two doping technologies have been reported, including in situ doping and mixing doping.…”

“…As a bottom-up strategy, in situ doping is rstly doping hexaethylbenzene with H, Cl, F atoms and then synthesizing the doped GDY by cross-coupling reaction. [17][18][19] Mixing doping is a top-down strategy by mixing GDY with other materials such as ammonium, boron oxide, ammonium uoride and synthesizing under thermal annealing, heteroatom doped GDY can be obtained. 16,20 The advantage of the bottom-up method is the doping elements can be doped in a uniform manner and form a large hexagonal pore to store up Li.…”

“…The uniformity can extraordinarily improve the electrochemical performance. [17][18][19] However, this method changes the GDY intrinsic structure, and so changes its intrinsic properties. Compared to the in situ doping method, the mixing method keeps the GDY intrinsic structure making it more economic and easy to implement.…”

Miniaturized Energy Storage Devices Based on Two‐Dimensional Materials

“…[70,71] Because of its special electronic structure and narrow band gap properties, graphdiyne has been explored form any electrochemical/photoelectrochemicala pplications, includingL IBs/sodium-ionb atteries and SCs. [72][73][74] In particular, due to triangularh oles, large surface area, and rapid electrolyte ion diffusion of sp-and sp 2 -hybridized carbon atoms, graphdiynes hould be advantageous in boostings pecific power and energy densities for MESDs. Indeed, the reported batteries and SCs based on graphdiyne show excellent performances in terms of energy and power densities, rate capability,a nd long-term stability.…”