论文部分内容阅读
研究了干法、湿法和湿法加添加剂三种制粉工艺对贮氢合金电化学性能的影响 ,结果表明 :制粉工艺对合金粉末的表面形貌、粒度分布、氧含量均存在很大的影响 ,并影响到其电化学性能。当采用湿法制粉工艺时 ,贮氢合金电极的活化性能较干法制粉明显改善 ,若加入一定量的添加剂 ,活化性能进一步提高 ,第一次放电容量即达到2 78mAh·g-1,第二次放电容量达到合金电极的稳定容量 32 2mAh·g-1。湿法制粉对贮氢合金电极的循环稳定性能有一定的负面影响 ,这可能与贮氢合金粉末表面的氧化和细粉相对含量较多有关 ,然而 ,当加入一定量的添加剂以后 ,贮氢合金电极的氧含量得到有效的控制 ,3C充放循环稳定寿命达到 5 0 0次 ,与干法制粉工艺接近。
The effects of dry milling, wetting and wet milling additive on the electrochemical performance of hydrogen storage alloy were studied. The results showed that the surface morphology, particle size distribution and oxygen content of the alloy powder were great The impact, and affect its electrochemical properties. When the wet milling process is used, the activation performance of the hydrogen storage alloy electrode is obviously improved compared with that of the dry powder method. If a certain amount of additive is added, the activation performance is further improved, the first discharge capacity reaches to 2 78 mAh · g -1, The secondary discharge capacity reached the stable capacity of alloy electrode 32 2mAh · g-1. Hydrolytic powder has a certain negative effect on the cycling stability of hydrogen storage alloy electrode, which may be related to the relative content of oxidation and fine powder on the surface of the hydrogen storage alloy powder. However, when a certain amount of additive is added, hydrogen storage The oxygen content of the alloy electrode is effectively controlled, and the 3C life cycle of the charge-discharge cycle reaches 500 times, which is close to the dry milling process.