摘要
共沉淀法合成的层状Li(Ni1-xCox)O2,其中x=0.1,0.2,0.3和1,采用XRD和电化学方法对合成的层状Li(Ni1-xCox)O2进行了研究。研究表明在镍酸锂中随着Co含量的增加,Co的增加改变了镍离子与周围氧离子和锂离子的相互作用,阻止了锂离子择优位离开镍酸锂晶体,因此,在镍酸锂中增加一定Co可以阻止镍酸锂由H1向M相转变。同理,在钴酸锂中增加一定Ni可以阻止钴酸锂由H1向H2相和H2相向M相转变。锂离子择优位离开镍酸锂时,存在J-T效应,使得镍酸锂在脱锂过程中发生H1向M相转变,与镍酸锂不同,由于钴酸锂在锂离子择优位离开钴酸锂晶体时,不存在J-T效应,钴酸锂在脱锂时发生H1向H2相和H2相向M相的转变。
Bedded Li（Ni1-xCox）O2 with x= 0.1, and Co - salt in mixed solution with NaOH as the 0.2, 0.3 and 1 is prepared by co - precipitation of Niprecipitator. The synthetic Li（Ni1-xCox）O2 is investigated by XRD and electrochemical method. The study shows that the interaction of Ni ion with surrounding O ions and Li ions will be changed and prevent Li ions from leaving LiNiO2 choicely with the increasing substitution Co for Ni in LiNiO2. Therefore, as the Co ions increasing, the structure transition of H1 to M will be hindered in LiNiO2. In the same way, the structure transition of H1 to H2 and H2 to M will be hindered in LiCoO2 when the Co ions are substituted by a certain amount of Ni ions. The J - T effect occurs in LiNiO2 when Li ions leaving LiNiO2 choicely and the J - T effect makes the structure of LiNiO2 change from H1 to M in the process of lithium deintercalation. On the contrary, the J - T effect does not occur in LiCo02 when Li ions leaving LiCoO2 choicely, the structure transition of H1 to H2 and Ha to M occurs in LiCoO2 during lithium deintercalation.
出处
《山东科技大学学报（自然科学版）》
CAS
2006年第3期64-67,共4页
Journal of Shandong University of Science and Technology(Natural Science)
基金
青岛自然基金项目(04-2-JZ-102)
