氢氧化镍电极材料γ-NiOOH的定量相分析  

Quantitative phase analysis of γ NiOOH in nickel electrode

作　　者：王超群[1] 邢政良[1] 王宁[1] 李国勋[1] 吴伯荣[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《电源技术》1999年第6期328-331,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金!59872006

摘　　要：γ－ＮｉＯＯＨ 是β－Ｎｉ（ＯＨ）２ 的过充电产物，它是在大电流充放电和高电解液浓度等条件下形成的［１］。电极中γ－ＮｉＯＯＨ的生成将导致电极的膨胀（由β－Ｎｉ（ＯＨ）２ 转变成γ－ＮｉＯＯＨ，体积增加４４％ ），使其机械稳定性变差和容量衰减，从而加速了电极的老化和循环寿命的缩短。采用参考强度计算法可以直接、无损地测定氢氧化镍电极材料中γ相的含量，为电极材料的研制与性能控制，提供了重要的参数依据。根据正极材料中存在相的晶体结构参数和原子位置，计算得γ－ＮｉＯＯＨ 的（００３）衍射强度与β－ＮｉＯＯＨ 的（００１）衍射强度之比的参考强度Ｋ＝ ２．８３。As the overcharge product of β Ni(OH) 2, γ NiOOH was formed under the condition of charge/discharge at high current rate and high concentration of electrolyte. Its formation caused the swelling of the nickel electrode, that is, the volume of electrode increased 44% when β Ni(OH) 2 transformed into γ NiOOH. The swelling decreased mechanical stability and capacity of electrode and then accelerated its ageing and shorten its cycle life. By using the “reference intensity ratio” method, the content of γ phase in nickel electrode was measured directly and the important parameter for the research and propriety control of electrode materials was provided. According to the parameter of unit cell structure and the atomic positions of the existing phase in positive material, the reference intensity of the ratio of the γ NiOOH (003) to the diffraction intensity of β NiOOH (001) was calculated as K=2.83.

关 键 词：电极材料 Γ-NIOOH 定量相分析 氢氧化镍 

分 类 号：TM241[一般工业技术—材料科学与工程] TM912.2[电气工程—电工理论与新技术]