( 1. 北京化工大學(xué) 化學(xué)工程學(xué)院, 北京 100029;
2. 北京化工大學(xué) 理學(xué)院， 北京 100029)
摘 要: 用高濃度KClO-KOH混合液在常溫下一步氧化摻鈷球形氫氧化鎳， 通過洗滌和真空干燥得到高純度羥基氧化鎳。 利用掃描電鏡、 X射線衍射和激光粒度儀等對樣品的結(jié)構(gòu)進行了表征， 結(jié)果表明： 樣品為具有球形形貌、 粒徑在220.1~650.9 nm之間的超細羥基氧化鎳晶體。 通過恒流放電實驗研究了3種低鈷羥基氧化鎳的放電性能， 結(jié)果表明， 含鈷1.5％的羥基氧化鎳放電性能最為優(yōu)越， 在60 mA/g放電速率下具有高達280 mA·h/g以上的放電容量。 恒流充放電實驗和循環(huán)伏安實驗表明該羥基氧化鎳具有較好的電化學(xué)可逆性， 在充放電循環(huán)中比容量高達330 mA·h/g。
關(guān)鍵字: NiOOH； 堿性鋅鎳電池； 放電容量； 電化學(xué)性能
WANG Zi-hao1, LIU Xiao-guang2
（ 1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2. Faculty of Science, Beijing University of Chemical Technology,
Beijing 100029, China）
Abstract: Highly pure NiOOH was synthesized through one-step oxidizing spherical NiOOH with low cobalt content by highly concentrated mixture of KClO-KOH and followed by rinsing and vacuum desiccating. Structure characterization of the sample by means of scanning electron microscopy, X-ray diffractrometry and laser grain size tester shows that the sample is crystalline of super fine NiOOH with sizes between 220.1-650.9 nm. Three low Co content NiOOH samples are galvanostatically discharged. The results show that the NiOOH containing 1.5% Co has the optimum properties. The discharge capacity is 280 mA·h/g at a discharge rate of 60 mA/g. The tests of charge/discharge and cyclic voltammetry of the prepared NiOOH express good electrochemical reversibility. The specific capacity during charge/discharge reaches as high as 330 mA·h/g.
Key words: NiOOH; alkaline Zn/Ni battery; discharge capacity; electrochemical performance
