Hard carbon is generally accepted as the choice of anode material for sodium-ion batteries. However, integrating high capacity, high initial Coulombic efficiency (ICE), and good durability in hard carbon materials remains challenging. Herein, N-doped hard carbon microspheres (NHCMs) with abundant Na adsorption sites and tunable interlayer distance are constructed based on the amine-aldehyde condensation reaction using m-phenylenediamine and formaldehyde as the precursors. The optimized NHCM-1400 with a considerable N content (4.64%) demonstrates a high ICE (87%), high reversible capacity with ideal durability (399 mAh g at 30 mA g and 98.5% retention over 120 cycles), and decent rate capability (297 mAh g at 2000 mA g ). In situ characterizations elucidate the adsorption-intercalation-filling sodium storage mechanism of NHCMs. Theoretical calculation reveals that the N-doping decreases the Na adsorption energy on hard carbon.
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http://dx.doi.org/10.1002/smll.202303790 | DOI Listing |
J Environ Manage
December 2024
Air Liquide, Brussels, Belgium. Electronic address:
The operation of a reverse osmosis (RO) system is often severely hindered by the deposition of inorganic scales such as calcium carbonate on the membrane surface. Mitigation of this scaling phenomenon requires suitable pH control strategies, with the use of strong mineral acids (e.g.
View Article and Find Full Text PDFJ Colloid Interface Sci
December 2024
School of Materials Science and Engineering, State Key Lab of Silicon and Advanced, Semiconductor Materials, Zhejiang University, Hangzhou 310027, PR China. Electronic address:
NaMnTi(PO) is a promising sodium-ion cathode material due to its relatively high specific capacity, excellent thermodynamic stability and low cost. However, unfavorable electron conductivity and slow kinetics limit its practical application. Here, a strategy of hetero and multivalent anion substitution is proposed to achieve high-rate performance and good capacity retention.
View Article and Find Full Text PDFSci Rep
December 2024
Department of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin, 150040, People's Republic of China.
The effect of carbon fibers (Cf) and Ni nanoparticles addition on the melting point, microstructure, shear strength, indentation hardness and indentation creep of SnBi/Cu solder joints were explored. Composite solder with various Cf percentages (0, 0.02, 0.
View Article and Find Full Text PDFInt J Nanomedicine
December 2024
Shanxi Medical University School and Hospital of Stomatology; Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Taiyuan, Shanxi, 030001, People's Republic of China.
Purpose: During fixed orthodontic treatment, oral hygiene is difficult to ensure and can easily lead to an imbalance in the oral micro-ecological balance. In this study, based on the adhesive properties of polydopamine (PDA) and the good antimicrobial and remineralization properties of carboxymethyl chitosan (CMC) and xylitol (Xy), new nanocomposites with both antimicrobial and remineralization capabilities were prepared to coat on orthodontic brackets.
Methods: Composite carbon dots (CDs) were synthesized using carboxymethyl chitosan and xylitol, we characterized them and the antimicrobial properties of the CMC-Xy-CDs were investigated by co-cultivation with S.
Nanomaterials (Basel)
December 2024
School of Power & Mechanical Engineering, Wuhan University, Wuhan 430072, China.
TiZrMoC coatings were deposited on Si(100) substrates using a DC dual magnetron sputtering. The composition was controlled by adjusting the sputtering parameters of the TiZrMo and graphite targets. The influence of graphite target current on the resulting coating properties was explored.
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