Journal
SCIENCE BULLETIN
Volume 67, Issue 15, Pages 1581-1588Publisher
ELSEVIER
DOI: 10.1016/j.scib.2022.07.002
Keywords
Graphite anode; K -ion batteries; Localized high-concentration electrolyte; Interphase modification
Categories
Funding
- National Natural Science Foundation of China [91963118, 52173246]
- Science Technology Program of Jilin Province [20200201066JC]
- 111 Project [B13013]
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By introducing a flame-retardant localized high-concentration electrolyte, a rational solid electrolyte interphase was tailored, effectively preventing solvent decomposition and improving resistance against K-ion transport. As a result, the graphite anode exhibited prolonged cycling capability and excellent capacity retention of up to 92.4% over 1400 cycles.
Although graphite anodes operated with representative de/intercalation patterns at low potentials are considered highly desirable for K-ion batteries, the severe capacity fading caused by consecutive reduction reactions on the aggressively reactive surface is inevitable given the scarcity of effective protecting layers. Herein, by introducing a flame-retardant localized high-concentration electrolyte with retentive solvation configuration and relatively weakened anion-coordination and non-solvating fluorinated ether, the rational solid electrolyte interphase characterized by well-balanced inorganic/organic components is tailored in situ. This effectively prevented solvents from excessively decomposing and simultaneously improved the resistance against K-ion transport.Consequently, the graphite anode retained a prolonged cycling capability of up to 1400 cycles (245 mA h g �1, remaining above 12 mon) with an excellent capacity retention of as high as 92.4%. This is superior to those of conventional and high-concentration electrolytes. Thus, the optimized electrolyte with moderate salt concentration is perfectly compatible with graphite, providing a potential application prospect for K-storage evolution. (c) 2022 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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