掺入Ni^(2+)的LiCoO_2结构与电化学性能的研究  

Study on the Structure and Electrochemical Performances of LiCoO_2 Dopped with Ni^(2+)

作　　者：杨华铨[1] 孙宝云[1] 王纲群 李能[1] 张婉静[1] 林炳雄[1] 

机构地区：[1]北京大学化学系,北京100871

出　　处：《物理化学学报》1996年第8期716-720,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金

摘　　要：对LixCo1-yNiyO2-δ系列化合物（x=1）,0＜y＜0．5）的合成条件和它们的非完整结构及其电化学性能间的关系进行了较系统的研究，结果表明Ni2＋掺入ABO2型的化合物中，在取代了Co离子的同时，也以一定的几率分布在A位．并使结构中的A,B和O位都出现一定程度的空位在这种非完整结构中，Co离子具有超高常的平均价态，同时也使Li（Ni）－O和O－O的间距加大，提高了该系列化合物的电导及电池的比容量．The relationship of the synthesis conditions of the materials, modification of their imperfect structure as well as electroehemical performances are investigated systematically for the series of complex oxides LixCo1-yNiyO(2-δ) (x=1, 0<y<0.5). The results indicate that during the substitution of Co ion Ni2+ ion occupies the A site with finite probability. The empties A or B and O sites occur with different proportion when Ni2+ ions are dopped in ABO2 type of LiCoO2. The Co ion have a super-high average valence state and the distance of Li(Ni)-O and O-O increase in the imperfect structure. Therefor, the conductivities of these series of complex oxides and the specific capacity of thebatteries are increased.

关 键 词：化合物 镍 非完整结构 电化学性能 

分 类 号：O614.111[理学—无机化学] O646.5[理学—化学]