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研究了热处理对富铈Mm(NiCoMnAl)5合金晶体结构和电化学性能的影响,实验发现热处理使合金的X射线衍射峰变尖变窄,表明热处理使合金的成分变得均匀,晶格畸变和缺陷减少;但同时,合金的过电势和充放电电势滞后明显增加,特别是在高电流密度150mA·g-1充放电,合金的充放电电极势之间产生了很大的滞后。扫描电镜结果显示,退火合金比铸态合金的晶粒更大更完整;电化学测试结果表明,热处理后合金电化学容量和循环寿命均降低。
The effects of heat treatment on the crystal structure and electrochemical performance of cerium-rich Mm (NiCoMnAl) 5 alloy were investigated. It was found that the X-ray diffraction peak of the alloy was sharply and narrowed by heat treatment. It was found that the composition of the alloy became homogeneous and the lattice distortion and However, at the same time, the overpotential and charge-discharge potential hysteresis of the alloy obviously increase, especially at the high current density of 150mA · g-1, there is a great hysteresis between the charge and discharge potential of the alloy. Scanning electron microscopy results show that the annealed alloy is larger and more complete than the as-cast alloy. The electrochemical test results show that the electrochemical capacity and cycle life of the alloy decrease after heat treatment.