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    New Insights of Graphite Anode Stability in Rechargeable Batteries: Li-Ion Coordination Structures Prevail over Solid Electrolyte Interphases

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    Type
    Article
    Authors
    Ming, Jun cc
    Cao, Zhen
    Wahyudi, Wandi
    Li, Mengliu cc
    Kumar, Pushpendra
    Wu, Yingqiang
    Hwang, Jang-Yeon
    Hedhili, Mohamed N. cc
    Cavallo, Luigi cc
    Sun, Yang-Kook
    Li, Lain-Jong cc
    KAUST Department
    Chemical Science Program
    KAUST Catalysis Center (KCC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Surface Science
    Date
    2018-01-10
    Online Publication Date
    2018-01-10
    Print Publication Date
    2018-02-09
    Permanent link to this record
    http://hdl.handle.net/10754/626975
    
    Metadata
    Show full item record
    Abstract
    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 Letters
    DOI
    10.1021/acsenergylett.7b01177
    Additional Links
    http://pubs.acs.org/doi/10.1021/acsenergylett.7b01177
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsenergylett.7b01177
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Catalysis Center (KCC)

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