Hydrogen Storage Properties of the Oxide Proton Conductors and their Application to the Secondary Batteries

为了考察质子导电复合氧化物SrCe <0.95>M <0.05>O &lt;3-δ&gt;（M = Yb，Pr，Tm和Tb）在镍氢电池负极活性材料中的应用，首次采用电化学方法研究了质子导电复合氧化物在碱性溶液中的吸放氢特性。结果发现，该氧化物可以像储氢合金一样电化学地重复吸放氢。吸附-脱附性能的变化取决于掺杂的稀土元素的种类。以SrCe_ Yb_ O_（3-δ）为例，其最大吸放氢量为1.11氢<0.95><0.05><3.72><0.60><0.45>·g-1<0.32>。结果表明，氧化物-合金复合材料可提高镍氢电池负极的活化性能。位于合金颗粒表面腐蚀层中的质子导电氧化物将作为氢原子进入合金的新通道。

In order to check the application of proton conductivity double oxides, SrCe_<0.95>M_<0.05>O_<3-δ>(M = Yb, Pr, Tm and Tb), to anode active materials in nickel-hydrogen batteries, hydrogen absorption-desorption characteristics of the proton conducting oxides were firstly investigated using an electrochemical technique in alkaline solutions. As a result, it was found that the oxide can electrochemically repeat hydrogen absorption and desorption like hydrogen storage alloys. The absorption-desorption performance changes depending on the kind of doped rare earth element. The highest absorption-desorption capacity is 1.11 hydrohen for one formula weight of the oxide in the case of SrCe_<0.95>Yb_<0.05>O_<3-δ>.Subsequently, we attempted to improve activation properties of a hydrogen storage alloy, MmNi_<3.72>Co_<0.60>Mn_<0.45>Al_<0.32>, by mixing the proton conducting oxide. As a result, the oxide-alloy composite was found to enhance the activation performance of anode in Ni-metal hydride battery. The proton conducting oxide lying in the surface corrosion layer of alloy particle would play a role as a new path for hydrogen atoms to go into the alloy.