锂镍氧化物的合成和电化学行为研究  

Preparation of lithium nickelate and its electrochemical behaviour

作　　者：解晶莹[1] 尹鸽平[1] 史鹏飞[1] 

机构地区：[1]哈尔滨工业大学应用化学系

出　　处：《电源技术》1997年第5期185-189,共5页Chinese Journal of Power Sources

基　　金：国家自然科学基金

摘　　要：通过不同原材料、温度、时间、气氛、流量等的控制来合成ＬｉＮｉＯ２和ＬｉＮｉ１－ｘＭｘＯ２，通过氧化还原滴定、Ｘ射线衍射等方法分析确定了各种合成物的结构和其中镍元素的价态；并通过充放电特性曲线和循环伏安等方法研究了合成物质的电化学行为。在空气中只能得到Ｌｉ２Ｎｉ８Ｏ１０相，只有在Ｏ２气氛下才能得到ＬｉＮｉＯ２相，虽然并非所有的ＬｉＮｉＯ２相都具有电化学活性。本文合成的ＬｉＮｉＯ２放电容量可达１３０ｍＡｈ／ｇ。文中还研究了镍锰及镍钴混合价控制电极，指出其具有良好的可逆性或较高的放电电位段。研究了ＬｉＮｉＯ２－ＧＩＣｓ电极，它具有极好的可逆性、平稳的放电电压和较大的扩散系数。最后，本文对镍的氢氧化物和锂氧化物的结构和电化学特性作了对比研究，以期对镍氧化物电极有较深刻的认识。The LiNiO 2 and LiNi 1-x M xO 2 (M=Co,Mn) are prepared by optimizing the starting materials,sythesis temperature and time,atmosphere and its flow rate.Redox titration and XRD techniques are used to measure the oxidation state of Ni in lithium nickelate as well as the structure of various final products.Charge discharge cycles and cyclic voltammetry are also carried out to determine the electrochemical behaviour of the final products.Under air condition only Li 2Ni 8O 10 phase could be prepared,the LiNiO 2 needs O 2 atmosphere and not all the LiNiO 2 are electrochemical active.LiNiO 2 prepared in this work has a reversible capacity of about 130mAh/g.Mixed valence control materials of Ni Mn and Ni Co show good recharge ability or higher capacity,and the GICs electrode has good reversibility and relatively high diffusion coefficient.Similarity and difference in structure and electrochemical characteristics between nickel hydroxide and lithium nickelate electrodes are also researched to have good comprehension to the nickel oxide electrode.

关 键 词：锂镍氧化物 镍氢氧化物 电化学行为 

分 类 号：TM241.05[一般工业技术—材料科学与工程]