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采用还原剂热充电法对La1-xCex(NiCoMnAl) 5合金电极进行预处理。测试了电极的活化性能、最大放电容量、高倍率放电能力和氢的扩散系数 ,利用扫描电镜进行表面形貌观察和表面元素分析。结果发现处理后的合金电极在第二次充放电循环时就能完全活化 ;并且在 90 0mA/g的充放电电流密度下 ,其高倍率放电能力达到 85 %左右 ;合金电极表面出现大量的微裂纹 ,氢在处理后的合金电极中的扩散系数为 ( 2～ 3 )× 10 -9cm2 /s。因此 ,此种表面处理法有利于提高合金电极的活化性能和大电流充放电性能。
La1-xCex (NiCoMnAl) 5 alloy electrode was pretreated by reducing agent thermal charging method. The electrode activation performance, the maximum discharge capacity, the high rate discharge capacity and the hydrogen diffusion coefficient were tested. The surface morphology and surface elemental analysis were carried out by scanning electron microscopy. The results show that the treated alloy electrode can be fully activated during the second charge-discharge cycle, and its high-rate discharge capacity reaches about 85% at a charge-discharge current density of 90 0mA / g. A large number of micro-surfaces appear on the surface of the alloy electrode The diffusion coefficient of hydrogen in the treated alloy electrode is (2~3) × 10 -9 cm 2 / s. Therefore, this surface treatment method is conducive to improve the activation performance of alloy electrodes and high-current charge and discharge performance.