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采用粉末烧结法制备了Ti2.8C0.2Ni2,Ti3Ni1.8C0.2和Ti3Ni2合金,并对其电化学性能进行了研究。结果表明:Ti2.8C0.2Ni2及Ti3Ni1.8C0.2合金在碱性电解液中具有较低腐蚀速率和较好抗粉化性能。因此,Ti2.8C0.2Ni2及Ti3Ni1.8C0.2合金的循环寿命相比Ti3Ni2合金有明显的改善,其容量保持率分别为66.4%和63%,远高于原Ti3Ni2合金(53.4%)。此外,Ti3Ni1.8C0.2合金还具有较高的最大放电容量316.8mAh/g(Ti3Ni2合金为305.3mA/g)。3种合金都具有优异的HRD性能,它们在电流密度为1100mA/g时仍能保持62%以上的HRD。用C取代后合金的HRD得到进一步提高,尤其是Ti3Ni1.8C0.2合金的HRD提升较多。
Ti2.8C0.2Ni2, Ti3Ni1.8C0.2 and Ti3Ni2 alloys were prepared by powder sintering method and their electrochemical properties were studied. The results show that Ti2.8C0.2Ni2 and Ti3Ni1.8C0.2 alloys have lower corrosion rate and better anti-chalking properties in alkaline electrolyte. Therefore, the cycle life of Ti2.8C0.2Ni2 and Ti3Ni1.8C0.2 alloys is obviously improved compared with that of Ti3Ni2 alloy. The capacity retention rates of Ti2.8C0.2Ni2 and Ti3Ni1.8C0.2 alloys are 66.4% and 63%, respectively, much higher than that of the original Ti3Ni2 alloy (53.4%). In addition, Ti3Ni1.8C0.2 alloy also has a higher maximum discharge capacity of 316.8mAh / g (Ti3Ni2 alloy is 305.3mA / g). All three alloys have excellent HRD performance and still retain a HRD of 62% or more at a current density of 1100 mA / g. The HRD of the alloy after C substitution was further improved, especially the HRD increase of Ti3Ni1.8C0.2 alloy.