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Effects of electrolyte-volume-to-electrode-area ratio on redox behaviors of graphite anodes for lithium-ion batteries

Title
Effects of electrolyte-volume-to-electrode-area ratio on redox behaviors of graphite anodes for lithium-ion batteries
Authors
Kang, SJ[Kang, Sung-Jin]Yu, S[Yu, Sunghun]Lee, C[Lee, Chulhaeng]Yang, D[Yang, Dookyong]Lee, H[Lee, Hochun]
DGIST Authors
Kang, SJ[Kang, Sung-Jin]; Lee, H[Lee, Hochun]
Issue Date
2014-09-20
Citation
Electrochimica Acta, 141, 367-373
Type
Article
Article Type
Article
Keywords
AnodesElectrode AreasElectrolytesGraphiteGraphite CompositesLi-Ion BatteriesLithiumLithium-Ion BatteryLithium BatteriesLithium SaltLithium SaltsPyrolytic GraphiteRedox ReactionsSolid Electrolyte InterphaseSolid ElectrolytesTransport Behavior
ISSN
0013-4686
Abstract
This study reports on the crucial effects of the ratio of electrolyte volume to electrode area on redox reactions of graphite anodes for lithium-ion batteries (LIBs). It is found that a pyrolytic graphite edge plane electrode (PGE) exhibits reversible Li+ transport behavior in LiClO4 solution, but shows a suppressed redox reaction in LiPF6 electrolyte. The reversible Li+ transport in LiClO4 is hampered by the presence of trace HF, while the depressed activity in LiPF 6 is improved by adding an HF scavenger, which points to the suppressive effects of HF on the redox behavior of PGE. In addition, the redox activity of PGE in LiPF6 solution is either enhanced by decreasing electrolyte volume or diminished by decreasing surface area. It is also revealed that graphite composite electrodes of practical LIBs are also subject to the influence of HF if an excessive amount of electrolyte is employed. These observations are attributed to the HF-induced formation of a passive LiF layer, which is facilitated at high ratio of electrolyte volume to electrode area. Our results clearly demonstrate that HF impurity significantly suppresses the redox activity of graphite anodes, and that the adverse HF influence becomes predominant at a high electrolyte-to-electrode ratio. © 2014 Elsevier Ltd.
URI
http://hdl.handle.net/20.500.11750/3033
DOI
10.1016/j.electacta.2014.07.090
Publisher
Elsevier Ltd
Related Researcher
  • Author Lee, Ho Chun Electrochemistry Laboratory for Sustainable Energy(ELSE)
  • Research Interests Lithium-ion batteries; Novel Materials for rechargeable batteries; Novel energy conversion;storage systems; Electrochemistry; 리튬이차전지; 이차전지용 신규 전극 및 전해액; 신규 에너지변환 및 저장 시스템; 전기화학
Files:
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Collection:
Energy Science and EngineeringElectrochemistry Laboratory for Sustainable Energy(ELSE)1. Journal Articles


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