| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the cycle life of an alkaline battery using a hydrogen absorption alloy containing a rare earth element, Mg, Ni, Al, and Zr , and the intensity ratio I<SB>A</SB>/I<SB>B</SB>is not less than 0.1 where I<SB>A</SB>is maximum peak intensity appearing in a range of 2θ between 31° and 33°, and I<SB>B</SB>is maximum peak intensity appearing in a range of 2θ between 40° and 44° in X-ray diffraction measurment using Cu-Kα as an X-ray source by preventing the detrioration of the hydrogen absorption alloy caused by charging and discharging. <P>SOLUTION: The hydrogen absorption alloy used for the negative pole 2 of the alkaline battery contains at least a rare earth element and Mg, Ni, Al and Zr, and the I<SB>A</SB>/I<SB>B</SB>is not less than 0.1 where I<SB>A</SB>is the maximum peak intensity appeared in a range of 2θ between 31° and 33°, and I<SB>B</SB>is the maximum peak intensity of the 2θ between 40° and 44° in the X-ray diffraction measurement using Cu-Kα line as the X-ray source, and the molar ratio of Zr for the sum total of the rare earth and Zr is in a range of 0.002 to 0.02. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
