赖琼钰
无机非金属材料、无机功能材料
个性化签名
- 姓名:赖琼钰
- 目前身份:
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学术头衔:
博士生导师
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学科领域:
肿瘤学
- 研究兴趣:无机非金属材料、无机功能材料
赖琼钰,女,教授、博导,1968年毕业于四川大学化学系,现为四川大学化学学院无机教研室主任,四川省化学化工学会无机专委会副主任,《无机化学学报》杂志编委。主要研究方向为:无机非金属材料、无机功能材料。主要讲授课程有:无机化学、无机固体化学、无机非金属材料化学、无机功能材料化学、无机材料设计与合成化学等。
近年来,作为课题负责人承担并完成国家自然科学基金项目、教育部博士点基金资助项目、四川省科技攻关项目、四川省应用研究基础项目等多项,已在国内外刊物上发表文章70多篇,参编著作4部,多篇论文在国际及国内会议上进行交流及多次在交流会上作口头报告。除了在基础理论方面的研究外,对应用方面也进行了很多工作,用软化学法合成层状锂离子电池用正极材料新工艺已通过四川省科技厅鉴定,该生产技术已通过学校进行转让。
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496
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成果数
12
【期刊论文】Synthesis and electrochemical characteristics of Li-Ni vanadates as positive materials
赖琼钰, Qiong Yu Lai a, *, Ji Zheng Lu a, Xing Long Liang a, Fang Yong Yan a, Xian Yang Ji b
International Journal of Inorganic Materials 3(2001)381-385,-0001,():
-1年11月30日
An electrochemically active lithium–nickel vanadate phase of LiNiVO containing VO tetrahedrons has been synthesized by soft chemical method through a new mild liquid route at 450℃ for 3h in air. The products were characterized by X-ray diffraction, thermal analysis, SEM, IR and Raman spectra, respectively. The cells using lithium-nickel vanadate as a cathode can be cycled between 4.8 and 3.0V (vs. Li) at current density of 0.2mA/cm2. The results indicated that the low-temperature specimen prepared by liquid route exhibited better electrochemical properties than the high-temperature specimen obtained by solid-state reaction.
Lithium-Nickel vanadate, Inverse spinel, Synthesize, Complex-precipitate-gel method, Cathode material, Electrochemical characteristics
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【期刊论文】Synthesis and Electrochemical Studies of Spinel LiNi1-xMnxVO4
赖琼钰, Qiong Yu Lai, *, , Ji Zheng Lu, Xiao Bo Su, * and Xiao Yang Ji†
Journal of Solid State Chemistry 165, 312-316 (2002),-0001,():
-1年11月30日
Spinel compound LiNi1-xMnxVO4 (0≤x≤0.4) had been prepared by using the moist chemical method. X-ray di4raction spectra showed that the lattice constant increased with x in the LiNi1-xMnxVO4, XPS spectra indicating that Li1s had a chemical shift towards lesser binding energy, and manganese in LiNi1-xMnxVO4 existing as the mixed valence of Mn2+ and Mn3+. The electrochemical charge and discharge testing at a current density of 0.1mA/cm2 between the potentialsof 4.0 and 3.0V vs Li/Li+ in 1mol/dm3 LiPF6/EC+DEC (1:1 by volume) at 25℃ showed that LiNi1-xMnxVO4 cell hasa better rechargeability, but a lower cell voltage of 4.0V vsLi/Li+ than that without the doping sample, and the capacity and the cycle efficiency of the Li/LiNi1-xMnxVO4 cellsincreas ed with x in the LiNi1-xMnxVO4.
lithium-nickel-manganese-vanadate, inverse spinel, substitution, moist chemical method, synthesis, electrochemical characteristic.,
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【期刊论文】Study of preparation and properties on magnetization and stability for ferromagnetic fluids
赖琼钰, Lai Qiong Yu a, *, Lu Ji Zheng a, Ji Xiao Yang b
Materials Chemistry and Physics 66(2000)6-9,-0001,():
-1年11月30日
This paper shows that Fe(OH)2 precipitates were partially oxidized byH2O2 to ultrafine Fe3O4 powders about 8-10nm in the presence of surfactants. The magnetic fluid with various concentrations were prepared by using water and oil as carrier liquids, respectively. The phase analysis, morphology, ultrafine powder sizes and magnetic properties were measured by XRD, IR, TEMand vibrating sample magnetometer (VSM), respectively. The stability of the magnetic fluids were evaluated by testing the suspension percent. The influence of the amount of surfactants and the initial concentration of magnetic fluids on stability of the magnetic fluids was examined. The magnetization versus the concentration of magnetic fluids and carriers is also discussed.
Ultrafine Fe3O4, Magnetic fluids
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赖琼钰, 刘东强, 赖琼钰*, , 郝艳静, 卢集政, 吉晓洋
无机化学学报,2004,20(7):829~832,-0001,():
-1年11月30日
The precursors of Li4Ti5O12 were prepared from tetrabutyl titanate and lithium acetate by sol-gel process. The Li4Ti5O12 samples were synthesized by calcining the gel precursors at 400~900℃ in air for 6~20h. Its reaction mechanism was investigated by infrared speetroseopy(IR), thermogravimetry(TG) and X-ray diffraetion(XRD). The effects of sinter-temperature, calcination-time and thermal-treatment for the products were discussed. The samples were characterized by X-ray diffraetion(XRD), scanning electron mieroseopy(SEM). The results showed that the single-phase products were obtained by calcining the gel precursors at 800℃ in air for 20h, the sintertemperature was lower than that of solid-state method, the particles were narrowly distributed, well crystallized with a size range from 0.3μm to 0.5μm.
溶胶-凝胶法 Li4Ti5O12 合成 机理
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赖琼钰, Yanjing Hao, Qiongyu Lai*, Zhihui Xu, Xueqi Liu, Xiaoyang Ji
Solid State Ionics 176(2005)1201-1206,-0001,():
-1年11月30日
Anode material Li4Ti5O12 for lithium-ion batteries have been synthesized by a novel sol-gel method with triethanolamine(TEA) as a chelating agent and LiAcd 2H2O and Tetrabutyl titanate [Ti(OC4H9)4] as starting materials. Various initial conditions were studied in order to find the optimal conditions for the synthesis of Li4Ti5O12. The as-prepared samples have been characterized by means of XRD, IR and SEM. Its electrochemical behavior was evaluated in a liquid electrolyte in lithium-ion batteries. These analyses indicated that the prepared Li-Ti-O powders belonged to a spinel structure and had a uniform morphology with average particle size from 223 to 105nm with the increase in TEA content. At 1.55V (vs. Li), the Li4Ti5O12 electrode with the ratio of TEA to Ti ions 0.8 exhibited an initial discharge capacity of 168mA h/g and a subsequent charge capacity of 151mA h/g. The results of cyclic voltammetry for Li4Ti5O12 showed that at the potential range from 1.5 to 1.7V (vs. Li), there was a pair of reversible redox peaks correspond to the process of Li+ intercalation and deintercalation in the spinel Li-Ti-O oxides.
TEA, Sol-gel method, Li4Ti5O12, Anode material, Lithium-ion battery
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赖琼钰, Tong Dong-Ge a, *, Lai Qiong-Yu a, Wei Ni-Ni a, Tang Ai-Dong b, Tang Lian-Xing b, Huang Ke-Long b, Ji Xiao-Yang a
Materials Chemistry and Physics 94(2005)423-428,-0001,():
-1年11月30日
Layered LiCo1/3Ni1/3Mn1/3O2 was synthesized by a newly developed water-in-oil emulsion method. The synthesis process of LiCo1/3Ni1/3Mn1/3O2 was investigated by TG/DTA, FTIR and XRD. Li2CO3, NiO, CoO and Mn2O3 are the intermediate products. With the calcination temperature increasing, Li2CO3 undergoes direct reactions with NiO, CoO and Mn2O3 to form LiCo1/3Ni1/3Mn1/3O2. The kinetics of formation of LiCo1/3Ni1/3Mn1/3O2 by the water-in-oil emulsion method is faster than the case of the conventional solid-state reaction between lithium carbonate and corresponding reactants. The single phase of LiCo1/3Ni1/3Mn1/3O2 was obtained at 650℃. Itwas found that the submicro-sized LiCo1/3Ni1/3Mn1/3O2 synthesized at 850℃ for 4h in oxygen atmosphere presents the best electrochemical performance, which delivers an initial discharge capacity of 157mAh g-1 in the cut-off voltage of 2.7-4.2V, and exhibits good cycle performance.
LiCo1/, 3Ni1/, 3Mn1/, 3O2, Cathode material, Lithium ion battery, Water-in-oil emulsion method
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赖琼钰, 张花蓉, 赖琼钰*, 卢集政, 吉晓洋
无机化学学报,2003,19(11):1241~1244,-0001,():
-1年11月30日
LiNiO2 was prepared by reaction of stoichiometric amounts of thoroughly-mixed LiOH•H2O and preoxidation nanometer-scale Ni3O2(OH)4 powders in O2 at the temperature of 700℃ for 6h. The products were tested by XRD, XPS, SEM and electrochemistry methods. It was shown that product was LiNiO2 single-phase, and the valence of nickel was+3; the average size of it was 40nm; its initial charge specific capacity is 168mAh•g-1 and the coulomb efficiency is 90%; the second charge specific capacity is 160mAh•g-1 and the coulomb efficiency is 96%.
LiNiO2 预氧化 Ni3O2(, OH), 4 固气合成法 循环性能
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赖琼钰, 余鼎, 赖琼钰*, , 卢集政, 韦勇强, 吉晓洋, 杨争
无机化学学报,2003,19(5):552~556,-0001,():
-1年11月30日
The LiMn2O4 spinel was prepared by wet method using Li2CO3, Mn(CH3COO)2•4H2O and CO2 as raw materials. The products were measured by TG/DTA, XRD, IR. The results Showed that the sample calcined at 800℃ for 10h was well crystallized monophase product. The contents of Mn(Ⅲ) and Mn (Ⅳ) of LiMn2O4 spinel were determined simultaneously by spectrophotometric analysis with pyrophosphoric acid.
LiMn2O4尖晶石 湿法 光度法 锰测定
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赖琼钰, 韦勇强, 赖琼钰*, , 余鼎, 吉晓洋
无机化学学报,2003,19(4):411~414,-0001,():
-1年11月30日
The paper first reported the preparation of ultrafine Fe3O4 powder about 8~10nm by improved chemical precipitation method, then turned it into magnetic fluid. The phase analysis, morphology, ultrafine powder size and magnetic property were measured by XRD, TEM and vibrating sample magnetometer(VSM), respectively. In addition, a new method, by analyzed the suspending percentage of Fe3O4 powder, was introduced to study the effects of concentration, pH value, centrifugal rate and time on the stability of the magnetic fluid.
Fe3O4超细粉 磁液 悬浮率 稳定性分析
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赖琼钰, 刘雪奇, 曾红梅, 赖琼钰*, 韦勇强, 吉晓洋
无机化学学报,2005,21(4):490~494,-0001,():
-1年11月30日
在共沉淀法合成超细磁粉的基础上,以苯乙烯(St)和丙烯酸为共聚单体,以过氧化苯甲酰(BPO为引发剂,用分散聚合法得到了含羧基的具有核壳结构的磁性高分子微球。采用XRD、TEM、SEM、IR等对样品进行了表征。表征结果表明:制备的磁粉为Fe3O4单相,磁粉的粒径为10nm左右,微球粒径大约在1~5μm,呈球形,微球中存在羧基。VSM磁性能测试结果表明:用PEG4000作为表面活性剂时。样品的磁性能最强。分散剂和分散介质对微球形貌和粒度均有影响。
磁粉, 磁性高分子微球, 分散聚合法, 磁性能
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