Robust Solid-Electrolyte Interphase Enables Near-Theoretical Capacity of Graphite Battery Anode at 0.2â
C in Propylene Carbonate-Based Electrolyte.
ChemSusChem
; 13(20): 5497-5506, 2020 Oct 21.
Article
em En
| MEDLINE
| ID: mdl-32743913
ABSTRACT
The formation of a robust solid-electrolyte interphase (SEI) layer at the surface of a graphite anode by electrolyte control is a key technology for high-performance lithium-ion batteries. Although propylene carbonate (PC) offers a lower melting point than ethylene carbonate, its combination with the graphite anode without additive is a worse choice, owing to co-intercalation of PC and Li+ ion into graphite, exfoliation of graphene sheets, and death of the battery. This study reports a graphite anode with an unprecedentedly high initial coulombic efficiency of 94 %, close to theoretical capacity, and excellent capacity retention of 99 % after 100 cycles in a PC-based electrolyte system, even at an unusually high rate of 0.2â
C, which is generally attainable only at a very low rate of below 0.05â
C in commercial electrolyte. The SEI stabilization for a graphite anode in PC-based electrolyte provides a new avenue for high-energy and high-performance batteries in widened range of working temperatures. A strong correlation between anode-electrolyte interfacial stabilization and highly reversible cycling performance is clearly demonstrated.
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MEDLINE
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2020
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Article