GAO Nong, GU Da-ming, LIU Hui. Research of Density Functional Theory on the System Li_xMO_2(M=Co,Ni)[J]. 2010, 15(6): 9-12.DOI:
对Li_xMO_2(M=Co,Ni)体系的密度泛函理论研究
摘要
LixNiO2作为锂离子二次电池正极材料已经得到相当广泛的实验研究
但理论上的探讨却相对滞后.本文采用第一性原理计算方法
结合实验结果
对LixMO2(M=Co
Ni)体系进行了计算.结果表明
纯相LiNiO2充电时
对Li+的脱出量应当有严格的限制.在x=0.5~1之间
LiNiO2的结构稳定性是可以与LiCoO2相比
而在0~0.5之间
LixNiO2体系明显发生较大的结构改变.可以通过掺杂方法增强x=0~0.5时体系结构稳定性.
Abstract
LiNiO2 is the cathode material for lithium-ion secondary batteries.While the experimental research on LiNiO2 has been done extensively
the theoretical study on this material is relatively inadequate.In this paper
the system of LixMO2(M=Co
Ni) is calculated based on First-Principles Calculation Method
combined with experimental data.The result shows that the amount of Li+deintercalation should be controlled strictly when the pure phase LixNiO2 is charged.When x=0.5~1