A novel composite of SnO nanoparticles and SiO2@N-doped carbon nanofibers with durable lifespan for diffusion-controlled lithium storage

Hierarchical MoS2 Nanotubes Supported by Tubular CoS2 on Carbon Cloth as Flexible Electrodes for Durable Lithium-Ion Storage

“…The low-frequency resistance has the following linear relationship with ω −1/2 Z′ = K + σω −1/2 , where K is a constant and ω corresponds to the frequency, so the Warburg coefficient σ in different cycle stages can be obtained from the curve in Figure S5c. 56 The lithiumion diffusion coefficient can be further confirmed by the specific equation…”

“…In addition, the linear part of the low-frequency region represents the Warburg impedance ( W ), which is related to the diffusion of lithium ions. The low-frequency resistance has the following linear relationship with ω –1/2 Z ′ = K + σω –1/2 , where K is a constant and ω corresponds to the frequency, so the Warburg coefficient σ in different cycle stages can be obtained from the curve in Figure S5c . The lithium-ion diffusion coefficient can be further confirmed by the specific equation where R is the gas constant (8.314 J mol –1 K –1 ), T is the absolute temperature (298.15 K), and F is the Faraday constant (96 486 C mol –1 ).…”

Advanced Carbons Nanofibers‐Based Electrodes for Flexible Energy Storage Devices

“…[88] Doping heteroatoms (N, S, P, and B) in carbon-based materials can significantly improve conductivity and electrochemical reactivity through changing electron distribution, thereby increasing the storage capacity and rate performance of lithium ions. [104] For example, Yang et al [96] applied filter paper as a precursor to fabricate a flexible, interwoven N and P double-doped carbon fibers/graphite carbon nitride (huCP/g-C 3 N 4 ), demonstrating a specific capacity of 1030 mAh g −1 at 1 A g −1 after 1000 cycles, arising from the presence of high-conductivity carbon nitride as well as high N and P doping content, and an increase in active sites to expand the layer plane and provide an interconnected conductive network. Tang et al [80] prepared a composite flexible electrode with carbon fibers coated with exfoliated porous N-doped carbon fibers (denoted as CF/ECF/ECF) as the streamer, NiO as the active layer, and carbon quantum dots (CDs) as the stabilizer (CF/ECF/NiO/CD).…”

温度调控制备锡或二氧化锡@中空多孔碳纳米纤维电极用于个性化定制锂离子电池

“…In this regard, core-shell structure and various Sn/carbon and SnO 2 /carbon nanocomposites, wherein Sn or SnO 2 is confined in carbon nanotubes, nanofibers, and graphene layer, have been reported to accommodate the large volume changes and facilitate stable SEI formation [32][33][34][35][36][37][38][39]. However, Li-ion diffusion is blocked by outer carbon coating, nanotubes, nanofibers, and graphene, limiting the electrochemical performance [38,[40][41][42][43][44][45]. Thus, embedding nanostructured Sn-based electrode materials into the porous matrix is a potential strategy to enhance the Li-ion diffusion kinetics [46][47][48][49][50].…”