摘要当代，随着经济的快速发展，氢能源作为一种更有效更环保的能源逐渐登上时代潮流。本文主要研究了冷却方式对La0。85Mg0。15Ni2。75Co1。05 储氢合金相结构及电化学性能的影响。在所研究的La0。85Mg0。15Ni2。75Co1。05 储氢合金中，铸态合金大多存在较为明显的元素偏析而形成多相结构，很难获得单一的 A5B19结构。研究表明，对合金进行适当退火处理可获得79。2%以上的 A5B19相，有利于提高合金成分的均匀性，够降低合金的吸氢粉化倾向，从而提高合金电极的循环稳定性，同时以 Co部分替代Ni使合金具有较好高倍率放电性能来提高合金的电化学性能。开发出储氢合金后如何利用合金内储存的氢能又成为了 新的课题。以贮氢合金为负极材料，氢氧化镍为正极材料的氢化物二次电池 (Ni/MH电池)就是储氢合金最为成功的应用。由于决定镍氢电池性能的主要关键材料是储氢合金电极，为了推动我国镍氢电池的产业化发展，因此进一步的开发出新型高性能、低成本的储氢合金电极材料对具有很重要的意义。本实验通过研究在950℃下冷却4小时，炉冷，油冷不同冷却方式对La0。85Mg0。15Ni2。75Co1。05 储氢合金的影响，以希望提高合金的综合电化学性能。86740

毕业论文关键词：La0。85Mg0。15Ni2。75Co1。05 储氢合金，AB3。8，冷却方式，相结构，电化学性能

Abstract Contemporary, with the rapid economic development, hydrogen as a more efficient and environmentally friendly energy gradually boarded the trend of the times。 This paper studies the effect of cooling method on La0。85Mg0。15Ni2。75Co1。05 phase structure and electrochemical properties of hydrogen storage alloys。 In La5Ni15Co4 hydrogen storage alloys studied, most of the cast alloy segregation exists obvious multi-phase structure is formed, it is difficult to obtain a single A5B19 structure。 Studies have shown that the alloy annealed appropriately receive more than 79。2% of A5B19 phase, help to improve the uniformity of the alloy composition, reduces the tendency enough hydrogen-absorbing alloy powder, thereby improving the cycle stability of the alloy electrode, while part of Co alternative Ni alloy has good high rate discharge performance to improve the electrochemical properties of the alloy。 After the development of hydrogen-absorbing alloy how to use stored hydrogen within the alloy has become a new topic。 Hydrogen storage alloy negative electrode material, nickel hydroxide cathode material hydride secondary battery (Ni / MH battery) is the most successful application of hydrogen storage alloy。 Since the decision NiMH batteries performance is mainly the key material is a hydrogen storage alloy electrode, in order to promote China's industrial development of nickel-metal hydride batteries, so the further development of new high-performance, low-cost hydrogen storage alloy electrode material has a very important significance 。 The experiment of Cooling at 950 ℃ 4 hours, and furnace cooling, oil cooling effects of different ways of cooling the hydrogen storage alloy La0。85Mg0。15Ni2。75Co1。05 to want to improve the overall electrochemical properties of the alloy。

Keywords: La0。85Mg0。15Ni2。75Co1。05 hydrogen storage alloy, AB3。8, cooling method, phase structure, electrochemical properties

目录

第一章 绪论 1

1。1 引言 1

1。2 储氢合金概述 2

1。2。1研究现状 2

1。2 。2发展趋势 2

1。2 。3储氢原理与电化学原理 4

1。3储氢合金的影响因素