Journal
CHEMICAL ENGINEERING JOURNAL
Volume 422, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130526
Keywords
Gel polymer electrolyte; Flame-retardant; Quasi-solid-state Li ion batteries; Electric double layer
Categories
Funding
- National Key Research and Development Program of China [2020YFA0710303]
- National Natural Science Foundation of China [U1905215, 51772053, 51672046]
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This study introduces a novel composited polyethylene glycol (PEG) electrolyte with a dual acceleration conduction effect of Li+ by nano-TiO2 and triethyl phosphate (TEP). The electrolyte showed enhanced lithium ion migration and promoted uniformity of lithium deposition, resulting in improved battery performance.
In recent years, the pursuit of high electrochemical stability and safety are considered as the newly growing and leading trend of next-generation lithium-ion batteries (LIB). The gelation of polymer electrolytes(GPEs) is the most direct and effective way to improve electrochemical performance. Herein, a novel composited polyethylene glycol (PEG) electrolyte is reported with a dual acceleration conduction effect of Li+ by the nano-TiO2 and triethyl phosphate (TEP). The negative ZETA potential of nano-TiO2/PEG internal interface promoted the dissociation of lithium salt by the unstable adsorption in diffusion layer, which enhanced the lithium ion migration and promoted the uniformity of lithium deposition. The flame retardant TEP improved safety performance, adjusted the affinity between EO and Li+, which bestowed it a high discharge 125.7mAh/g at 0.2C, with a low average capacity decay rate of 0.08% per cycle. The well-designed PEG-TEP-TiO2 GPEs showed wide electrochemical window, stable Li+ stripping/plating, smaller voltage polarizations and excellent cycling performance. The new understanding of composite electrolytes provides a powerful avenue for facilitating the gelation-solid-state lithium ion batteries.
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