No abstract

In this study, a jumbo silicon/silicon carbide (Si/SiC) composite (JSC), a novel anode material source, was extracted from solar power industry cutting waste and used as a material for lithium-ion batteries (LIBs), instead of manufacturing the nanolized-Si. Unlike previous methods used for preventing volume expansion and solid electrolyte interphase (SEI), the approach proposed here simply entails applying surface modification to JSC-based electrodes by using nitrogen-atmospheric pressure plasma jet (N-APPJ) treatment process. Surface organic bonds were rearranged and N-doped compounds were formed on the electrodes through applying different plasma treatment durations, and the qualitative examinations of before/after plasma treatment were identified by X-ray photoelectron spectroscopy (XPS) and electron probe microanalyzer (EPMA). The surface modification resulted in the enhancement of electrochemical performance with stable capacity retention and high Coulombic efficiency. In addition, depth profile and scanning electron microscope (SEM) images were executed to determine the existence of Li-N matrix and how the nitrogen compounds change the surface conditions of the electrodes. The N-APPJ-induced rapid surface modification is a major breakthrough for processing recycled waste that can serve as anode materials for next-generation high-performance LIBs.

SynopsisCarbon fiber surfaces were coated in various thickness with polyamic acids (PAA) prepared from ( 1 ) benzophenone tetracarboxylic dianhydride (BTDA) and 4,4'-diaminodiphenyl ether (ODA) , (2) BTDA and 4,4'-diaminodiphenyl sulfone (DAS), and ( 3 ) BTDA and ODA modified with bisaminopropyldisilane, designated as PAA-1, PAA-2 and PAA-3 respectively. The treated carbon fiber, with or without imidization, was embedded in thermoplastic polyetheretherketone (PEEK), polyetherimide (PEI), polyethersulfone (PES), polysulfone (PSF), and polyphenylsulfide (PPS) by the microbond method, and the interfacial shear strength was measured by pulling out the fiber from the embedded resin. Maximum increments in interfacial bonding strength from 24% to 35% were obtained from PAA-1 in PEEK and PEI, PAA-2 in PEEK, PEI, PSF, and PPS, and PAA-3 in PEEK and PES. Imidization of PAA-1 and PAA-2 before resin application reduced their bonding capability. A linear relationship between the length of the embedded fiber and debonding load was found in the case of PEEK, PEI, and P S F scattered results were obtained in the case of PES and PPS. Inadequate specimen annealing was believed to be the cause for PES, Brittle fracture appeared to occur in the case of PPS.

Robust stalagmite-like self-cleaning surfaces with good transparency and flexibility are developed by plasma-assisted nanofabrication and silanization under ambient conditions.

No abstract