Interfacial Impedance Study of Li-Ion Composite Cathodes during Aging at Elevated Temperatures
作者： Marie Kerlau , Robert Kostecki
DOI: 10.1149/1.2213568
关键词: Chemical engineering 、 Adsorption 、 Electrode 、 Inorganic chemistry 、 Carbon 、 Carbon black 、 Electrolyte 、 Materials science 、 Electrochemistry 、 Scanning electron microscope 、 Ethylene carbonate
摘要: The interfacial impedance behavior of carbon black,LiNi[0.8]Co[0.15]Al[0.05]O[2], and LiFePO[4]composite electrodes duringstorage in 1.2 M LiPF[6], ethylene carbonate/ethyl methyl carbonate 3:7wt percent electrolyte at 45oC was investigated. effect thermalpretreatment (120oC under vacuum) prior to aging on the electrochemicalproperties studied detail. Electrochemicalimpedance measurements, which were carried out periodically duringstorage, showed that (i) electrodes' decreasedsubstantially with heat-treatment time, (ii) rate impedanceincrease upon storage elevated temperatures waspredetermined by parameters, (iii) physicochemicalproperties (carbon black) primarily responsible for theobserved during aging.Scanning electron microscopy, energy-dispersive X-ray, Fouriertransform infrared analysis aged revealed a thin surfacefilm decomposition products. Adsorbed water oxygencontaining surface groups reacted toproduce inorganic organic deposits. thin-film formationon black particles aging, consequently, gradual lossof electronic conductivity within electrode is most likelyresponsible degradation electrochemical performance.
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