Fe₂P-decorated N,P Codoped Carbon Synthesized via Direct Biological Recycling for Endurable Sulfur Encapsulation

Abstract

In spite of the great potential in leading next-generation energy storage technology, Li–S batteries suffer rapid capacity decay arising from the shuttling effect of lithium polysulfides (LiPSs), a major concern that must be addressed before commercialization can be realized. To tackle this challenge, we demonstrate a facile approach to fabricate a hierarchically structured composite of Fe 2 P@nitrogen, phosphorus codoped carbon (Fe 2 P@NPC) by direct biological recycling of iron metal from electroplating sludge using bacteria. This material, featuring uniform dispersion of Fe 2 P nanoparticles (NPs) in porous NPC matrix, effectively adapts volume variation of sulfur upon cycling and simultaneously provides multiple channels for efficient lithium ion transport. In addition, Fe 2 P NPs with strong adhesion properties of tightly anchored soluble LiPSs formed during discharge can significantly facilitate the decomposition of Li 2 S during the subsequent charging process. The Li–S cell built on this cathode architecture delivers high specific capacity (1555.7 mAh g –1 at 0.1 C), appreciable rate capability (679.7 mAh g –1 at 10 C), and greatly enhanced cycling performance (761.9 mAh g –1 at 1.0 C after 500 cycles).

Tannic acid based super‐intumescent coatings for prolonged fire protection of cardboard and wood

“…Detailed analysis of the XPS spectra for different elements reveals that the PER char has more P content (16.15 at%) than TA char (P: 12.38 at%) and a higher proportion of P atoms in PER char is bonded with O atoms. [ 44,45 ] This explains the presence of higher O content (42.66 at%) in PER char than that in TA char (O: 29.29 at%). Moreover, the N content is higher in TA char (N: 3.63 at%) than that in PER char (N: 1.56 at%).…”

Laser Cladding Induced Spherical Graphitic Phases by Super-Assembly of Graphene-Like Microstructures and the Antifriction Behavior

“…The bonding quality of the coating to the substrate is mainly influenced by the dilution rate (η), calculated via η = A 1 /(A 1 + A 2 ), where A 1 is the melting area of the substrate and A 2 is the cladding area. A total of 11 specimens are studied (Table S1), including nine specimens from a group of orthogonal experiments (L9, 3 3 ), where the laser power, scanning velocity, Scanning electron microscopy (SEM) was employed to visualize the cross-section morphologies of the individual laser cladding tracks obtained under different process parameters and precursor material compositions (Figure 2). The results indicate that all the coatings are bonded well with the substrates with well-defined transition zones between the coating and the substrate.…”

A Review of Heteroatom Doped Materials for Advanced Lithium–Sulfur Batteries

“…N and B doping prefer to enhance the immobilization capability of LiPSs, while S and P doping prefer to offer the electrocatalytic activity. [ 35,37 ] Therefore, co‐doping can make the most of the advantages of different heteroatom doping. In addition, the doped configuration has a great influence on the properties of sulfur hosts.…”

“…Actually, the incorporation of P doping also played a critical role in catalyzing LiPSs conversion to promote the redox kinetics. [ 35 ] Different from N, B, and P doping, S doping played a different role in promoting electrochemical performance of Li‐S batteries. [ 36 ] Hu's group [ 37 ] prepared the hierarchical S‐doped carbon nanocages (hSCNCs) with large surface area of 1296 m 2 g −1 and high pore volume of 3.91 cm 3 g −1 .…”

“…Although both N and P doping can promote the immobilization capability of LiPSs and provide electrocatalytic activity to sulfur redox reaction, there exists the apparent difference in the improvement degree. [ 9 ] Lu's group [ 35 ] compared the binding energies of LiPSs and the decomposition energy barriers of Li 2 S on the surface of un‐doped carbon, N‐doped carbon, and P‐doped carbon based on DFT calculation. Among three kinds of carbon materials, N‐doped carbon exhibited the highest Li 2 S 6 binding energy of 1.012 eV, which was higher than that of carbon (0.152 eV) and P‐doped carbon (0.300 eV), while there existed the lowest energy barrier of Li 2 S decomposition for P‐doped carbon (0.66 eV) compared with non‐doped carbon (1.85 eV) and N‐doped carbon (1.40 eV).…”