Li-ion storage in an amorphous, solid, spheroidal carbon anode produced by dry-autoclaving of coffee oil

作者: Kyungho Kim , Ryan A Adams , Patrick J Kim , Anjela Arora , Enrico Martinez

DOI: 10.1016/J.CARBON.2018.03.013

关键词: Amorphous solidLithium-ion batteryAutoclaveChemical engineeringSublimation (phase transition)AnodeCurrent densityChemical kineticsMaterials scienceFaraday efficiency

摘要: Abstract A facile, one-step, solvent-free ‘dry autoclaving’ synthesis method utilized coffee oil as carbon precursor to obtain micrometer diameter spheroidal particles for lithium ion battery anodes. The morphology resulted from the evaporation of liquid into liquid/gas phase interphase at elevated temperature (700 °C), followed by solid/gas sublimation interactions during cooling (below 350 °C) in a closed autoclave. mechanism formation is proposed considering precursor's composition and chemical autoclaving. solid exhibits 0.85 g cc−1 tap density 5 m2 g−1 surface area. Galvanostatic cycling performed 100 mA g−1 current delivered capacity 290 mAh g−1 after 200 cycles. Battery testing (50 °C) increased (350 mAh cycles 100 mA g−1), but with decreased Coulombic efficiency due faster electrolyte depletion augmented reaction kinetics. spherical structuring are maintained 250 charge-discharge cycles, indicating long term stability Li-ion anode material.

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