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Mussel-Inspired Polydopamine Coating for Enhanced Thermal Stability and Rate Performance of Graphite Anodes in Li-Ion Batteries

Mussel-Inspired Polydopamine Coating for Enhanced Thermal Stability and Rate Performance of Graphite Anodes in Li-Ion Batteries
Park, SH[Park, Seong-Hyo]Kim, HJ[Kim, Hyeon Jin]Lee, J[Lee, Junmin]Jeong, YK[Jeong, You Kyeong]Choi, JW[Choi, Jang Wook]Lee, H[Lee, Hochun]
DGIST Authors
Park, SH[Park, Seong-Hyo]Lee, J[Lee, Junmin]Lee, H[Lee, Hochun]
Issued Date
Article Type
AnodesCoatingsDopamineElectric BatteriesElectrodesElectrolytesFree EnergyGraphiteHigh Rate CapabilityHydrofluoric AcidInterfacial KineticIntrinsic PropertyIonsLithiumLithium-Ion BatteriesLithium AlloysLithium CompoundsMolluscsPolydopamine CoatingSecondary BatteriesSeebeck EffectSolid Electrolyte InterphaseSolid Electrolyte Interphase Layer (SEL)Solid ElectrolytesStabilitySurface Free EnergyThermodynamic Stability
Despite two decades of commercial history, it remains very difficult to simultaneously achieve both high rate capability and thermal stability in the graphite anodes of Li-ion batteries because the stable solid electrolyte interphase (SEI) layer, which is essential for thermal stability, impedes facile Li+ ion transport at the interface. Here, we resolve this longstanding challenge using a mussel-inspired polydopamine (PD) coating via a simple immersion process. The nanometer-thick PD coating layer allows the formation of an SEI layer on the coating surface without perturbing the intrinsic properties of the SEI layer of the graphite anodes. PD-coated graphite exhibits far better performances in cycling test at 60 °C and storage test at 90 °C than bare graphite. The PD-coated graphite also displays superior rate capability during both lithiation and delithiation. As evidenced by surface free energy analysis, the enhanced performance of the PD-coated graphite can be ascribed to the Lewis basicity of the PD, which scavenges harmful hydrofluoric acid and forms an intermediate triple-body complex among a Li+ ion, solvent molecules, and the PD's basic site. The usefulness of the proposed PD coating can be expanded to various electrodes in rechargeable batteries that suffer from poor thermal stability and interfacial kinetics. © 2016 American Chemical Society.
American Chemical Society
Related Researcher
  • 이호춘 Lee, Hochun 에너지공학과
  • 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
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Department of Energy Science and Engineering Electrochemistry Laboratory for Sustainable Energy(ELSE) 1. Journal Articles


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