New Insights of Graphite Anode Stability in Rechargeable Batteries: Li-Ion Coordination Structures Prevail over Solid Electrolyte Interphases
Type
ArticleAuthors
Ming, Jun
Cao, Zhen
Wahyudi, Wandi
Li, Mengliu

Kumar, Pushpendra
Wu, Yingqiang
Hwang, Jang-Yeon
Hedhili, Mohamed N.

Cavallo, Luigi

Sun, Yang-Kook
Li, Lain-Jong

KAUST Department
Chemical Science ProgramKAUST Catalysis Center (KCC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Surface Science
Date
2018-01-10Online Publication Date
2018-01-10Print Publication Date
2018-02-09Permanent link to this record
http://hdl.handle.net/10754/626975
Metadata
Show full item recordAbstract
Graphite anodes are not stable in most noncarbonate solvents (e.g., ether, sulfoxide, sulfone) upon Li ion intercalation, known as an urgent issue in present Li ions and next-generation Li–S and Li–O2 batteries for storage of Li ions within the anode for safety features. The solid electrolyte interphase (SEI) is commonly believed to be decisive for stabilizing the graphite anode. However, here we find that the solvation structure of the Li ions, determined by the electrolyte composition including lithium salts, solvents, and additives, plays a more dominant role than SEI in graphite anode stability. The Li ion intercalation desired for battery operation competes with the undesired Li+–solvent co-insertion, leading to graphite exfoliation. The increase in organic lithium salt LiN(SO2CF3)2 concentration or, more effectively, the addition of LiNO3 lowers the interaction strength between Li+ and solvents, suppressing the graphite exfoliation caused by Li+–solvent co-insertion. Our findings refresh the knowledge of the well-known SEI for graphite stability in metal ion batteries and also provide new guidelines for electrolyte systems to achieve reliable and safe Li–S full batteries.Citation
Ming J, Cao Z, Wahyudi W, Li M, Kumar P, et al. (2018) New Insights on Graphite Anode Stability in Rechargeable Batteries: Li Ion Coordination Structures Prevail over Solid Electrolyte Interphases. ACS Energy Letters: 335–340. Available: http://dx.doi.org/10.1021/acsenergylett.7b01177.Sponsors
The research was supported by KAUST. The simulations were performed on the KAUST supercomputer.Publisher
American Chemical Society (ACS)Journal
ACS Energy LettersAdditional Links
http://pubs.acs.org/doi/10.1021/acsenergylett.7b01177ae974a485f413a2113503eed53cd6c53
10.1021/acsenergylett.7b01177