制备工艺对(LaCe)_(1.0)(NiCoMnAl)_(5.2)高功率贮氢合金微观结构及电化学性能的影响

Effect of preparation process on the microstructure and electrochemical performances of (LaCe)_(1.0)(NiCoMnAl)_(5.2) high power hydrogen storage alloys

对铸态(LaCe)1.0(NiCoMnAl)5.2高功率合金采用热处理、快淬、快淬+热处理的工艺进行处理。合金通过XRD、SEM、EDS等分析发现无论是铸态还是快淬态合金通过热处理后其相组成和成分组成都变得更加均匀。电化学测试结果表明,不同制备工艺对合金的活化性能无明显影响。铸态合金表现出良好的高倍率性能,其1、3、5和10C HRD分别达到95%、76%、72%和35%。热处理后的铸态合金的循环性能提高,但合金的高倍率性能降低。快淬使合金的各项性能均降低,快淬态合金通过热处理后循环性能显著提高,50次容量保持率达到96.7%,其高倍率性能和铸态合金相当。

The effects of rapid quenching, heat treatment and rapid quenching with heat treatment on the electrochemical performances of casted （LaCe）1.0 （NiCoMnAl）5.2 hydrogen storage alloys were investigated. XRD, SEM and EDS analysis found that the distribution of the elements become more homogenous after heart treatment. The results of electrochemical measurement show that, different preparation processes had negligible influence on the activation performance. The as-cast alloy has the best high power dischargeability （HRD） ,the 1, 3,5 and 10C rate capacity retention of the alloy was 95 %, 76 %, 72 % and 35 %. Compared with the as-cast alloy, after heat treatment, the cycle stability had improved, but the HRD decreased. The electrochemical performance of the quenched alloy has rapidly reduced. The capacity retention after 50 cycles of rapid quenching alloy with heat treatment increased to 96. 7%. The HRDs of the as-cast alloy and rapid quenching alloy with heat treatment were closed.