Improvement of Hydrogen Storage Alloys as a Negative Electrode in Ni-MH Battery

镍氢电池负极储氢合金的改进

基本信息

批准号：
08650819
负责人：
KAMASAKI Seiji
金额：
$ 1.02万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650819/
关键词：
Ni-MH Battery Hydrogen Storage Alloy Rare Earth Metal based Alloy Surface Analysis La(OH)_3 Whisker Ni-Co Microcrystals Long Life Electrode La(OH)_3ウイスカー Ni-MH二次電池 Ni-Co微結晶

项目摘要

Highly efficient AB_5-type Hydrogen Storage Alloys for Ni-MH Battery Ternary LaNi_<5-X>M_X hydrogen storage alloys, partially substituted Ni by Co or Al, react with the alkaline electrolyte in Ni-MH battery to form La(OH)_3 whiskers and inductively precipitate metallic Ni or Ni-Co microcrystals around the surface of the alloys. Hydrogen storage alloy electrode performances were largely dependent on the electrochemical properties of these new microcrystals.So the LaNi_<5-(a+b)>Co_aAl_b alloys were designed and synthesized accordingly to following course, determinations of (1) Al contents which induce the growth of La(OH)_3 whiskers and the precipitations of microcrystals effectively and (2) Co contents which dominate the electrochemical characteristics of alloy electrodes, and comfirmatively evaluated the electrode performances in Ni-MH battery.With increase of Al contents, the maximum discharge capacities of alloy electrodes decreased, while the capacity decays of them during charge-discharge cycles were suppressed. Moreover, electrochemically nonactive Al_2O_3 formed and dispersed on ths surface of the alloys by an excess of Al substitutions (b>0.4), and difficulties of utilization of charged hydrogens increased. On the other hand, Ni-Co microcrystals of almost same compositions as mother alloys were induced and those of composition Co/Ni*3, which have a homogeneous structure of substitutional solid solutions, were superiorly resistant to corrosion.LaNi_<3.5>Co_<1.1>Al_<0.4> alloys synthesized accordingly to the electrochemical data mentioned above were verified to be haigh capacity and long life (maximum discharge capacity : 320 Ah/kg, degradation : 0.01 Ah・kg^<-1>・cycle^<-1>).

Ni-MH电池三元LANI_ <5-X> M_X氢储存合金的高效AB_5型氢储存合金，通过CO或AL替换为Ni-MH电池中的Ni-MH电池中的Ni反应，形成LA（OH）_3晶须和感应珍贵的金属ni或Ni-CO ni-co或Ni-co Microcys围绕ni-MH电池中的ni反应。 Hydrogen storage alloy electrode performances were largely dependent on the electrochemical Properties of these new microcrystals.So the LaNi_<5-(a+b)>Co_aAl_b alloys were designed and synthesized accordingly to following course, determinations of (1) Al contents which induce the growth of La(OH)_3 whiskers and the precipitations of microcrystals effectively and (2) Co contents which dominate合金电极的电化学特性，并专门评估了Ni-MH电池中的电极性能。随着AL含量的增加，合金电极的最大排放能力降低，而在电荷递减周期中它们的容量衰减被抑制。此外，在合金的Ths表面形成并分散了非活性的非活性AL_2O_3，其过量取代（b> 0.4），并且使用带电氢的难度增加了。另一方面，诱导了与母合金几乎相同组成的Ni-CO微晶。 and those of composition Co/Ni*3, which have a homogeneous structure of substitutional solid solutions, were superiorly resistant to corrosion.LaNi_<3.5>Co_<1.1>Al_<0.4> alloys synthesized accordingly to the electrochemical data mentioned above were verified to be haigh capacity and long life (maximum discharge capacity: 320 Ah/kg, degradation: 0.01 ah・kg^<-1> ・循环^<-1>）。