泡沫镍电沉积Co-Ce合金镍电极的性能

为了提高动力MH/Ni电池的高倍率充放电性能,在泡沫镍骨架表面电沉积具有针状结构、高比表面积的Co Ce合金,Ce含量为0 19%,用其作镍电极的基板。实验结果表明:600次循环中,镍电极10C充电接受能力平均提高36%,放电比容量平均提高42%。XRD分析显示:Co Ce合金基板表面生成的CoOOH是增加基板与活性物质界面电子导电能力的主要因素。

Surface behavior of pasted nickel electrodes with electrodeposited Co-Ce on substrate

MH/Ni battery for electro-vehicle has become a hot topic of studies. The Co-Ce alloys were electrodeposited on the nickel substrate to modify pasted nickel electrode substrate. SEM and XRD results show that the surface of the substrate contains Co(OH)2 and CoOOH film, and CV shows that modified film can improve electron conductivity capability. The state of charge (SOC) or state of discharge (SOD) curves indicate that Co-Ce modified substrate can enhance Ni electrode charge and discharge performance at high rate. The surface analysis by XPS shows that, the Co(Ⅱ)/Co(Ⅲ) ratio is 76.80/23.19 at the SOD, but the Co(Ⅱ)/Co(Ⅲ) ratio is 57.79/42.21 at the SOC, which indicates that the conductibility of electrodeposited Co-Ce alloys on the nickel substrate is enhanced because CoOOH and Co(OH)2 are created on the substrate surface. The modified surface with CoOOH and Co(OH)2 can enhance the conductibility of electrons between the substrate and active materials, and improve the high rate SOC and SOD ability.

Co-15Ce合金在三种不同气氛下的腐蚀

研究了 70 0℃时 Co- 15 Ce合金在 H2 - CO2 、H2 - H2 S及 H2 - H2 S- CO2 三种混合气氛中的腐蚀行为。Co- 15 Ce合金腐蚀后发生了 Ce的内氧化或形成了复杂的腐蚀产物膜 ,而未出现 Ce的选择性氧化或硫化 ,这主要是合金中存在着两相及 Ce在 Co中极低的溶解度所致。 Co- 15 Ce合金在本实验条件下的氧化 -硫化腐蚀速度低于相同温度、压力下的纯硫化。

Co-15Ce合金在S-O双重氧化剂中的腐蚀

研究ＣO－１５Ｃｅ（质量分数，％，下同）合金在Ｓ－Ｏ双重氧化剂作用下的腐蚀特征，结果表明，在６００及７００℃下该合金均形成了复杂的腐蚀产物膜，包括外层单一的Ｃｏ的硫化物、中间层Ｃｏ的硫化物与Ｃｅ的化合物的混合物区及内层Ｃｅ的内腐蚀区。且Ｃｏ－１５Ｃｅ合金在６００及７００℃氧化一硫化混合气氛中的腐蚀速度低于相同温度、相同Ｏ。