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研究了快淬、热处理、快淬+热处理制备工艺对铸态(LaCe)1.0(NiCoMnAl)5.0高容量贮氢合金电化学性能的影响。XRD分析表明所有合金均为单相CaCu5型结构,快淬+热处理合金相的成分和结构的均匀性最好。电化学测试结果表明,与铸态合金相比,热处理合金的放电容量和循环性能有所提高,但其倍率性能明显降低;快淬合金的活化性能、放电容量、倍率性能以及循环性能均降低;快淬+热处理合金综合电化学性能最好,具有较好的活化性能、最大的放电容量(344.7mA/g)、最大容量保持率(S100,85.67%)以及较好的倍率性能。
The effects of rapid quenching, heat treatment, quenching and heat treatment on the electrochemical performance of LaCe 1.0 (NiCoMnAl) 5.0 high capacity hydrogen storage alloy were investigated. XRD analysis showed that all alloys were single-phase CaCu5-type structure, quenching + heat treatment of the alloy composition and structure of the best uniformity. The results of electrochemical tests showed that the discharge capacity and cycle performance of the heat-treated alloys were improved compared with those of the as-cast alloys, but the rate performance was obviously decreased. The activation performance, discharge capacity, rate performance and cycle performance of the quenched alloys decreased. The quenching + heat treatment alloy has the best electrochemical performance, good activation performance, the maximum discharge capacity (344.7mA / g), the maximum capacity retention (S100, 85.67%) and good rate performance.