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为了提高合金的放电容量和高倍率放电性能,通过球磨Zr7Ni10合金对Zr0.5Ti0.5Mn0.7V0.2Co0.1Ni1.2合金表面进行改性,并研究了不同Zr7Ni10量和球磨时间对合金的相结构和电化学性能的影响。当采用8%(质量分数)Zr7Ni10进行球磨1h后,合金仍保持晶态,在50mAh/g电流条件下经过9次循环达到最大放电容量266mAh/g,比未球磨合金提高了约20%,而且在300mA/g电流条件下仍能保持最大放电容量的85%。随着球磨时间的增加,合金逐渐转为非晶态,合金的放电容量也迅速降低。非晶化合金在800℃进行热处理后大部分重新晶化,经过22次循环达到最大放电容量200mAh/g。
In order to improve the discharge capacity of the alloy and high rate discharge performance, the surface of Zr0.5Ti0.5Mn0.7V0.2Co0.1Ni1.2 alloy was modified by ball milling Zr7Ni10 alloy, and the phase structure of the alloy with different amount of Zr7Ni10 and milling time was studied And electrochemical performance. When the alloy was ball milled with 8% (mass fraction) Zr7Ni10 for 1h, the alloy remained crystalline and reached the maximum discharge capacity of 266mAh / g after 9 cycles at 50mAh / g, which was about 20% higher than that of the un-milled alloy At 300mA / g current conditions can still maintain the maximum discharge capacity of 85%. With the milling time increases, the alloy gradually into amorphous state, the discharge capacity of the alloy also decreased rapidly. Amorphous alloy after heat treatment at 800 ℃ most of the re-crystallization, after 22 cycles to reach the maximum discharge capacity of 200mAh / g.