Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 29, Pages 34197-34201Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c07222
Keywords
alkyl phosphate; solvated anion; concentrated electrolyte solutions; anion intercalation; dual-ion batteries
Funding
- National Natural Science Foundation of China [21975251]
- National Key Research and Development Program of China [2016YFA0602901]
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The combination of electrolyte salt and solvent is crucial for the electrochemical performance of the graphite electrode in dual-ion batteries, with solvent participating in the anion intercalation process. In Li/graphite DIBs with concentrated LiTFSI-alkyl phosphates solutions, the nearly identical intercalated gallery height is mainly attributed to the size of the TFSI anion and the rigid PO4 framework of the alkyl phosphate solvents.
In dual-ion batteries (DIBs) utilizing organic electrolyte solutions, the combinations of electrolyte salt and solvent serve as a determiner of the electrochemical performance of graphite electrode partially because solvent participates in the anion intercalation procedure. In this case, every solvated-anion@graphite intercalation compound possesses the characteristic intercalated gallery height. However, in Li/graphite DIBs with concentrated LiTFSI (lithium bis(trifluoromethanesulfonimide))-alkyl phosphates (ca. trimethyl, triethyl, tripropyl, tributyl phosphate) solutions, solvated-TFSI @graphite intercalation compounds have the nearly identical intercalated gallery height of about 0.803 nm, which may be mainly attributed to both the big size of TFSI - anion and the rigid PO4 framework of these alkyl phosphate solvents.
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