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Lactam derivatives as solid electrolyte interphase forming additives for a graphite anode of lithium-ion batteries

Title
Lactam derivatives as solid electrolyte interphase forming additives for a graphite anode of lithium-ion batteries
Authors
Yoon, S[Yoon, Sujin]Kim, H[Kim, Hyemi]Cho, JJ[Cho, Jeong-Ju]Han, YK[Han, Young-Kyu]Lee, H[Lee, Hochun]
DGIST Authors
Lee, H[Lee, Hochun]
Issue Date
2013-12-15
Citation
Journal of Power Sources, 244, 711-715
Type
Article
Article Type
Article
Keywords
AdditivesCaprolactamDensity Function CalculationsDensity Function TheoryElectrochemical ExperimentsElectrolytes AdditivesElectron-WithdrawingFunctional GroupsGraphiteLi-Ion BatteriesLithium BatteriesOxidation-ReductionProbability Density FunctionSeebeck EffectSolid Electrolyte InterphaseSolid Electrolyte Interphase LayersSolid Electrolytes
ISSN
0378-7753
Abstract
N-substituted caprolactam (CL) derivatives are examined as novel solid electrolyte interphase (SEI)- forming additives for improving the cycle performance of LiCoO2/graphite lithium-ion batteries (LIBs). Our electrochemical experiments and density function calculations reveal that N-substitution of acetyl, methyl, and vinyl functional groups to 3-CL greatly affects the oxidation/reduction reactions of the CL additives. The cyclability of LiCoO2/graphite cells are in the following order: acetyleCL > 3-CL > methyl- CL > no additive > vinyl-CL. The cycle performance of acetyleCL is comparable to that of VC, currently the most widely used SEI-forming additive in LIBs. The excellent performance of acetyleCL is ascribed to the electron withdrawing nature of the acetyl group, which enhances the anodic stability and facilitates the reduction reaction, leading to superior SEI formation at the graphite anode. © 2012 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/3167
DOI
10.1016/j.jpowsour.2012.11.115
Publisher
Elsevier B.V.
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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