Enabling a High Performance of Mesoporous α-Fe₂O₃ Anodes by Building a Conformal Coating of Cyclized-PAN Network

Abstract

The mesoporous α-Fe2O3/cyclized-polyacrylonitrile (C-PAN) composite was synthesized by a rapid and facile two-step method. The electrode was fabricated without conductive carbon addictive and employed as anode for lithium-ion batteries. Results demonstrate that building a conformal coating of a C-PAN network can provide a strong adhesion with active materials and contribute excellent electronic conductivity to the electrode, which can relieve the huge volume changes during a lithiation/delithiation process and accelerate the charge transfer rate. The material exhibited high reversible capacity of ca. 996 mAh g(-1) after 100 cycles at 0.2C, 773 mAh g(-1) at 1C and 655 mAh g(-1) at 2C, respectively, showing well-enhanced cycling performance and superior rate capacity, and also exhibiting significantly improved power density and energy density compared to the traditional graphite materials. Our results provide a facile and efficient way to enhance the performance of α-Fe2O3 anode material, which also can be applied for other oxide anode materials.

Enhanced performance of alpha‐Fe 2 O 3 nanoparticles with optimized graphene coated layer as anodes for lithium‐ion batteries

“…Indeed, the structures of the untreated α‐Fe 2 O 3 nanoparticles are also found to be broken and collapsed, while the morphology and structure of α‐Fe 2 O 3 @graphene (40%) electrode sample remains largely unchanged, retaining its three‐dimensional network structure. These results reveal that the coated graphene can efficaciously alleviate the expansion of α‐Fe 2 O 3 materials and retain the structure and promote their electrochemical performance …”

“…These results reveal that the coated graphene can efficaciously alleviate the expansion of α-Fe 2 O 3 materials and retain the structure and promote their electrochemical performance. 64 To further analyze the chemical structure of the electrode material after cycling, XPS analysis of a cycled α-Fe 2 O 3 @graphene (40%) sample was carried out. As shown in Figure S7, the peaks of Fe 2p 3/2 , Fe 2p 1/2 , and their satellite peak are observed at 711.4, 724.2, and 718.8 eV, respectively.…”

One-Step Self-Assembly Synthesis α-Fe2O3 with Carbon-Coated Nanoparticles for Stabilized and Enhanced Supercapacitors Electrode

“…The morphology and structure of Fe 2 O 3 @C sample were almost unchanged and still maintained the cocoon-shaped oval spherical structure. This further illustrated that the carbon coating can effectively buffer the volume expansion of Fe 2 O 3 material to maintain structural stability and improve electrical properties [53].…”

GPCR6A Is a Molecular Target for the Natural Products Gallate and EGCG in Green Tea

“…Green tea ( Camellia sinensis L.) consumption is reported to have multiple health benefits, including reducing the risks for developing metabolic syndrome (MetS), type 2 diabetes (T2D), and prostate cancer (PCa), as well as many others . Gallates represent 50% of the naturally occurring polyphenolic compounds in green tea and are also present in gallnuts, wine, chocolate, fruits, and vegetables …”