Ti基准晶复相材料电极的电化学储氢性能

摘要

通过电弧熔炼和铜辊急冷技术分别制得Ti1.4V0.6Ni准晶材料和V5Ti9Zr26.2Ni38Cr3.5Co1.5Mn15.6Al0.4Sn0.8( VTZN)合金材料,再用球磨法得到Ti1.4V0.6Ni +20％(质量分数)VTZN的复相材料,研究了该复相材料的组织和电化学储氢特性.结果表明,复相材料的相组成包括正二十面体准晶相(l-phase)、面心立方相(FCC)和体心立方相(BCC).复相材料作为镍氢电池负极,在303 K和放电电流密度为30 mA/g条件下,最大放电容量可达310 mA· h/g,放电性能优于Ti1.4V0.6Ni合金负极.%The Ti, 4V06Ni and VsTigZr^ 2Ni3gCr3 5Co, .5Mn,5 6Al04Sn0g( VTZN) alloys were prepared via an arc-melting method followed by the melt-spinning technique. We systematically investigated the structures and electrochemical hydrogen storage performances of Ti, 4 Vo 6 Ni +20% (mass fraction) ball-milled VTZN composite materials. It was found that the icosahedral quasicrystal, FCC ( Ti2 Ni) and BCC structural solid solution coexisted in the resultant composite material. When using such composite materials as Ni-MH battery anodes, the discharge current densities were about 30 Ma/g at 303 K, the maximal electrochemical discharge capacity reaches 310 Ma-h/g. In addition, the electrode of Ti, 4V0 6Ni and VTZN composite showed high-rate discharge ability compared with that of Ti, 4V0 6Ni.