关键词: LaMg₁₁Zr＋200%Ni合金, 硼, 非晶, 电化学性能

Abstract:

Using molten LaMg₁₁Zr as the master alloy, LaMg₁₁Zr＋200%Ni+xB(x=0,2%,5%,10%) amorphous alloys have been prepared by mechanical alloying (MA), and the effect of boron addition on their structure and electrochemical properties has been investigatedThe alloys are amorphous after 20 h ballmilling, and the formation of amorphous alloys is promoted by the boron addition, and the thermal stability is also improved.All the alloys have good electrochemistry activation characteristics, the discharge capacity of the alloy electrodes varies with increasing the boron content.An alloy electrode with a composition of LaMg₁₁Zr＋200%(mass)Ni+2%(mass)B achieves the maximum discharge capacity of 614.2 mAh.g^-1, which is 67% higher than that without B addition.The cycling stability of alloy electrodes is improved with B addition, the capacity retention rate increases from 44.4%(x=0) to 70.4%(x=10%) after 30 chargedischarge cycles, and the high rate dischargeability (HRD) is also improved in some extent with B addition.

Key words: LaMg₁₁Zr＋200%Ni合金, 硼, 非晶, 电化学性能