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Surface Complex Formation between Aliphatic Nitrile Molecules and Transition Metal Atoms for Thermally Stable Lithium-Ion Batteries

Title
Surface Complex Formation between Aliphatic Nitrile Molecules and Transition Metal Atoms for Thermally Stable Lithium-Ion Batteries
Authors
Kim, YS[Kim, Young-Soo]Lee, H[Lee, Hochun]Song, HK[Song, Hyun-Kon]
DGIST Authors
Lee, H[Lee, Hochun]
Issue Date
2014-06-11
Citation
ACS Applied Materials and Interfaces, 6(11), 8913-8920
Type
Article
Article Type
Article
Keywords
Aliphatic NitrileAliphatic NitrilesCarbonate-Based ElectrolytesCathode Active MaterialCathodesChemical BondsCobaltCobalt SurfaceCyanidesElectrolyteElectrolytesElectronegativityElevated TemperatureFunctional GroupsLithium-Ion BatteriesLithium-Ion BatteryLithium BatteriesMoleculesProtecting The SurfaceStrong InteractionThermal StabilityThermodynamic StabilityTransition-Metals Atoms
ISSN
1944-8244
Abstract
Non-flammability of electrolyte and tolerance of cells against thermal abuse should be guaranteed for widespread applications of lithium-ion batteries (LIBs). As a strategy to improve thermal stability of LIBs, here, we report on nitrile-based molecular coverage on surface of cathode active materials to block or suppress thermally accelerated side reactions between electrode and electrolyte. Two different series of aliphatic nitriles were introduced as an additive into a carbonate-based electrolyte: di-nitriles (CN-[CH 2]n-CN with n = 2, 5, and 10) and mono-nitriles (CH 3-[CH2]m-CN with m = 2, 5, and 10). On the basis of the strong interaction between the electronegativity of nitrile functional groups and the electropositivity of cobalt in LiCoO2 cathode, aliphatic mono- and di-nitrile molecules improved the thermal stability of lithium ion cells by efficiently protecting the surface of LiCoO 2. Three factors, the surface coverage θ, the steric hindrance of aliphatic moiety within nitrile molecule, and the chain polarity, mainly affect thermal tolerance as well as cell performances at elevated temperature. © 2014 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/2389
DOI
10.1021/am501671p
Publisher
American Chemical Society
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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