LiCo_(0.5) Ni_(0.5)O_2的恒流充放电容量模型研究  

Study on the Capacity Model of LiNi_(0.5) Co_(0.5)O_2 in Galvanostatic Charge-Discharge Processes

作　　者：文衍宣[1,2] 郑绵平[2] 童张法[1] 薛敏华[1] 

机构地区：[1]广西大学化学化工学院,南宁530004 [2]中国地质科学院盐湖中心

出　　处：《材料导报》2005年第5期122-124,共3页Materials Reports

基　　金：国家重点科技攻关项目"青藏高愿盐湖矿产资源潜力评价"(97-924-01-03)高值化专题

摘　　要：为研究 LiCo_(0.5)Ni_(0.5)O_2的充放电容量和电流间模型,用高温固相反应合成了性能优良的 LiCo_(0.5)Ni_(0.5)O_2,用一维扩散控制方程 Q=Q_m-(I^2/3·D)·I 描述了 LiNi_(0.5)Co_(0.5)O^2的充放电容量与电流的关系,并用该模型计算了最大可逆容量和扩散系数。恒电流充放电过程的扩散系数和最大可逆容量随循环次数的增加而降低,且与循环次数间存在对数线性关系。In order to get the model between capacity and the current,LiCo_(0.5)Ni_(0.5)O_2 with large capacity and excel- lent cycle life is prepared by solid-state reaction.Equation Q=Q_m-(I^2/3·D)·I is used to describe the relationship be- tween the capacity and the current in the galvanostatic charge/discharge process,which can be named as one dimension equa- tion controlled by diffusion.The maximum reversible charge/discharge capacity(Q_m)and the diffusion coefficient(D)can be obtained from the model.Increasing the cycle numbers,the values of Q_m and D increase.Q_m and D have logarithmic linear re- lationship with cycle numbers.

关 键 词：充放电容量 恒流 固相反应合成 可逆容量 循环次数 充放电过程 控制方程 扩散系数 模型计算 线性关系 系数和 恒电流 

分 类 号：TQ127.11[化学工程—无机化工] TM910.6[电气工程—电力电子与电力传动]