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Influences of ti substitution on the structure and electrochemical properties of Mg_(1-x)ti_xNi(x=0,0.1, 0.2, and 0.3) hydrogen storage alloys

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Rare Metals 2009年第5期28卷 504-510页

作者： HUANG Hongxia HUANG Kelong LIU Suqin CHEN Dongyang College of Chemistry and Chemical Engineering Central South University Changsha 410083 China Department of Materials and Chemical Engineering Guilin University of Technology Guilin 541004 China

MgNi-based hydrogen storage alloys Mg1–xtixNi （x = 0, 0.1, 0.2, and 0.3） were prepared by means of mechanical alloying. Mg in the alloy was partially substituted by ti to improve the cycle stability of the alloys. The effects of the substitution of ti for Mg on the microstructure and electrochemical performances of the alloys were investigated in detail. The results indicate that the substitution of ti for Mg obviously decreases the discharge capacity, but it significantly improves their cycle stabilities. The microstructure of the alloys analyzed by X-ray diffraction （XRD） and scanning electron microscopy （SEM） shows that the alloys have a dominatingly amorphous structure. The substitution of ti for Mg helps to improve the anti-oxidation/corrosion ability of the MgNi alloy but demolishes the electrochemical kinetics of hydrogenation/dehydrogenation. The Mg0.9ti0.1Ni alloy electrode milled for 80 h exhibits the best integrative capability, which has the maximal discharge capacity of 331.66 mAh/g and the C30/Cmax of 63.65%.

关键词： hydrogen storage alloys ti substitution structural characteristic electrochemical properties

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Effect of ti substitution on hydrogen storage properties of Zr_(1-x)ti_xCo (x = 0, 0.1, 0.2, 0.3) alloys

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Journal of Energy Chemistry 2014年第1期23卷 9-14页

作者： Yamin Zhao Rongfeng Li Ruihe Tang Boyan Li Ronghai Yu Wei Liu Huaqin Kou Jianbo Meng School of Materials Science and Engineering Beihang University Department of Materials Science and Engineering Tsinghua University China Academy of Engineering Physics

Zr1-xtixCo(x = 0, 0.1, 0.2, 0.3) alloys were prepared by arc-melting method and the effect of ti substitution on hydrogen storage properties was studied systematically. Hydrogen desorption pressure-composition-temperature(PCT) measurements were carried out using Sievert’s type volumetric apparatus for ZrCo(at 473 K, 573 K and 673 K) and Zr1-xtixCo alloys(at 673 K), respectively. Products after dehydrogenation were characterized by X-ray diffraction(XRD). In addition, the kinetics of Zr1-xtixCo hydride was investigated at 473 K and 673 K,respectively, under hydrogen pressure of 5 MPa. Results showed that ti substitution for Zr did not change the crystal structure of ZrCo *** the increase of temperature from 473 K to 673 K, the extent of disproportionation for ZrCo alloy increased. With ti content increasing at 673 K, the desorption equilibrium pressure of Zr1-xtixCo-H2 systems elevated and the disproportionation reaction of Zr1-xtixCo alloys was inhibited effectively. ti substitution decreased the kinetics rate and the effective hydrogen storage capacity of Zr1-xtixCo alloys *** speaking, it was found that Zr0.8ti0.2Co alloy had better anti-disproportionation property with less decrease of effective hydrogen storage capacity which was beneficial to tritium application in the International Thermonuclear Experimental Reactor(ITER).

关键词： ZrCo-based alloys ti substitution hydrogen storage properties anti-disproportionation

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Fibonacci Stoichiometry and Superb Performance of Nb₁₆W₅O₅₅ and Related Super-Battery Materials

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Journal of Applied Mathematics and Physics 2022年第6期10卷 1936-1950页

作者： Hans Hermann Otto Materialwissenschaftliche Kristallographie Clausthal University of Technology Clausthal-Zellerfeld Lower Saxony Germany

In this contribution, two important crystallographic concepts for the formation of a series of block structures associated with channeling have been compared: chemical twinning and crystallographic shear. Twin planes respectively shear planes besides formed channels serve as a sink for charge carriers or, when the oxidation state of metal ions can be reduced, as a reservoir for intercalated lithium. In this way, Wadsley-Roth shear phases such as niobium tungsten oxide exhibit channels for ultra-fast lithium-ion diffusion. They are in focus as anode material for super-batteries, superb in terms of energy respectively power density, charging time, cycle life and safety. It should be noted that the transition metal to oxygen ratio TM/O = 21/55 of the title compound is a Fibonacci number quotient. Also, the crystal lattice can be traced back to Fibonacci geometry. When replacing only 0.0213 tungsten atoms in the formula with less expensive titanium, a TM/O ratio of 0.381966 =ϕ2 can be adapted besides an average valence electron concentration of 2⋅ϕ-2, where represents the most irrational number of the golden mean. The additional disorder caused by even such small titanium replacement and accompanied oxygen vacancies could fasten up the already high lithium diffusion further. Ultrasonic treatment may be applied besides thermal cycling to prepare phase-pure of the highest electrochemical performance. A replacement of oxygen by some fluorine atoms is an obvious synthesis possibility, but the higher binding energy expected between lithium and fluorine in contrast to oxygen may rather hinder than promote lithium diffusion.

关键词： Super Battery Niobium Tungsten Oxide Crystallographic Shear Chemical Twinning Fibonacci Stoichiometry ti substitution

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