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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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熔体旋淬合金Zr_(0.9)Ti_(0.1)(Ni,Co,Mn,V)_(2.1)的微结构与电化学性能
, PP. 288-293
Keywords: Zr0.9Ti0.1(Ni,Co,Mn,V)2.1合金,XRD衍射,熔体旋淬,循环稳定性
Abstract:
对比研究了熔体旋淬和常规熔铸合金Zr0.9Ti0.1(Ni,Co,Mn,V)2.1的微结构和电化学性能.XRD分析表明:熔体旋淬合金在退火前后的晶体结构和铸态合金一样,均为面心立方结构,由LaveC15相组成;并且随旋淬速度的增加,旋淬合金中的非晶成分越多.电化学测试表明:旋淬合金有较好的活化性能,但其最大放电容量较低,小于280mAh/g;而退火后的旋淬合金需经30次循环才能完全活化,其最大放电容量皆为340mAh/g左右,高于铸态合金和退火前的旋淬合金;在电流密度为300mA/g下进行充放电循环,发现退火后的旋淬合金循环稳定性明显高于铸态合金电极,并且随旋淬速度的增加,循环稳定性越好,经过800次循环后,退火后的40m/s合金容量保持率高达85%,容量衰减率只有6.9%
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