Cu-supported nitrogen-doped carbon nanofibers with hierarchical three-dimensional net structure as binder-free anodes for enhanced lithium-ion batteries

Abstract

Cu-supported nitrogen-doped carbon nanofibers (NCNFs) were fabricated via electrospinning and subsequent activation treatment with poly vinylpyrrolidone as both carbon and nitrogen sources. The NCNFs are firmly adhered to Cu foil without any additional binder and form a hierarchical three-dimensional net structure, which could effectively shorten the diffusion paths for electrons and lithium ions, thus resulting in lower impedance and superior electrochemical properties. Additionally, NCNFs feature a amorphous carbon structure, N-rich carbon lattice and wide pore distribution, not only ensuring fast ions/electrons transport, but also giving rise to the higher energy density. When directly used as a binder-free electrode, NCNFs deliver a high reversible capacity of 617.8 mAh g−1 at 200 mA g−1 after 100 cycles and maintain a superior capacity of 274.1 mAh g−1 at 1.44 A g−1 even after 500 cycles. Besides, the reversible capacity up to 216.5 mAh g−1 can be still obtained at a high current density of 6 A g−1, demonstrating the excellent high-rate cyclability. The facile synthesis approach and superior electrochemical properties make NCNFs electrodes an alternative anode candidate for lithium-ion batteries.

Dehydrogenation of bioethanol using Cu nanoparticles supported on N‐doped ordered mesoporous carbon

“…These factors could attribute to the effect of N-doping on Cu. [20,37] Figure 8 shows the XPS analysis of the Cu 2p 3/2 photopeaks of 3Cu/NMCs and 3Cu/AC. The materials 3Cu/NMC-2 and 3Cu/ NMC-7 showed a narrow Cu + /CuO peaks in XPS and the intensity of Cu 2 + satellite peak was less in both samples.…”

Advanced Matrixes for Binder‐Free Nanostructured Electrodes in Lithium‐Ion Batteries

“…In order to eliminate the negative effects of conventional binders and simplify the fabrication procedure, metal-substrate-based binder-free nanostructured electrodes are usually fabricated by growing active materials (e.g., Li 4 Ti 5 O 12 , carbonbased materials, metal oxides, sulfides, layer-structured LiCoO 2 , spinel LiMn 2 O 4 , and olivine LiFePO 4 ) on metal-based substrates directly without additional polymer binders and conductive additives, through various preparation methods. In general, metal-based substrates can be classified into two categories: 2D planar substrates (e.g., foils of Cu, [48][49][50][51][52][53] Fe, [54] Ti, [55][56][57][58] Ta, [59] Ni, [60,61] Pt, [62] stainless steel, [63,64] and other alloying metals [65][66][67] ) and 3D porous substrates (e.g., Ni foam, [68,69] Cu mesh, [70] and Cu foam [71,72] ).…”

“…Each substrate has been evaluated from the aspect of capital cost (C), loading mass of active materials (L), flexibility (F), mechanical strength (M) and discharge capacity (D: common active materials loaded on the substrate). [48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64] [109] Copyright 2014, Springer Nature.…”

Graphene‐integrated CuCo 2 S 4 microspheres as a sustainable anode material for high‐performance Li‐ion batteries

“…A highly flexible and conductive nature of graphene helps releases unwanted elongation/shrinkage of metal sulfides upon cycling, reducing active material dissolution and improving electron transport. Moreover, the graphene incorporated composite structure can possesses high mechanical strength, large active surface area, and rich redox chemistry that can leads to enhanced capacity and better endurance throughout the cycle life 21‐27 . In order to solve the capacity fading issue of metal sulfide‐based anodes, Tian et al reported porous core shell CuCo 2 S 4 nanospheres as an anode whose first specific discharge capacity was 1599.9 mAh g −1 at 1 A g −1 but decreased quickly within 100 cycles up to 400 mAh g −1 approximately 9 .…”

“…Moreover, the graphene incorporated composite structure can possesses high mechanical strength, large active surface area, and rich redox chemistry that can leads to enhanced capacity and better endurance throughout the cycle life. [21][22][23][24][25][26][27] In order to solve the capacity fading issue of metal sulfide-based anodes, Tian et al reported porous core shell CuCo 2 S 4 nanospheres as an anode whose first specific discharge capacity was 1599.9 mAh g −1 at 1 A g −1 but decreased quickly within 100 cycles up to 400 mAh g −1 approximately. 9 Rakesh et al proposed an in situ carbon decorated CuCo 2 S 4 (CuCo 2 S 4 /C) anode to solve this capacity fading issue.…”