Lithium–sulfur (Li–S) batteries are considered as one of the most promising candidates to achieve an energy density of 500 Wh kg⁻1. However, the challenges of shuttle effect, sluggish sulfur conversion kinetics, and lithium‐dendrite growth severely obstruct their practical implementation. Herein, multiscale V2C MXene (VC) with a spherical confinement structure is designed as a high‐efficiency bifunctional promotor for the evolution of sulfur and lithium species in Li–S batteries. Combining synchrotron X‐ray 3D nano‐computed tomography (X‐ray 3D nano‐CT), small‐angle neutron scattering (SANS), and first‐principle calculations, it is revealed that the activity of VC can be maximized by tuning the scale, and the as‐attained functions are conducted as follows: (i) the VC acts as the efficient lithium polysulfide (LiPS) scavenger due to the large number of active sites; (ii) the VC exhibits significantly improved electrocatalytic function for the Li2S nucleation and decomposition reaction kinetics owing to the scale effect; and (iii) the VC can regulate the dynamic behavior of Li‐ions and thus stabilize the lithium plating/stripping effectively on account of the unique ion‐sieving effect.

Dual‐Functional V2C MXene Assembly in Facilitating Sulfur Evolution Kinetics and Li‐Ion Sieving toward Practical Lithium–Sulfur Batteries

Zinc-iodine (Zn-I2) batteries have garnered significant attention for their high energy density, low cost, and inherent safety. However, several challenges, including polyiodide dissolution and shuttling, sluggish iodine redox kinetics, and low electrical conductivity, limit their practical applications. Herein, we designed a highly efficient electrocatalyst for Zn-I2 batteries by uniformly dispersing Ni single atoms (NiSAs) on hierarchical porous carbon skeletons (NiSAs-HPC). In situ Raman analysis revealed that the conversion of soluble polyiodides (I3- and I5-) was significantly accelerated using NiSAs-HPC because of the remarkable electrocatalytic activity of NiSAs. The resulting Zn-I2 batteries with NiSAs-HPC/I2 cathodes delivered exceptional rate capability (121 mAh g-1 at 50 C), and ultralong cyclic stability (over 40 000 cycles at 50 C). Even under 11.6 mg cm-2 iodine, Zn-I2 batteries still exhibited an impressive cyclic stability with a capacity retention of 93.4% and 141 mAh g-1 after 10 000 cycles at 10 C.

Long-Lasting Zinc-Iodine Batteries with Ultrahigh Areal Capacity and Boosted Rate Capability Enabled by Nickel Single-Atom Electrocatalysts.

Batteries are a promising technology in the field of electrical energy storage and have made tremendous strides in recent few decades. In particular, lithium-ion batteries are leading the smart device era as an essential component of portable electronic devices. From the materials aspect, new and creative solutions are required to resolve the current technical issues on advanced lithium (Li) batteries and improve their safety. Metal-organic frameworks (MOFs) are considered as tempting candidates to satisfy the requirements of advanced energy storage technologies. In this review, we discuss the characteristics of MOFs for application in different types of Li batteries. A review of these emerging studies in which MOFs have been applied in lithium storage devices can provide an informative blueprint for future MOF research on next-generation advanced energy storage devices. 

https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/eom2.12283

Metal‐organic framework derived porous structures towards lithium rechargeable batteries

Implanting Single-Atom N2-Fe-B2 Catalytic Sites in Carbon Hosts to Stabilize High-Loading and Lean-Electrolyte Lithium-Sulfur Batteries

Single‐atom electrocatalysts for lithium–sulfur chemistry: Design principle, mechanism, and outlook

The lithium polysulfides (LiPS) dissolution into electrolyte as well as consequent shuttle behavior seriously exacerbate the electrochemical performance of lithium–sulfur batteries. Herein, the intrinsic defect of graphene has been tailored by using plasma irradiation. The topological defective carbon structure is demystified into monovacancy and divacancy which effectively promote Li–S redox kinetics by selectively decelerating the generation of soluble high-order LiPSs and passingly promoting the conversion to final solid products. Theoretical prediction uncovers the selective manipulation of Li–S redox kinetics by defective graphene, facilitating the reduced overpotential effect and uniform deposition of Li2S. Moreover, the divacancy presents a higher activity for Li–S chemistry in contrast with monovacancy. Therefore, the battery achieves superior cyclability with a capacity retention of 88.6% at 1.0 C over 300 cycles. Furthermore, it yields an areal capacity up to 8.5 mAh cm−2 with a sulfur loading of 13.3 mg cm−2. 

Deciphering the defect
 micro‐environment
 of graphene for highly efficient Li–S redox reactions

The viability of lithium‐sulfur (Li–S) batteries toward real implementation directly correlates with unlocking lithium polysulfide (LiPS) evolution reactions. Along this line, designing promotors with the function of synchronously relieving LiPS shuttle and promoting sulfur conversion is critical. Herein, the nitrogen evolution on hierarchical and atomistic Ni–N–C electrocatalyst, mainly pertaining to the essential subtraction, reservation and coordination of nitrogen atoms, is manipulated to attain favorable Li–S pouch cell performances. Such rational evolution behavior realizes the “nitrogen balance” in simultaneously regulating the Ni–N coordination environment, Ni single atom loading, abundant vacancy defects, active nitrogen and electron conductivity, and maximizing the electrocatalytic activity elevation of Ni–N–C system. With such merit, the cathode harvests favorable performances in a soft‐packaged pouch cell prototype even under high sulfur mass loading and lean electrolyte usage. A specific energy density up to 405.1 Wh kg−1 is harvested by the 0.5‐Ah‐level pouch cell.

https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/advs.202204027

Nitrogen Balance on Ni–N–C Promotor for High‐Energy Lithium‐Sulfur Pouch Cells

This paper is being retracted based on publishers' legal criteria. We have received notification from the author, Yonghui Shen, that he had added Dr. Wei Zhang (the first author) as a co-author fraudulently, without his permission or authorization, and that he falsified the confirmation from Dr. Zhang. Dr. Wei Zhang had no contribution to this paper.

/pdf/retracted-mir-26a-5p-regulates-synovial-fibroblast-invasion-1lw7tg3ukv.pdf

Retracted: miR-26a-5p Regulates Synovial Fibroblast Invasion in Patients with Rheumatoid Arthritis by Targeting Smad.

BACKGROUND We studied the expression and effect of miR-26a-5p in synovial fibroblast in patients with rheumatoid arthritis (RA). MATERIAL AND METHODS The synovial tissues of 55 RA patients with total knee arthroplasty performed from January 2016 to December 2016 were collected as the RA group, and 62 patients without RA history amputation or total knee arthroplasty served as the control group. The expressions of miR-26a-5p and Smad 1 mRNA in synovial fibroblast in patients with RA were detected by qPCR; The expression of Smad 1 and TGF-β1 protein in synovial tissue or synovial fibroblasts was detected by immunoblotting. Transwell assay was used to detect the invasive ability of synovial fibroblasts. RESULTS The expression of miR-26a-5p and Smad 1 in synovial fibroblast in patients with RA were significantly higher than those in the control group (P<0.05). The expression of miR-26a-5p in synovial tissue of RA patients was positively correlated with the expression of Smad 1 mRNA (r=0.8982, P<0.001). The luciferase system showed that miR-26a-5p targeting synovial membrane FLS cells (P<0.05); the expression of MMP-1, MMP-3, MMP-13, and TGF-b1 protein and mRNA in the synovial FLS cells of RA patients was significantly decreased; and the expression of miR-26a-5p was significantly decreased in FLS cells with invasive ability. CONCLUSIONS miR-26a-5p is highly expressed in synovial tissue of patients with RA, and its high expression can improve the invasive ability of synovial fibroblasts by targeting Smad 1 gene and accelerating the progression of RA.

miR-26a-5p Regulates Synovial Fibroblast Invasion in Patients with Rheumatoid Arthritis by Targeting Smad 1.

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Deciphering the defect micro‐environment of graphene for highly efficient Li–S redox reactions

Nitrogen Balance on Ni–N–C Promotor for High‐Energy Lithium‐Sulfur Pouch Cells

Retracted: miR-26a-5p Regulates Synovial Fibroblast Invasion in Patients with Rheumatoid Arthritis by Targeting Smad.

miR-26a-5p Regulates Synovial Fibroblast Invasion in Patients with Rheumatoid Arthritis by Targeting Smad 1.