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Your search keyword '"Li, Yujiao"' showing total 30 results
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30 results on '"Li, Yujiao"'

8. Preparation of gel polymer electrolyte with high lithium ion transference number using GO as filler and application in lithium battery

Author

Cheng-an Tao, Hang Gong, Li Yujiao, Xianzhe Chen, Xiaoming Zhao, and Jianfang Wang

Subjects
chemistry.chemical_classification, Materials science, Graphene, General Chemical Engineering, General Engineering, General Physics and Astronomy, 02 engineering and technology, Polymer, Electrolyte, Conductivity, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, Lithium battery, 0104 chemical sciences, law.invention, chemistry, Chemical engineering, law, General Materials Science, 0210 nano-technology, Separator (electricity), Electrochemical window
Abstract

High lithium ion transference number (tLi+) is one of the requirements of polymer electrolytes for utilization in lithium secondary batteries. Herein, graphene oxide (GO) is used as a filler to fabricate the homogeneous gel polymer electrolyte (GPE) for pursuing high tLi+. The effect of GO on the whole properties of gel polymer electrolytes including conductivity, lithium ion transference number, electrochemical window, electrochemical stability, and cycling performance are explored. Impressively, the GPE containing 0.3 wt% of GO (labeled as GPE-0.3%) demonstrates a high lithium ion transference number of 0.79 and improved electrochemical stability. The LFP/Li battery with GPE-0.3% as the separator shows excellent electrochemical cycle stability and Coulomb efficiency at 25 °C. The discharge specific capacity retention rate of this battery is 94.4% after 100 cycles at 0.2C. All these features make the gel polymer electrolyte useful as a separator of lithium metal batteries for high-performance lithium ion conductors, which exhibits high safety.

Published
2020

18. One-pot synthesis of 5,6-disubstituted 3H-pyrrolizines organocatalyzed by piperidinium acetate

Author

Li Yujiao, Wang Long, Kaibo Zheng, Jiaying Yan, Nuonuo Zhang, Kong Shuai, and Kai Cheng

Subjects
Indole test, 010405 organic chemistry, One-pot synthesis, General Chemistry, 010402 general chemistry, Ring (chemistry), 01 natural sciences, Toluene, Medicinal chemistry, 0104 chemical sciences, Catalysis, chemistry.chemical_compound, chemistry, Halogen, Organic chemistry, Methanol, Dichloromethane
Abstract

The organocatalyst, piperidinium acetate formed in situ, was utilized as an efficient catalyst for one-pot synthesis of 5,6-disubstituted 3H-pyrrolizines with halogen (Cl, Br), methoxy and ethyl ester groups. Absorption and emission spectra properties were also compared in dichloromethane, toluene, methanol, and DMSO. Electronic spectra were altered slightly by these substituents, which can be well explained by TD-DFT calculations. And the selected four orbital energies indicated that electrons transited smoothly from the pyrrolizine ring to the indole unit.

Published
2017

19. Synthesis and photoelectric property of N-confused porphyrins bearing an ethynylbenzoic and benzoic acid moiety

Author

Jiaqi Chen, Dejiang Li, Kai Cheng, Li Yujiao, Nuonuo Zhang, Long Wang, Kaibo Zheng, Jiaying Yan, and Yang Qingqing

Subjects
010405 organic chemistry, Chemistry, chemistry.chemical_element, General Chemistry, Photoelectric effect, 010402 general chemistry, Electrochemistry, 01 natural sciences, Quantum chemistry, 0104 chemical sciences, Hydrolysis, chemistry.chemical_compound, Polymer chemistry, Mass spectrum, Organic chemistry, Moiety, Benzoic acid, Palladium
Abstract

Two novel π-enlarged palladium N-confused porphyrins (Pd-NCPs) containing benzoic acid or 4-ethynylbenzoic acid moiety were synthesized by dibromination, silver metallation, Pd-catalyzed cross-coupling, and hydrolysis reaction. All compounds were characterized by 1H-NMR and mass spectra. Optical and electrochemical properties were also obtained. The photovoltaic properties of these π-enlarged Pd-NCPs were examined and the sensitizers achieved low efficiency, which was well explained by quantum chemistry calculation.

Published
2016

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