Crystallographic and electrochemical characteristics of melt-spun Ti-Zr-Ni-Cu alloys

摘要

Ti_(44)Zr_(32)Ni_(22)Cu_2 and Ti_(41)Zr_(29)Ni_(28)Cu_2 alloys were prepared by the melt-spinning method. The phase structure was analyzed by X-ray diffraction, and the electrochemical performances of the melt-spun alloys were investigated. The results indicated that the Ti_(44)Zr_(32)Ni_(22)Cu_2 alloy was composed of the icosahedral quasicrystals and amorphous phases, and the Ti_(41)Zr_(29)Ni_(28)Cu_2 alloy comprised icosahedral quasicrystals, amorphous, and Laves phases. The maximum discharge capacity was 141 mAh/g for the Ti_(44)Zr_(32)Ni_(22)Cu_2 alloy and 181 mAh/g for the Ti_(41)Zr_(29)Ni_(28)Cu_2 alloy, respectively. The Ti_(41)Zr_(29)Ni_(28)Cu_2 alloy also showed a better high-rate dischargeability and cycling stability. The better electrochemical properties should be ascribed to the high content of Ni, which was beneficial to the electrochemical kinetic properties and made the alloy more resistant to oxidation, as well as to the Laves phase in the Ti_(41)Zr_(29)Ni_(28)Cu_2 alloy, which could work as the electro-catalyst and the micro-current collector.