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Novel porous starfish-like Co3O4@nitrogen-doped carbon as an advanced anode for lithium-ion batteries

Nano Research 2017年第10期10卷 3457-3467页

作者： Yan Sun Fangzhi Huang Shikuo Li Yuhua Shen Anjian Xie School of Chemistry and Chemical Engineering Lab for Clean Energy & Green Catalysis Anhui University Hefei 230601 China

A Co-based metal-organic framework （Co-MOF） with a unique three-dimensional starfish-like nanostructure was successfully synthesized using a simple ultrasonic method. After subsequent carbonization and oxidation, a nanocomposite of nitrogen-doped carbon with a Co3O4 coating （Co3O4@N-C） with a porous starfish-like nanostructure was obtained. The final hybrid exhibited excellent lithium storage performance when evaluated as an anode material in a lithiumion battery. A remarkable and stable discharge capacity of 795 mAh·g^-1 was maintained at 0.5 A·g^-1 after 300 cycles. Excellent rate capability was also obtained. In addition, a full Co3O4@N-C/LiFePO4 battery displayed stable capacity retention of 95% after 100 cycles. This excellent lithium storage performance is attributed to the unique porous starfish-like structure, which effectively buffers the volume expansion that occurs during Li^＋ insertion/deinsertion. Meanwhile, the nitrogendoped carbon coating enhances the electrical conductivity and provides a buffer layer to accommodate the volume change and accelerate the formation of a stable solid electrolyte interface layer.

关键词： cobaltosic oxide starfish-like structure nitrogen-doped carbon metal-organic framework lithium-ion battery long cycle life

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Synthesis and characterization of Co_3O_4 prepared from atmospheric pressure acid leach liquors of nickel laterite ores

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International Journal of Minerals,Metallurgy and Materials 2018年第1期25卷 20-27页

作者： Long Meng Zhan-cheng Guo Jing-kui Qu Tao Qi Qiang Guo Gui-hua Hou Peng-yu Dong Xin-guo Xi National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Zhengzhou Institute of Emerging Technology Industries Zhengzhou 450000China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China Jiangsu Collaborative innovation Center for Ecological Building Materials and Environmental Protection Equipments Yancheng Institute of TechnologyYancheng 224051China

A chemical precipitation-thermal decomposition method was developed to synthesize Co3O4 nanoparticles using cobalt liquor obtained from the atmospheric pressure acid leaching process of nickel laterite ores. The effects of the precursor reaction temperature, the concentration of Co2＋, and the calcination temperature on the specific surface area, morphology, and the electrochemical behavior of the ob- tained Co304 particles were investigated. The precursor basic cobaltous carbonate and cobaltosic oxide products were characterized and ana- lyzed by Fourier transform infrared spectroscopy, thermogravimetric differential thermal analysis, X-ray diffraction, field-emission scanning electron microscopy, specific surface area analysis, and electrochemical analysis. The results indicate that the specific surface area of the Co3O4particles with a diameter of 30 rim, which were obtained under the optimum conditions of a precursor reaction temperature of 30℃, 0.25 mol/L Co2＋, and a calcination temperature of 350℃, was 48.89 m2/g. Electrodes fabricated using Co3O4 nanoparticles exhibited good electrochemical properties, with a specific capacitance of 216.3 F/g at a scan rate of 100 mV/s.

关键词： nickel laterite ores, acid leach liquors synthesis cobaltosic oxide characterization

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Preparation and capacitance properties of Ni foam@graphene@Co_(3)O_(4)composite electrode materials

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Journal of Central South University 2022年第1期29卷 14-21页

作者： CHI Li-ping YUAN Meng FU Jie JIN Ya-zhou ZHAO Si-yu XU Fen WANG Shao-xu College of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028China College of Environmental and Chemical Engineering Dalian Jiaotong UniversityDalian 116028China Guangxi Key Laboratory of Information Materials(Guilin University of Electronic Technology) China

Graphene under high temperature was prepared and loaded on Ni ***,cobalt tetroxide precursor was grown on Ni foam in situ by the hydrothermal ***,the sample was burned at high temperature to obtain Co_(3)O_(4)+graphene@*** hydrothermal method used in this paper is easy to operate,with low-risk factors and environmental *** prepared Co_(3)O_(4)+graphene@Ni electrode exhibits superior electrochemical performance than Co_(3)O_(4)@Ni *** a current density of 1 A/g,the specific capacitance of the Co_(3)O_(4)+graphene@Ni electrode calculated by a charge-discharge test is 935 F/g,which is much larger than that of Co_(3)O_(4)@Ni electrode of 340 F/g.

关键词： hydrothermal method supercapacitor cobaltosic oxide graphene in-situ growth

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超级电容器用氧化钌（RuO2）基复合薄膜电极的制备与表征

超级电容器用氧化钌（RuO2）基复合薄膜电极的制备与表征

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作者：黄小清中南大学

学位级别：硕士

Electrochemical supercapacitor has been recognized as a new type of energy storage devices that fill the gap between batteries and conventional capacitors. Supercapacitors have many characteristics, such as high specific capacitance, high power density, short time of charge, long cycle life. RuO2, which is based on faraday charge-discharge(CD) principle, has been the key electrode material to make supercapacitors. However, the application of RuO2is limited due to its high cost. So, RuO2-based electrode materials have become the research focus today.In this thesis, we used sol-thermal decomposition, colloidal and combination(coating-thermal decomposition and electrodeposition) meth-ods to prepare RuO2-based silica, cobaltosic oxide, and polyaniline composite electrodes, respectively. The structure, morphology and electrochemical performances of these electrods were characterized by XRD, SEM, FT-IR, CHI660C and so on. Got the following main results:1. We prepared (RuO2/SiO2)-nH2O composite film electrode by sol-thermal decomposition method, also explored and optimized the preparation technology. If the molarity ratio of RuCl3·3H2O and TEOS was10:3, the film electrode got best property after sintered2h at35O℃. The results of adhesion testing was21.2MPa, respectively. The film electrode exhibited the best electrochemical property, when we chose H2SO4as electrolyte, its specific capacitance was421F/g, and the inner resistance was about0.49Ω;Besides, its CD curves were symmetrical, which symbolized its hgih CD efficiency.2. Using colloidal method to prepare (RuO2/Co3O4)·nH2O film electrode, we explored the influence which the molar ratio n(Co):n(Ru) of Co2+and Ru3+, sintering temperature and time affected on the film electrode's morphology, composition structure and property. Besides, we researched the film's electrochemical behaviour in acid, neutral and alkaline solution, when n(Co):n(Ru)=2:1, the film electrode prepared after sintered at350℃for2.5h exhibite

关键词： Ruthenium oxide silica cobaltosic oxide polyaniline specific capacitance

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