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A key strategy to form a LiF-based SEI layer for a lithium-ion battery anode with enhanced cycling stability by introducing a semi-ionic C F bond
- Source :
- Journal of Industrial and Engineering Chemistry. 99:48-54
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- A solid electrolyte interphase (SEI) on an anode is a critical issue in lithium-ion batteries because it is related to cycling stability. In this study, we introduce a semi-ionic C F bond on the surface of graphite (SICF) via plasma fluorination to introduce a LiF-based SEI layer on the anode during the first cycle. In the charge-discharge profiles and cyclic voltammetry curves, a peak related to the LiF-based SEI formation was clearly observed for SICF. In particular, SICF had an excellent long-term cycling stability of 98.8% for 100 cycles (1.0 C-rate). From the anodes of the disassembled coin cells, it was found that semi-ionic C F bonds improved the formation of a stable LiF-based SEI layer and decreased the number of side reactions with HF, which was produced from PF5. Moreover, SICF exhibited a lower volume expansion compared to that of the pristine anode and the anode with covalent C F bonds. Therefore, introducing a semi-ionic C F bond via plasma fluorination is a key strategy for forming a LiF-based SEI layer on the graphite anode surface that enhances the cycling stability of lithium-ion batteries.
- Subjects :
- Materials science
General Chemical Engineering
Ionic bonding
02 engineering and technology
Plasma
Electrolyte
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Anode
Chemical engineering
Covalent bond
Graphite
Cyclic voltammetry
0210 nano-technology
Layer (electronics)
Subjects
Details
- ISSN :
- 1226086X
- Volume :
- 99
- Database :
- OpenAIRE
- Journal :
- Journal of Industrial and Engineering Chemistry
- Accession number :
- edsair.doi...........75eebc9d291526b6930a118c842b6ae6