Dielectric Polarization of a High-Energy Density Graphite Anode and Its Physicochemical Effect on Li-Ion Batteries
- Authors
- Park, Hyunjung; Shin, Donghyeok; Paik, Ungyu; Song, Taeseup
- Issue Date
- Nov-2017
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Anodes; Electric batteries; Electrodes; Electrolytes; Fluorine compounds; Graphite; Graphite electrodes; Ions; Lithium; Solid electrolytes
- Citation
- INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, v.56, no.46, pp.13776 - 13782
- Indexed
- SCIE
SCOPUS
- Journal Title
- INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
- Volume
- 56
- Number
- 46
- Start Page
- 13776
- End Page
- 13782
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/5362
- DOI
- 10.1021/acs.iecr.7b03797
- ISSN
- 0888-5885
- Abstract
- The high energy density graphite anode for the commercial LIBs has critical problems on Li+-ion kinetics due to decreases both in electrode porosity and electrolyte permeability. To overcome issues, interfaces of graphite particles in the anode are polarized using poly(vinylidene fluoride)-hexafluoropropylene (PVDF-HFP) with the high dielectric constant (ε = 8.4), high solubility with lithium salt, and ability to trap a large amount of liquid electrolyte. The PVDF-HFP treatment promoted electrolyte permeability into the graphite electrode with a high mass loading of 13.8 mg cm–2 and a density of 1.7 g cc–1 (a current density over 5 mA cm–2) which particularly leads to an improvement of capacity retention from 77% of a bare electrode to 95% over 40 cycles. These achievements were attributed not only to the enhancement of the lithium-ion kinetics but also to the stable formation of a solid electrolyte interface (SEI) layer on the graphite surface.
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