Beijing Institute of Petrochemical Technology

About: Beijing Institute of Petrochemical Technology is a education organization based out in Beijing, China. It is known for research contribution in the topics: Catalysis & Corrosion. The organization has 2468 authors who have published 1937 publications receiving 19270 citations.

Measurement of the absolute branching fraction for Lambda(+)(c) -> Lambda mu(+)nu(mu)

Abstract: We report the first measurement of the absolute branching fraction for Lambda(+)(c) -> Lambda e(+)nu(e). This measurement is based on 567 pb(-1) of e(+)e(-) annihilation data produced at root s = 4.599 GeV, which is just above the Lambda(+)(c)Lambda(-)(c) threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be B(Lambda(+)(c) -> Lambda e(+)nu(e)) = [3.63 +/- 0.38(stat) +/- 0.20(syst)] %, representing a significant improvement in precision over the current indirect determination. As the branching fraction for Lambda(+)(c) -> Lambda e(+)nu(e) is the benchmark for those of other Lambda(+)(c) semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.

Preparation of LiCoO2 cathode materials from spent lithium–ion batteries

Abstract: Preparation of LiCoO2 cathode materials from spent lithium–ion batteries are presented. It started with the reclaim/recycle of metal values from spent lithium–ion batteries, which involves the separation of electrode materials by ultrasonic treatment, acid dissolution, precipitation of cobalt and lithium, followed by the preparation of LiCoO2 cathode materials. Co (99.4%) and Li (94.5%) were recovered from spent lithium–ion batteries. The LiCoO2 cathode materials prepared from the reclaimed cobalt and lithium compounds showed good elecrtochemical performance. The reclaiming of cobalt and lithium has a promising outlook for the recycling of cobalt and lithium from spent Li–ion batteries, thus reducing the cost of Li–ion batteries.

Hydrothermal synthesis of protective coating on magnesium alloy using de-ionized water

Abstract: High corrosion rate is the “Achilles' heel” of magnesium and its alloys, which has severely limited their applications. Coating on these kinds of materials is an effective way to overcome this weakness. Protective coatings were successfully synthesized on AZ31 magnesium alloy by the hydrothermal method with de-ionized water as mineralizer in this paper. The structure, morphology, and composition of the coatings were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and energy-dispersive spectroscopy (EDS), respectively. Potentiodynamic polarization tests and immersion tests for 7 and 14 days in 3.5 wt.% NaCl aqueous solution at room temperature were conducted to evaluate anti-corrosion abilities of coatings. The influences of hydrothermal temperature and time on the thickness of the coating and corrosion resistance were investigated. The results show that the coatings are uniform and compact, composed of hexagonal magnesium hydroxide (Mg(OH)2) and a spot of monoclinic aluminum magnesium hydroxide (Mg2Al(OH)7). The thickness of coating varied from 2.2 μm to 27.2 μm, increasing with the hydrothermal temperature and time. Polarization curves and results of immersion tests of coated and uncoated AZ31 substrates demonstrate that coatings can improve the corrosion resistance effectively and the corrosion resistances are mainly increased with the thicknesses of the coatings and increased with hydrothermal temperature if the thicknesses are very close to each other. The static water contact angles of the coatings are all less than 13.5°, whereas that of the substrate is 40.5°, indicating that the coatings are highly hydrophilic. Tape test further verifies that there is a strong adhesion between the coating and the substrate.