Home > Research > Publications & Outputs > Lithium intercalation edge effects and doping i...

Associated organisational unit

Electronic data

  • TA-ART-12-2019-013862.R1_Proof_revieweraccepted (1)

    Rights statement: © Royal Society of Chemistry 2020

    Accepted author manuscript, 2.97 MB, PDF document

    Embargo ends: 7/04/21

    Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

Links

Text available via DOI:

View graph of relations

Lithium intercalation edge effects and doping implications for graphite anodes

Research output: Contribution to journalJournal article

Published
  • C. Peng
  • M.P. Mercer
  • C.-K. Skylaris
  • D. Kramer
Close
<mark>Journal publication date</mark>28/04/2020
<mark>Journal</mark>Journal of Materials Chemistry A
Issue number16
Volume8
Number of pages9
Pages (from-to)7947-7955
Publication statusPublished
Early online date7/04/20
Original languageEnglish

Abstract

The interface between the electrolyte and graphite anodes plays an important role for lithium (Li) intercalation and has significant impact on the charging/discharging performance of Lithium-Ion Batteries (LIBs). However, atomistic understanding of interface effects that would allow the interface to be rationally optimized for application needs is largely missing. Here we comprehensively study the energetics of Li intercalation near the main non-basal surfaces of graphite, namely the armchair and zigzag edges. We find that edge sites at both surfaces bind Li more strongly than in the bulk of graphite. Therefore, lithiation of these sites is expected to proceed at higher voltages than in the bulk. Furthermore, this effect is significantly more pronounced at the zigzag edge compared to the armchair edge due to its unique electronic structure. The “peculiar” topologically stabilized electronic surface state found at zigzag edges strongly interacts with Li, thereby changing Li diffusion behavior at the surface as well. Finally, we investigate boron (B)/nitrogen (N) doping as a promising strategy to tune the Li intercalation behavior at both edge systems, which could lead to enhanced intercalation kinetics in B/N doped graphite anodes.

Bibliographic note

© Royal Society of Chemistry 2020