Influence of Atomic Deposition Surface Modification Technology on the Cycle Efficiency and Capacity of Lithium Ferrous Silicate Cathodes for Lithium-ion Batteries
Wang Qingsheng,
Povel Nivokov,
Anadoli Popovich,
Yu Yao,
Yang Zhelong
Issue:
Volume 7, Issue 1, June 2022
Pages:
1-7
Received:
15 December 2021
Accepted:
7 January 2022
Published:
12 January 2022
DOI:
10.11648/j.ajmsp.20220701.11
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Abstract: This article explored the use of atomic layer deposition to deposit cathode material LF(M)S coated with nano-scale Al2O3(C) film by growth coating, and successfully obtained the composite LF(M)S coated with Al2O3 (C) cathode material. The test results of various electrochemical performance parameters show that the surface modification treatment method can effectively improve the various electrochemical properties of the cathode material. The synthesized LF(M)S was analyzed by a Time of Flight Secondary Ion Mass Spectrometer, and a clear topography and three-dimensional topography of the surface coated with Al2O3 and C were obtained; the surface morphology and uniformity of the deposited layer were studied by Atomic Force Microscope and the crystal structure of the material was analyzed by XRD. The electrochemical performance of the battery assembled with the positive electrode material was characterized by an electrochemical workstation and a charge-discharge tester. The results showed that the surface coating can effectively prevent the side reaction between the material and the electrolyte at high voltage, and reduce the irreversible capacity loss in the first charge and discharge process, because the chemical properties of the coating are not active. At the same time, due to the stable structure and good conductivity of the coating material, the stability of the structure during charging and discharging of the material is maintained, thereby reducing the loss of battery capacity, maintaining good conductivity between the material particles, and improving the cycle performance of the material.
Abstract: This article explored the use of atomic layer deposition to deposit cathode material LF(M)S coated with nano-scale Al2O3(C) film by growth coating, and successfully obtained the composite LF(M)S coated with Al2O3 (C) cathode material. The test results of various electrochemical performance parameters show that the surface modification treatment met...
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An Electron Bombardment Photodisintegration Spectrum Analysis of 3-Amino 6-methoxyl-2-MethylQuinazolin-4-(3H)-one Derivative
Osarumwense Peter Osarodion,
Ayedun Hassan,
Arigbede John
Issue:
Volume 7, Issue 1, June 2022
Pages:
8-14
Received:
22 December 2021
Accepted:
8 January 2022
Published:
12 March 2022
DOI:
10.11648/j.ajmsp.20220701.12
Downloads:
Views:
Abstract: Background: The synthesis of new heterocyclic derivatives has attracted considerable attention. The explosive growth of heterocyclic chemistry is emphasized by the large number of research publications, monographs, and reviews. The heterocyclic organic compounds are extensively disseminated in natural and synthetic medicinal chemistry and are vital for human life. Looking at the previous studies on quinazolinones derivatives, only limited information is available on their mass spectral along with the preparation of novel quinazolin-4-(3H)-one derivatives. Objective: Aspiration of this investigation, was to synthesize a new 3-Amino-2-Methyl-6-methoxy-quinazolin-4-one was synthesized via the reaction between 2-Methyl-6-methoxy-benzo-1,3-oxazin-4-one and hydrazine hydrate and investigate their electron impact (EI) mass spectral disintegration. Method: The consolidation of 2-amino-methyl-5methoxybenzoate with acetic anhydride yielded the cyclic compound 2- methyl-4, 5-disubstituted-1, 3-benzo-oxazine-4-one which then produce a novel 2,3-disubstituted quinazolin-4 ones via the reaction with hydrazine hydrate. The compounds synthesized were enormously confirmed by means of Infrared, Nuclear Magnetic Resonance (1H and 13C), Gas Chromatography Mass Spectrophotometer and Elemental analysis. Discussion: The molecular ion of m/z 205 splints to give m/z 190 by loss of –NH group. The ion of m/z 190 was broken to give m/z 177 by losing CH group. This fragmented to m/z 162 by loss of –CH3 group and then m/z 136 by loss of CN group. The loss of O gave m/z 120 which fragment to give m/z 93 by loss of –HCN and finally gave m/z 65 by loss of CO group. Conclusion: The electron impact ionization mass spectra of compound 2 show a weak molecular ion peak and a base peak ofm/z 205 resulting from a break up fragmentation. Compound 2 give a characteristic fragmentation pattern. From the examination of the mass spectra of compound 2, it was found that the molecular ion had fragmented to the m/z 190. The final disintegration led to ion of m/z 93 and ion of mass m/z 65, respectively.
Abstract: Background: The synthesis of new heterocyclic derivatives has attracted considerable attention. The explosive growth of heterocyclic chemistry is emphasized by the large number of research publications, monographs, and reviews. The heterocyclic organic compounds are extensively disseminated in natural and synthetic medicinal chemistry and are vital...
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