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Al代α-Ni（OH）2的高温电化学性能
High Temperature Electrochemical Performance of Al-substituted α-Ni（OH）2
【Author】 LIU, Yuan-Gang TANG, Zhi-Yuan Xu, Qiang LI, Chang-Sheng (School of Chemical Engineering and Technology, Tianjin University,Tianjin 300072, P. R . China)
【机构】 天津大学化工学院；
【摘要】 本文采用均相沉淀法合成了颗粒尺寸较小的Al代Ni(OH)2,并对Al代Ni(OH)2粉末的微观形貌、晶体结构、化学组成及高温电化学性能进行了研究。结果表明,实验制 Al代Ni(OH)2属于稳态α型结构,微观颗粒由纳米级纤维束组成,其化学式可表示为 Ni0.70Al0.18(OH)1.6(CO3)0.1(SO4)0.07·(H2O)0.6,具有较好的高温充电效率和循环性能,60℃时的析氧电位较高,放电容量比25℃仅衰减15 mAh／g,晶型结构十分稳定,60℃循环95次后仍保持以α相为主的晶态结构。
【Abstract】 The purpose of this study was to explore the synthesis of smaller Al-substituted Ni(OH)2 particles with homogeneous precipitation method and investigate its micro-morphology, crystal structure, chemical composition and electrochemical performance at high temperature. The results showed that stabilized a -phase was obtained for the experimental Al-substituted Ni (OH)2 and the particles were spherical agglomerates of fibrous nanometer scale crystallites. The approximate chemical composition of the product: Ni0.70Al0.18(OH)1.6(CO3)0.1(SO4)0.07·(H2O)0.6.Al-substituted Ni(OH)2 displayed high charging efficiency and well cyclic stability with comparatively high oxygen evolution potential at 60℃. Compared with the behavior at 25℃, its discharging capacity of 60℃ decreased 15 mAh/g. Moreover, after electrochemically cycled at 60℃ for 95 times, the structure of Al-substituted Ni(OH)℃ remained mainly a phase, indicating a nice structural stability.
【Key words】 Al-substituted Ni(OH)2； Crystal Structure； High Temperature Electrochemical Performance；
- 【会议录名称】 第二十七届全国化学与物理电源学术年会论文集
- 【会议名称】第二十七届全国化学与物理电源学术年会
- 【会议时间】2006-11
- 【会议地点】中国广东
- 【分类号】TM910.4
- 【主办单位】中国电子学会化学与物理电源技术分会、中国电工技术学会氢能发电装置专业委员会、中国电工技术学会电池专业委员会、中国化学与物理电源行业协会