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New Ball-Milled Metal Hydride Electrode for Rechargeable Batteries
노학(Hak Noh),J . O . Strom Olsen,박충년(C . N . Park) 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.1
A new type of anode materials in form of nanocrystalline composite powders has been developed that offers the potential for dramatically improved discharge capacity and initial activation rate. The composites are synthesized by ball milling of two components-a major component (basic component) having high hydrogen capacity and a minor component (surface activator) with good electrocatalytic activity. The capacity increase observed by ball milling with surface activator. The ball-milled composite materials are easier to activate than the non ball-milled basic component.
(Mm) Ni<sub>5</sub>계 수소저장합금의 전극 특성
한동수(D . S . Han),최승준(S . J . Choi),장민호(M . H . Chang),최전(J . Choi),박충년(C . N . Park) 한국수소및신에너지학회 1995 한국수소 및 신에너지학회논문집 Vol.6 No.1
The MmNi-based alloy electrode was studied for use as a negative electrode in Ni-MH battery. Alloys with MmNi_5-<sub>x</sub>M<sub>x</sub>(M=Co,Al,Mn) composition were synthesized, and their electrode charateristics of activation rate, temperature dependence, electrode capacity and cycle life were investigated. With increasing A1 content and decreasing Mn content in the alloys, the discharge capacity increased while the cycle life decreased. As x in MmNi_5-<sub>x</sub>M<sub>x</sub> increased from 1.5 to 2.0, decreasing the Ni content, the discharge capacity, the low temperature property and the rate capability decreased. However its cycle life was improved. Increasing Co content resulted in a prolonged cycle life and decrease of high rate discharge capacity. It can be concluded that the most promising alloy in view of discharge capacity and cycle life is MmNi<sub>3.5</sub>Co<sub>0.7</sub>Al<sub>0.5</sub>Mn<sub>0.3</sub>.