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Synthesis of NiFe2O4 Nanowires with NiO Nanosheet as Precursor via a Topochemical solid state method

Chemical Research in Chinese Universities 2015年第5期31卷 885-889页

作者： FENG Jing HOU Xiangyu CHEN Tingting LIU Shengna FAN Zhuangjun REN Yueming LU Yanzhuo Key Laboratory of Superlight Materials & Surface Technology Ministry of Education Harbin Engineering University Harbin 150001 P. R. China Institute of Seawater Desalination and Multipurpose Utilization State Oceanic Administration Tianjin 300192 P. R. China

Large scale NiFe2O4 nanowires were synthesized with NiO nanosheets as precursor by means of the topochemical solid state method. The morphologies and magnetic properties of NiFe2O4 annealed at different temperatures were studied. An appropriate annealing temperature was requested to transfer NiO nanosheets and Feions into NiFe2O4 nanowires. In the beginning stage of synthesizing process, the shape ofNiO nanosheets remained unchanged at low temperatures. And then, NiO nanosheets split into nanowires from 400 ℃ to 600 ℃. At last they transformed into nanoparticles from 700 ℃ to 1000 ℃. Thus, the optimized annealing temperature was selected as 600 ℃ because the NiFe2O4 obtained at 600 ℃（N600） exhibited a maximum aspect ratio of 50 with a diameter of 20 nm and a length of 1 μm. Furthermore, N600 also displayed the largest magnetization value of 26.86 A·m^2/kg and the lowest coercivity（Hc） of 8914 A/m.

关键词： Nanowire NiO NiFe2O4 solid state method Topochemical method

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Effects of different iron sources on the performance of LiFePO_4/C composite cathode materials

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Journal of University of Science and Technology Beijing 2008年第6期15卷 802-807页

作者： Fei Gao Zhiyuan Tang Jianjun Xue School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Great Power Battery Co. Ltd. Guangzhou 511483 China

Olivine LiFePO4/C composite cathode materials were synthesized by a solid state method in N2 ＋ 5vol% H2 atmosphere. The effects of different iron sources, including Fe（OH）3 and FeC2O4·2H2O, on the performance of as-synthesized cathode materials were investigated and the causes were also analyzed. The crystal structure, the morphology, and the electrochemical performance of the prepared samples were characterized by X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, laser particle-size distribution measurement, and other electrochemical techniques. The results demonstrate that the LiFePO4/C materials obtained from Fe（OH）3 at 800℃ and FeC2O4·2H2O at 700℃ have the similar electrochemical performances. The initial discharge capacities of LiFePO4/C synthesized from Fe（OH）3 and FeC2O4·2H2O are 134.5 mAh.g^-1 and 137.4 mAh.g^-1 at the C/5 rate, respectively. How- ever, the tap density of the LiFePO4/C materials obtained from Fe（OH）3 are higher, which is significant for the improvement of the capacity of the battery.

关键词： iron sources lithium iron phosphate cathode material solid state method

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Synthesis and electrochemical performance of TiO_2-B as anode material

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Journal of Central South University 2011年第2期18卷 406-410页

作者：王新宇谢科予李劼赖延清张治安刘业翔 School of Metallurgical Science and Engineering Central South University

TiO2-B was synthesized by solid-state reaction. The structures, surface morphologies and electrochemical performances of TiO2-B were characterized by X-ray diffractometry （XRD）, scanning electron microscopy （SEM） and electrochemical measurement, respectively. The effects of calcining temperature, molar ratio of K2O to TiO2 and calcining time on the characteristics of TiO2-B were investigated. The results show that the calcining time exerts a significant influence on the electrochemical performances of TiO2-B. The TiO2-B is obtained with good crystal structure and suitable size by using K2Ti4O9, which is prepared at 950 ℃for 24 h under the condition of x（K2O）/x（TiO2）=1：3.5. The TiO2-B delivers all initial discharge capacity of 231.6 mA.h/g. And the rate caoacitv is 73.2 mA-h/g at 1 675 mA/g, which suggests that TiO2-B is a promising anode material for the lithium ion batteries.

关键词： lithium ion battery TiO2-B solid state method anode material

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Preparation of Luminescent Tb^3＋ Doped CaO Green Phosphor

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Journal of Chemistry and Chemical Engineering 2011年第2期5卷 146-149页

作者： Renqing Wang New Energy Technology ＆ Application Research Center Jiangxi University of Finance ＆ Economics Nanchang Jiangxi 330013China

CaCO3 was chosen as main raw material and solid state method was used to prepare the sample. The precursor was directly sintered at 1100 ℃ with reducing atmosphere for 3 h to obtain new green CaO：Tb^3＋, Li^＋ Phosphors. The effects of the content of the doping ions Tb^3＋ on the luminescent properties have been studied. The structure, morphology and luminescent properties of the phosphors were characterized by XRD, SEM, UV and PL-PLE spectra respectively. The results showed that the CaO：Tb^3＋, Li^＋ was a single face-centered cubic crystals, the phosphor particle distributed uniformly. The phosphor has a strong absorptive capacity excited by 282 nm ultraviolet ray, and could emit the strong green light with the wavelength of 543 nm （^5D4→^7F5）. The CaO：Tb^3＋, Li^＋ is a new type of green fluorescent material.

关键词： Spectroscopy solid state method green phosphors

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