权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Control of Mg-Based Hydrogen Storage Alloy Nanocrystallites and Their Surface Modification

镁基储氢合金纳米晶的控制及其表面改性

基本信息

批准号：
09555273
负责人：
IWAKURA Chiaki
金额：
$ 8.9万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

The results obtained in this study for three years are summarized as follows.1. XPS and Raman spectroscopy showed that electron transfer from graphite with π electrons to the oxidized surface Mg by ball-milling weakened the Mg-O bond strength, leading to the formation of the Ni-O bonding. The ratio of metallic Ni to Mg on the MgNi surface was increased by the ball-milling.2. The rate of hydrogen absorption for MgィイD22ィエD2Ni-70 wt.% Ni composite at 30℃ markedly increased in comparison with MgィイD22ィエD2Ni and MgィイD22ィエD2Ni-70 wt.% mixture and the amount of absorbed hydrogen reached H/M of about one within 1 h. In the charge-discharg test, the MgィイD22ィエD2Ni-70 wt.% Ni composite showed markedly high discharge capacity of about 870 mAh g(MgィイD22ィエD2Ni)ィイD1-1ィエD1. The discharge capacity, moreover, increased up to 1080 mAh g(MgィイD22ィエD2Ni)ィイD1-1ィエD1by using Ni powder with the weight ratio of Ni to alloy of 10 instead of Cu powder. The charge-discharge cycle performance was improved by increasing the amount of added Ni powder.3. The charge-discharge cycle performance for MgィイD20.9ィエD2MィイD20.1ィエD2Ni (M=Ti, V) alloys was greatly improved in comparison with MgNi though the initial discharge capacity decreased. This was ascribed to the preference dissolution of V component in alkaline solution for the MgィイD20.9ィエD2VィイD20.1ィエD2Ni alloy and the formation of Ti oxides on the alloys surface for the MgィイD20.9ィエD2TiィイD20.1ィエD2Ni alloy. In addition, MgィイD20.9ィエD2TiィイD2xィエD2VィイD20.1-xィエD2Ni alloy showed cycle performance superior to the MgィイD20.9ィエD2MィイD20.1ィエD2Ni (M=ti, v) alloys due to the synegret effect of V and Ti components.

本研究历时三年，所得结果总结如下：1。XPS和拉曼光谱分析表明，球磨过程中，石墨带π电子向氧化表面Mg的转移减弱了Mg- o键的强度，导致Ni-O键的形成。通过球磨，提高了MgNi表面金属Ni与Mg的比例。氢吸收的速率对MgィイD22摊位ィエD2Ni - 70 wt. %镍复合在30℃明显增加与Mg相比ィイD22摊位ィエD2Ni和MgィイD22摊位ィエD2Ni - 70 wt. %混合物和吸收氢的数量达到H / M内的1 H。在charge-discharg测试中,MgィイD22摊位ィエD2Ni - 70 wt. %镍复合显示明显较高的放电容量约为870 mAh g (MgィイD22摊位ィエD2Ni)ィイD1-1ィエD1。此外，用镍合金质量比为10的镍粉代替铜粉，其放电容量可达1080 mAh g(Mg φ φ D22 φ φ D2Ni) φ φ d1 - φ φ d1。通过增加Ni粉的添加量，提高了电池的充放电循环性能。镁合金（M=Ti， V）的充放电循环性能与MgNi相比有较大提高，但初始放电容量有所降低。这主要是由于Mg φ φ D20.9 φ φ D2V φ φ D20.1 φ φ D2Ni合金的V组分在碱性溶液中优先溶解，而Mg φ φ D20.9 φ φ D2Ti φ φ D20.1 φ φ D2Ni合金的表面形成了Ti氧化物。此外，由于v和ti组分的协同作用，Mg D20.9 D2Ti D2x D2V D20.1-x D2Ni合金的循环性能优于Mg D20.9 D2M D20.1 D2Ni （M=ti, v）合金。