层状Li(Ni_(1-x)Co_x)O_2首次可逆行为研究  

Study on the first reversible behavior of the layered Li(Ni_(1-x)Co_x)O_2

作　　者：谷亦杰[1] 孔环[1] 黄小文[1] 崔洪芝[1] 王翠玲[1] 杨智宁[1] 吴惠康 周恒辉[3] 魏清[3] 

机构地区：[1]山东科技大学材料学院,山东青岛266510 [2]青岛澳柯玛集团有限公司新能源材料研发中心,山东青岛266510 [3]北京大学化学与分子工程学院,北京100871

出　　处：《电池工业》2007年第2期90-94,共5页Chinese Battery Industry

基　　金：青岛自然基金项目(编号04-2-JZ-102)

摘　　要：介绍了采用共沉淀法合成层状Li(Ni1-xCox)O2的实验方法,采用XRD和电化学方法对合成的层状Li(Ni1-xCox)O2进行了研究。研究结果表明:Co含量为0.3时首次可逆效率发生突变;Co含量小于0.3时,首次不可逆容量损失主要来自存在于Li层的Ni3+很难还原为Ni2+和Ni层中Ni-O八面体的不均匀膨胀,;Co含量大于0.3时,Ni4+转变为Ni3+过程中,Ni-O八面体不均匀膨胀是造成首次不可逆容量的主要原因。同时,随着Co含量的增加,锂离子脱嵌产生的应变减少也是造成首次不可逆容量减少的原因。With x =0. 1, 0.2, 0.3, 0.5 and 1, Li（Ni1-xCox）O2 was prepared by eopreeipitation of Ni- and Co-sah in mixed solution with NaOI-I. The performance of the layered Li（Ni1-xCox）O2was analyzed with XRD and electrochemical methods. The analysis results pointed out that the reason of the first irreversible capacity loss was that the Ni^3＋ existing in the Li layer was diffieuh to reduce into Ni^2＋ and the extending of the Ni-O oetahedron was unsymmetrical when Co content was less than 0.3. The first irreversible capacity mainly came from the Ni - O oetahedron unsymmetrical extending when Co content was more than 0.3.

关 键 词：锂离子电池 层状Li(Ni1-xCox)O2 首次可逆行为 Ni-O八面体 

分 类 号：TM911.14[电气工程—电力电子与电力传动]