In order to improve the performance of AB2-type hydrogen-storage alloys for Ni-MH secondary battery, AB2-type alloys, ZrMn2Nix(x=0.0, 0.3, 0.6, 0.9 and 1.2) and ZrMnNi1+x(x=0.0, 0.1, 0.2, 0.3 and 0.4) were prepared as the Zr-Mn-Ni three component alloys. The hydrogen-storage and the electrochemical properties were investigated. The C14 Laves phase formed in all alloys of ZrMn2Nix(x=0.0∼1.2). The equilibrium plateau pressure of the alloy, ZrMn2Ni0.6-H2 system, was about 0.5 atm at 30 ℃. Among these alloys, ZrMn2Ni0.6 was the easiest to activate, and it had the largest discharge capacity as well as the best cycling performance. The C14 Laves phase also formed in all alloys of ZrMnNi1+x(x=0.0∼0.4). The equilibrium plateau pressure of the alloy, ZrMnNi1.0-H2 system, was about 0.45 atm at 30 ℃. Among these alloys, ZrMnNi1.0 was the easiest to activate, taking only 3 charge-discharge cycles, and it had the largest discharge capacity of 42 mAh/g. Among all the alloys, ZrMn2Nix(x=0.0∼1.2) andZrMnNi1+x(x=0.0∼0.4), ZrMnNi1.0 had the largest discharge capacity (maximum value of 42 mAh/g), and it showed the fastest activation and good cycling performance.

Ni-MH 2차전지용 AB2계 수소저장합금의 성능개선을 위하여, Zr-Mn-Ni 3성분계 합금으로서 ZrMn2Nix(x=0.0, 0.3, 0.6, 0.9 and 1.2) 합금과 ZrMnNi1+x(x=0.0, 0.1, 0.2, 0.3 and 0.4) 합금을 제작하여 이들의 수소저장특성과 전기화학적 특성을 조사하였다. X-선 회절 분석결과 ZrMn2Nix(x=0.0∼1.2) 모든 조성에서 C14 Laves phase가 형성되었음이 확인되었다. ZrMn2Ni0.6 합금이 equilibrium plateau pressure 는 30 ℃에서 0.5 atm 정도였다. 여러 합금 중에서 ZrMn2Ni0.6 합금이 비교적 활성화가 빨리 이루어졌고, 방전용량이 가장 컸으며, 싸이클 성능이 비교적 우수하였다. ZrMnNi1+x(x=0.0∼0.4) 모든 조성에서 C14 Laves phase가 형성되었다. ZrMnNi1.0 합금의 equilibrium plateau pressure는 30 ℃에서 약 0.45 atm이었다. 여러 합금 중에서 ZrMnNi1.0 합금이 cycle 수 3에서 활성화가 완료되어 가장 큰 방전용량(최대 42 mAh/g)을 나타내었다. ZrMn2Nix(x=0.0∼1.2) 합금과 ZrMnNi1+x(x=0.0∼0.4)합금 들 중에서 ZrMnNi1.0 합금이 가장 큰 방전용량(최대 42 mAh/g)을 가졌으며, 활성화가 가장 빨리 이루어졌고, 싸이클링 성능이 비교적 우수하였다.