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199 results on '"Ji, Xiaoxu"'

16. Magnetic Properties of Topological Material Candidate EuZnBi2.

Author

He, Junbao, Liu, Bo, Ma, Shishi, Jin, Sujuan, Zheng, Changbo, Fu, Yu, Zhu, Wenliang, Cheng, Jinbing, Liu, Congbin, Li, Liang, Ji, Xiaoxu, Luo, Yongsong, and Shi, Hao

Subjects
MAGNETIC properties, MAGNETIC anomalies, TOPOLOGICAL property, NUCLEAR spin, MAGNETIC susceptibility, ANTIFERROMAGNETIC materials, ATOMS
Abstract

The single crystals of the topological material candidate EuZnBi 2 have been grown using flux method, and the magnetic properties have been systematically investigated. Crystal structure analysis confirms that EuZnBi 2 crystallizes in a layered tetragonal structure at room temperature, consisting of alternating ZnBi 4 tetrahedral and Bi planar layers, separated by Eu atoms. The direct current (DC) magnetic susceptibility, alternating current (AC) magnetic susceptibility, and specific heat measurements indicate that a long-range antiferromagnetic order of Eu 2 + develops at T N = 20 K and the magnetic easy axis exists in the layers. It is interesting to note that EuZnBi 2 exhibits a magnetic anomaly below T N , which might be associated with the tilting of Eu moments and spin reorientation. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Ionic liquid-assisted synthesis of hierarchical Ti2Nb10O29 porous microspheres coated by ultrathin N-doped carbon layers for high-performance lithium-ion battery

Author

Ruoyu Liu, Guangyin Liu, Ji Xiaoxu, Xiaodi Liu, Jianmin Ma, Yuezhan Feng, and Chen Hao

Subjects
010302 applied physics, Materials science, Vapor pressure, Process Chemistry and Technology, chemistry.chemical_element, Nanoparticle, 02 engineering and technology, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, Lithium-ion battery, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Anode, chemistry.chemical_compound, chemistry, Chemical engineering, 0103 physical sciences, Ionic liquid, Materials Chemistry, Ceramics and Composites, 0210 nano-technology, Dicyanamide, Carbon
Abstract

Nanoparticle-assembled Ti2Nb10O29 porous microspheres coated by N-doped carbon layers (TNO@N–C-M) have been synthesized using ionic liquid 1-ethyl-3-methylimidazolium dicyanamide ([Emim]DCA) as carbon and nitrogen sources. Owing to the wide liquid range, low vapor pressure, and low surface tension of [Emim]DCA, the as-obtained N-doped carbon layers possess ultrathin thickness (~3 nm) and the primary TNO nanoparticles have ultrasmall sizes (20–30 nm). The synergistic effects from the particular structure lead to high electronic conductivity, fast ion/electron transport kinetics, and increscent pseudocapacitive contribution. Accordingly, the TNO@N–C-M anode has large discharge capacity (309.6, 262.2, 240.6, 216.5 and 204.5 mA h g−1 at 1, 5, 10, 20, and 30 C, respectively), good rate capacity (304.9 and 208.1 mA h g−1 at 1 and 30 C, respectively), and superior cycle stability (219.5 mA h g−1 after 500 cycles at 10 C). Also, the LiNi0.5Mn0.3Co0.2O2//TNO@N–C-M full cell also exhibits superior electrochemical properties with promising application prospect.

Published
2021

40. Carbon-Coated SnO2 Nanorod Array for Lithium-Ion Battery Anode Material

Author

Ji Xiaoxu, Huang Xintang, Liu Jinping, Jiang Jian, Li Xin, Ding Ruimin, Hu Yingying, Wu Fei, and Li Qiang

Subjects
Carbon-coated SnO2 nanorod array, Hydrothermal method, LIBs, Anode material, Array architecture, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Abstract Carbon-coated SnO2 nanorod array directly grown on the substrate has been prepared by a two-step hydrothermal method for anode material of lithium-ion batteries (LIBs). The structural, morphological and electrochemical properties were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical measurement. When used as anodes for LIBs with high current density, as-obtained array reveals excellent cycling stability and rate capability. This straightforward approach can be extended to the synthesis of other carbon-coated metal oxides for application of LIBs.

Published
2010
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