Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Hydrogneation and Electrochemical Characteristics of Gas-atomized Zr-based $AB_2$ Hydride for Ni-MH Secondary Battery

기체분무형 공정으로 제조된 Zr계 금속수소화물의 수소화반응 및 Ni-MH 2차전지 전극 특성에 관한 연구

  • Kim, Jin-Ho (Korea Institute of Ceramic Engineering & Technology, Icheon Branch Institute) ;
  • Hwang, Kwang-Taek (Korea Institute of Ceramic Engineering & Technology, Icheon Branch Institute) ;
  • Kim, Byung-Kwan (Korea Energy Materials CO., LTD) ;
  • Han, Jeong-Seb (Dept. of Materials Science and Engineering, DongA Univ.)
  • Published : 2009.12.30
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Abstract

The hydriding and electrochemical characteristics of Zr-based $AB_2$ alloy produced by gas atomization have been extensively examined. For the particle morphology of the as-cast and gas-atomized powders, it can be seen that the mechanically crushed powders are irregular, while the atomized powder particles are spherical. The increase of jet pressure of gas atomization process results in the decrease of hydrogen storage capacity and the slope of plateau pressure significantly increases. TEM and EDS studies showed the increase of jet pressure in the atomization process accelerated the phase separation within grain of the gas-atomized alloy, which brought about a poor hydrogenation property. However, the gas-atomized $AB_2$ alloy powders produced by jet pressure of 50 bar kept up the reversible $H_2$ storage capacity and discharge capacity similar to the mechanically crushed particles. In addition, the electrode of gas-atomized Zr-based $AB_2$ alloy of 50 bar showed improved cyclic stability over that of the cast and crushed particulate, which is attributed to the restriction of crack propagation by grain boundary and dislocation with ch/discharging cycling.

Keywords

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