[J. Mater. Chem. A] 我室赵金保教授和程俊教授发表论文:First-principles study of alkali-metal intercalation in disordered carbon anode materials

发布日期:2019年09月14日   浏览次数:

我室赵金保教授和程俊教授在 J. Mater. Chem. A 上发表论文:First-principles study of alkali-metal intercalation in disordered carbon anode materials

文章链接:https://pubs.rsc.org/en/content/articlelanding/2019/ta/c9ta05453g#!divAbstract

摘要:

Graphite and non-graphitising (“hard”) carbons are important anode materials for battery technologies. The electrochemical intercalation of alkali metals in graphite has been widely studied by first-principles density-functional theory (DFT). However, similar investigations of disordered “hard” and nanoporous carbons have been challenging due to the structural complexity involved. Here, we combine DFT with machine-learning (ML) methods to study the intercalation of alkali metal (Li, Na, K) atoms in model carbon systems over a range of densities and degrees of disorder. We use a stochastic approach to compute voltage–filling profiles, studying the three metal species side-by-side, and we analyse the ionic charges of metal atoms as a function of filling. Our study provides atomic-scale insight into the intercalation of all three alkali metals that are relevant to batteries, and it thereby makes a key step towards the DFT/ML-driven modelling of energy materials.