锂(药物)
电解质
阳极
材料科学
密度泛函理论
化学物理
石墨
离子
快离子导体
化学
计算化学
物理化学
电极
复合材料
医学
有机化学
内分泌学
作者
Y. C. Chen,Chuying Ouyang,Lili Song,Zhonggui Sun
摘要
Li2CO3, Li2O, and LiF are three important inorganic components that build up the “compact” layer of the solid electrolyte interphase which adhere tightly to the graphite anode of lithium ion batteries. The electrical conductivity and the lithium ion diffusivity within this layer are relevant to the rate performance of the graphite anode. Using density functional theory, the electronic structures of the three compounds are calculated and lithium migration dynamics are simulated using nudged elastic band method. Results show that all three components have insulating electronic structures, while lithium vacancies create some strongly localized holes that do not contribute much to the electronic conduction. Lithium diffusion in Li2CO3 and Li2O can be very fast when lithium vacancies are available. The energy barriers of lithium migration in Li2CO3 (ranges from 0.227 to 0.491 eV) and Li2O (0.152 eV) are comparable to that in graphite with the help of vacancies. However, lithium migration in LiF (energy barrier 0.729 eV) is much slower even when there are lithium vacancies in the lattice.
科研通智能强力驱动
Strongly Powered by AbleSci AI