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Research on cathode material of Li-ion battery by yttrium doping

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Journal of Rare Earths 2008年第2期26卷 279-283页

作者：田彦文康晓雪刘丽英徐茶青曲涛 School of Materials and Metallurgy Northeastern University Faculty of Materials and energy Guangdong University of Technology

Modification of LiFePO4, LiMn2O4 and Li1＋xV3O8 by doping yttrium was investigated. The influences of doping Y on structure, morphology and electrochemical performance of cathode materials were investigated systematically. The results indicated that the mechanisms of Y doping in three cathode materials were different, so the influences on the material performance were different. The crystal structure of the three materials was not changed by Y doping. However, the crystal parameters were influenced. The crystal parameters of LiMn2O4 became smaller, and the interlayer distance of （100） crystal plane of Li1-xV3O8 was lengthened after Y doping. The grain size of Y-doped LiFePO4 became smaller and grain morphology became more regular than that of undoped LiFePO4. It indicated that Y doping had no influence on crystal particle and morphology of LiMn2O4. The morphology of Li1＋xV3O8 became irregular and its size became larger with the increase of Y. For LiFePOaand Li1＋xV3O8, both the initial discharge capacities and the cyclic performance were improved by Y doping. For LiMn2O4, the cyclic performance became better and the initial discharge capacities declined with increasing Y doping.

关键词： yttrium cathode material Li-ion battery doping conductivity discharge capacity rare earths

Growth of Aligned Carbon Nanotubes on Large Scale by Methane Decomposition with Deactivation Inhibitor

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Journal of Natural Gas Chemistry 2007年第4期16卷 382-388页

作者： Hao Yu Zhili Li Cheng Zhang Feng Peng Hongjuan Wang School of Chemical and energy Engineering South China University of Technology Guangzhou 510650 Guangdong China

The effects of additives containing iron or nickel during chemical vapor deposition （CVD） on the growth of carbon nanotubes （CNTs） by methane decomposition on Mo/MgO catalyst were investigated. Ferrocene and nickel nitrate were introduced as deactivation inhibitors by in-situ evaporation during CVD. The precisely controlled in-situ introduction of these inhibitors increased the surface renewal of catalyst, and therefore prevented the catalyst from deactivation. Using this method, aligned multi-walled CNTs with parallel mesopores can be produced on a large scale.

关键词： aligned carbon nanotubes chemical vapor deposition deactivation inhibitor methane decomposition Mo/MgO catalyst ferrocene nickel nitrate

Effects of Ultrasonic Treatment on Microstructure and Mechanical Properties of Semisolid Sn-52Bi Alloy

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Journal of Wuhan University of technology(Materials Science) 2016年第5期31卷 1063-1067页

作者：胡永俊郑辉庭 School of Material and energy Guangdong University of Technology Guangzhou 510006 China

The effects of ultrasonic vibration temperature on the microstructure of semisolid Sn-52 Bi alloy and mechanical properties were investigated. The results show that the microstructure and mechanical properties are improved obviously after the ultrasonic treatment. Nearly round and uniformly distributed primary Sn phase particles were obtained under the cavitation and acoustic streaming caused by ultrasonic treatment. The best effects of ultrasonic treatment on microstructure and mechanical properties were obtained with the ultrasonic vibration for 120 s at 140 ℃. The elongation of semisolid Sn-52 Bi alloy treated by ultrasonic vibration for 120 s at 140 ℃ was 42% and increased by 156.09% compared to conventional liquid casting Sn-52 Bi alloy without ultrasonic vibration. It is a feasible and effective method to adopt the semisolid metal forming technology assisted with ultrasonic vibration to improve the ductility of Sn-Bi alloys.

关键词： semisolid Sn-52Bi ultrasonic treatment microstructure mechanical properties

Natural Lignin:A Sustainable and Cost-Effective Electrode Material for High-Temperature Na-Ion Battery

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energy & Environmental Materials 2024年第2期7卷 1-8页

作者： Yuqi She Xiwei Li Yanqin Zheng Dong Chen Xianhong Rui Xuliang Lin Yanlin Qin School of Chemical Engineering and Light Industry Guangdong Provincial Key Laboratory of Plant Resources BiorefineryGuangdong University of TechnologyGuangzhou 510006China School of Materials and energy Guangdong University of TechnologyGuangzhou 510006China

Rechargeable sodium-ion batteries usually suffer from accelerated electrode destruction at high temperatures and high synthesis costs of electrode ***,it is highly desirable to explore novel organic electrodes considering their cost-effectiveness and large adaptability to volume ***,natural biomass,pristine lignin,is employed as the sodium-ion battery anodes,and their sodium storage performance is investigated at room temperature and 60℃.The lignin anodes exhibit excellent high-temperature sodium-ion battery *** mainly results from the generation of abundant reactive sites(C=O)due to the high temperature-induced homogeneous cleavage of the C_(β)-O bond in the lignin *** work can inspire researchers to explore other natural organic materials for large-scale applications and high-value utilization in advanced energy storage devices.

关键词： high-temperature performance lignin Na storage mechanism organic anode sodium-ion battery

Multifunctional phase change composites based on biomass/MXenederived hybrid scaffolds for excellent electromagnetic interference shielding and superior solar/electro-thermal energy storage

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Nano Research 2022年第9期15卷 8524-8535页

作者： Yan Cao Ziheng Zeng Danyuan Huang Ying Chen Li Zhang Xinxin Sheng Department of Polymeric Materials and Engineering School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China guangdong Provincial Key Laboratory of Functional Soft Condensed Matter Guangdong University of TechnologyGuangzhou 510006China

With the rapid development of new generations of miniaturized,integrated,and high-power electronic devices,it is particularly important to develop advanced composite materials with efficient thermal management capability and excellent electromagnetic interference(EMI)shielding ***,an innovative biomass/MXene-derived conductive hybrid scaffold,cellulose nanocrystal(CNC)-konjac glucomannan(KGM)/MXene(CKM),was prepared by freeze-drying and thermal annealing,and then paraffin wax(PW)was encapsulated in CKM using vacuum impregnation method to obtain CNC-KGM/MXene@PW phase change composites(CKMPCCs).The results show that the obtained CKMPCCs possess considerable reusable stabilities,excellent EMI shielding properties,and thermal energy management *** them,the CKMPCC-6 with 2.3 wt.%MXene exhibits excellent solar-thermal and electro-thermal conversion *** addition,the EMI shielding effectiveness value is as high as 45.0 dB at 8.2–12.4 GHz and the corresponding melting enthalpy value is 215.7 J/g(relative enthalpy efficiency of 99.9%).In conclusion,the synthesized multifunctional phase change composites provide great potential for integrating outstanding EMI shielding and advanced thermal energy management applications.

关键词： MXene electromagnetic interference shielding phase change composites thermal energy management

Ionic bombardment of stainless steel by nitrogen and nickel ions immersion

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中国有色金属学会会刊：英文版 2008年第2期18卷 274-277页

作者：熊玲胡永俊徐建蒙继龙 College of Materials Science and Engineering South China University of Technology Faculty of Materials and energy Guangdong University of Technology

A new nitriding process was used to carry out the ionic bombardment,in which nickel ion was *** microstructure,composition and properties of the treated stainless steel were studied by means of scanning electron microscopy(SEM),micro-hardness test and electrochemistry *** results show that the hardness of the stainless steel is greatly increased after ionic bombardment under nitrogen and nickel ions ***’hardness as high as Hv1268 is *** bombarded stainless steel is of a little reduction in corrosion resistance,as compared with the original stainless steel. However,as compared with the traditional ion-nitriding stainless steel,the corrosion resistance is greatly improved.

关键词：不锈钢氮镍离子涂层合金

Flexible thermoregulatory microcapsule/polyurethane-MXene composite films with multiple thermal management functionalities and excellent EMI shielding performance

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Journal of Materials Science & technology 2023年第34期165卷 27-38页

作者： Danyuan Huang Ying Chen Li Zhang Xinxin Sheng Department of Polymeric Materials and Engineering School of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China guangdong Provincial Key Laboratory of Functional Soft Condensed Matter Guangdong University of TechnologyGuangzhou510006China

The development of miniaturized,flexible,and portable electronic devices has led to an increasing demand for multifunctional flexible films that can provide temperature regulation,electromagnetic interference(EMI)shielding,and thermal *** this study,a novel hierarchical multifunctional flexible composite film is *** first step involves the synthesis of phase change microcapsule(PCMC)latex through in-situ ***,PCMC and waterborne polyurethane(WPU)latex were mixed and dried using a binary colloidal approach to produce a flexible composite phase change film(WPU/PCMC)with complete anti-leakage and satisfying melting enthalpy(147.86 J g^(-1)).To enhance the EMI performance and mechanical strength,a thin layer of antioxidant MXene@poly tannin acid(PTA)was directly sprayed onto the surface of WPU/PCMC,resulting in the WPU/PCMC/MXene@PTA film(WPM).Consequently,the WPM displays exceptional thermal management performance for multiple drives and outstanding EMI performance(56.86 dB),making it an ideal candidate for future multifunctional products.

关键词： Flexibility,Microcapsules Composite film Thermal management EMI shielding

Effect of LiTFSI and LiFSI on Cycling Performance of Lithium Metal Batteries Using Thermoplastic Polyurethane/Halloysite Nanotubes Solid Electrolyte

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Acta Metallurgica Sinica(English Letters) 2021年第3期34卷 359-372页

作者： Zhichuan Shen Jiawei Zhong Wenhao Xle Jinbiao Chen Xi Ke Jianmin Ma Zhicong Shi School of Materials and energy Guangdong University of TechnologyGuangzhou 510006China guangdong Engineering technology Research Center for New energy Materials and Devices Guangzhou 510006China School of Physics and Electronics Hunan UniversityChangsha 410082China

All-solid-state lithium batteries(ASSLB) are promising candidates for next-generation energy storage ***,the large-scale commercial application of high energy density AS S LB with the polymer electrolyte still faces *** this study,a thin solid polymer composite electrolyte(SPCE) is prepared through a facile and cost-effective strategy with an infiltration of thermoplastic polyurethane(TPU),lithium salt(LiTFSI or LiFSI),and halloysite nanotubes(HNTs) in a porous framework of polyethylene separator(PE)(TPU-HNTs-LiTFSI-PE or TPU-HNTs-LiFSI-PE).The composition,electrochemical performance,and especially the effect of anions(TFSI-and FSI-) on cycling performance are *** results reveal that the flexible TPU-HNTs-LiTFSI-PE and TPU-HNTs-LiFSI-PE with a thickness of 34 μm exhibit wide electrochemical windows of 4.9 and 5.1 V(***+/Li) at 60℃,*** in FSI-tends to form more LiF and sulfur compounds at the interface between TPU-HNTs-LiFSI-PE and Li metal anode,thus enhancing the interfacial *** a result,cell composed of TPU-HNTs-LiFSI-PE exhibits a smaller increase in interfacial resistance of solid electrolyte interphase(SEI) with a distinct decrease in charge-transfer resistance during ***|Li symmetric cell with TPU-HNTs-LiFSI-PE could keep its stable overpotential profile for nearly 1300 h with a low hysteresis of approximately39 mV at a current density of 0.1 mA cm-2,while a sudden voltage rise with internal cell impedance-surge signals was observed within 600 h for cell composed of *** initial capacities of NCMITPU-HNTs-LiTFSIPEILi and NCMITPU-HNTs-LiFSI-PEILi cells were 149 and 114 mAh g-1,with capacity retention rates of 83.52% and89.99% after 300 cycles at 0.5 C,*** study provides a valuable guideline for designing flexible SPCE,which shows great application prospect in the practice of ASSLB.

关键词： Solid polymer composite electrolyte Lithium metal anode Thermoplastic polyurethane Halloysite nanotubes Cycling performance

High-temperature oxidation behavior and analysis of impedance spectroscopy of 7YSZ thermal barrier coating prepared by plasma spray-physical vapor deposition

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Chinese Journal of Aeronautics 2018年第8期31卷 1764-1773页

作者： Wenlong CHEN Min LIU Jifu ZHANG Ziqian DENG Jie MAO School of Materials and energy Guangdong University of Technology Guangzhou 510006 China National Engineering Laboratory for Modern Materials Surface Engineering technology & the Key Lab of guangdong for Modern Surface Engineering technology Guangdong Institute of New Materials Guangzhou 510650 China

Quasi-columnar structure 7YSZ（yttria stabilized zirconia） thermal barrier coatings（TBCs） are prepared by plasma spray-physical vapor deposition（PS-PVD） onto pretreated and un-pretreated bond coating, respectively. An isothermal oxidation experiment of 7YSZ TBCs is carried out in the atmosphere of 950 °C in order to simulate the high-temperature oxidation process of engine blades. The isothermal oxidation process of 7YSZ thermal barrier coatings is investigated systematically by impedance spectroscopy. The electrochemical physical model and equivalent circuit of columnar 7YSZ coatings are established. Results show that the isothermal oxidation kinetic curve of columnar 7YSZ thermal barrier coatings appears to follow the parabolic law. A pretreatment of bond coating can reduce the growth rate of the thermally grown oxide（TGO） layer, restraining the initiation and propagation of microcracks between YSZ and TGO layers. The oxidation rate constants of 7YSZ coatings with pretreated and un-pretreated bond coating are 0.101×10^（-12） cm^2·s^（-1） and 0.115 × 10^（-13） cm^2 ·s^（-1）, respectively. Impedance analysis shows that the content of oxygen vacancies decreases and the density increases after the TGO layer is oxidized for 150 h. In addition, shrinkage microcracks formed by sintering during the oxidation process is the main reason for an increase of the capacitance and a decrease of the resistance in the grain boundary of YSZ.

关键词： Bond coating Impedance spectroscopyIsothermal oxidation PS-PVD TBCs