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A novel plating process was applied to the surface modification of the metal hydride (MH) electrode of the MH/Ni batteries. The electrode was plated with a thin nickel film about 0.1 μm thick by using multi-arc ion plating technique. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) were used to analyze the electrodes. Influence of the surface modification on the performance of the MH/Ni batteries was studied. It is shown that the surface modification could enhance the electrode conductivity and decrease the batteries ohimic resistance by 28.2%. After surface modification, the discharge capacity of the batteries at 5C (8.5 A) is increased by 212 mA·h and discharge voltage is increased by 0.09 V. The surface modification also improves the cyclic durability of the batteries. The inner pressure of the batteries with modified electrode during overcharging is much lower than that with unmodified electrode. The experimental results demonstrate that this process is an effective way for the surface modification of the electrode of MH/Ni batteries. 相似文献
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利用热化学方法合成了NaFeO2.实验在14mol/L NaOH溶液中分别采用ClO-作为氧化剂和粉末微电极技术对3种Fe(Ⅲ)化合物--Fe2O3、Fe(OH)3和NaFeO2的化学行为以及电化学行为进行了研究,结果表明:在本实验条件下,Fe2O3没有任何化学活性和电化学活性;Fe(OH)3和NaFeO2可以被ClO-氧化生成高铁酸盐,Fe(OH)3发生电化学氧化生成高铁酸盐的反应速度非常微弱并且不能与析氧反应(OER)区分;NaFeO2对OER表现出较高的超电势,并具有选择性电化学生成高铁酸盐的性能,从而认为NaFeO2有希望作为二次高铁电池的充电起始物质.实验考察了温度对其氧化过程的影响. 相似文献
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金属钴对储氢合金电极的表面修饰研究 总被引:2,自引:0,他引:2
运用真空蒸镀法时MH/Ni电池储氢合金电极进行了镀覆金属钴的表面修饰,测试了电池的放电容量、高倍率放电性能、循环寿命和充电时的内压,利用XPS和XRD时电极进行了表面和结构分析。实验结果表明,运用该方法对电极进行表面修饰可以降低电池内阻,提高电池的放电容量和放电电压,极片经过修饰的电池,5C(8.5A)放电容量提高了120mAh,放电平台电压提高了约0.05V,内阻降低了19.3%。极片经过表面镀钴后,显著改善了电池的循环性能,电池500周循环后的放电容量仍为初始容量的94.09/6,同时,电池在充电时的内压有了明显的降低,充电效率有了较大的提高。 相似文献
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以过渡金属乙酸盐原料,通过溶胶-凝胶法制备了两种富锂锰基正极材料Li[Li0.13Co0.61Mn0.26]O2和Li[Li0.2Co0.4-Mn0.4]O2,采用XRD、SEM和电化学技术对所得样品的结构、形貌及电化学性能进行了表征和分析。结果表明富锂锰基材料为层状固熔体,且一次颗粒粒径为纳米级。采用恒电流法研究充电过程中材料电荷转移阻抗的变化,结果表明:在充电过程中富锂锰基正极材料电荷转移阻抗先增大后减小,当SOC大约在30%~50%时Rct达到最大,分别约为2 164~4 341Ω和4 254~6 741Ω,而在其余状态下Rct相对较低。 相似文献