非晶态氢氧化镍材料电极理论放电容量估算

Approximate Calculation on Theoretical Discharge Capacity of Amorphous Ni(OH)_2 Electrode

摘要:

采用微乳液快速冷冻沉淀法制备出非晶态氢氧化镍，将其粉体制成微电极作为研究电极，并以Pt电极作为辅助电极，Hg·HgO电极作为参比电极构成三电极体系。通过对非晶态氢氧化镍样品电极过程极化曲线的测试，计算其交换电流密度和极限电流密度，并根据计算结果，估算出非晶态氢氧化镍作为电极活性材料在充放电过程中电极反应转移电子数近似为1．35，理论放电比容量为393．26mAh／g，表明具有较高的电化学容量。

Abstract:

Amorphous nickel hydroxide powder was prepared successfully by the method of micro emulsion deepfreeze deposition. Using tiny electrode of sample powder as researching electrode, Pt as assistant electrode and Hg-HgO as referenced electrode, we tested the polarization curve of amorphous Ni(OH)2 powder and calculated j0 and jd. The resalt showed that the number of electron exchange on charging and discharging was 1.35 according to our approximate calculation, and its theoretical discharge capacity was 393.26 mAh/g, so it has high electrochemical capacity.