Scalable synthesis of N/S co-doped hard carbon microspheres as a high-performance anode material for sodium-ion batteries.

Hard carbon is a promising anode material for sodium-ion batteries (SIBs) due to its abundance. However, it exhibits low reversible capacity and slow kinetics if inappropriate microstructural features are developed during synthesis. Herein, N/S co-doped phenolic resin-based hard carbon microspheres are prepared by a scalable strategy, and the electrochemical performance is assessed both in half cells and full cells. We demonstrate that the expanded interlayer spacing, the increased active sites, and the enhanced capacitive behavior result in the enhanced reversible capacity and promoted kinetics for Na+storage. The sample with appropriate doping amount exhibits an initial charge capacity of 536.8 mAh g-1at 50 mA g-1and maintains 445.9 mAh g-1after 1000 cycles at a current density of 1 A g-1in a Na-metal half cell. Coupled with a carbon-coated Na4Fe3(PO4)2P2O7(NFPP) cathode, the full cell exhibits a capacity of 92.5 mAh g-1after 90 cycles, with a capacity retention of 91.6%. This work provides a facile and scalable method for synthesizing high-performance hard carbon anode materials for SIBs.

Silent pelvic splenosis: Case report.

INTRODUCTION: Splenosis is a benign, usually asymptomatic, condition involving autotransplantation of splenic tissue that occurs frequently after splenic rupture caused by trauma or surgery [1]. Up to 67% of the patients presenting splenic rupture may develop splenosis [2]. The interval of time between the initial trauma and the diagnosis varies from 3 to 45 years with an average interval of 21 years [3]. Since the finding of this entity is usually accidental, the real incidence is not well known. Although splenosis following traumatic splenectomy after traffic accidents is well-documented in the literature, there do not seem to be many reported cases where splenosis produced gynecological complications [4]. There were fewer than 100 cases of splenosis reported since the first report of Buchbinder and Lipkoff in 1939 [5] in the English language medical literature of which only a minority appeared in the gynecological literature. PRESENTATION OF CASE: A case of pelvic and omentum majus splenosis in a patient is presented. DISCUSSION: Pelvic splenosis remains a rare finding in clinical practice. In most reported cases in the literature, the diagnosis was not considered before surgery. This approach may obviate the need for invasive evaluation for a primary or secondary neoplasm, and thus unnecessary surgery, and therefore preserve probable functional splenic tissue. Our case was diagnosed using non-surgical modalities. CONCLUSION: Our case emphasizes the rare diagnosing of pelvic splenosis in the evaluating pelvic mass with the tissue evidence instead of surgery.