Moisture sorption by Carbon Black

Dewey, Charles S.; Lefforge, Paul K.; Cabot, Godfrey L.

doi:10.1021/ie50273a019

Cited by 9 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using Au as the conductive metal instead of commonly used carbon black prevent any side/ decomposition reaction during sintering. Additionally, carbon black has the disadvantage to absorb a significant amount of moisture despite extensive drying (Plummer, 1930;Dewey et al, 1932;Liu et al, 2017), resulting in electrochemical artifacts above 4 V vs. Li + /Li. Gold is inert and stable through a large electrochemical window (Vetter and Berndt, 1958;Jiang et al, 2010) and allows an excellent electronic conductivity.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Electrochemical Stability Window of NASICON-Type Solid Electrolytes

et al. 2021

View full text Add to dashboard Cite

All-Solid-State Lithium Batteries (ASSLBs) are promising since they may enable the use of high potential materials as positive electrode and lithium metal as negative electrode. This is only possible through solid electrolytes (SEs) stated large electrochemical stability window (ESW). Nevertheless, reported values for these ESWs are very divergent in the literature. Establishing a robust procedure to accurately determine SEs’ ESWs has therefore become crucial. Our work focuses on bringing together theoretical results and an original experimental set up to assess the electrochemical stability window of the two NASICON-type SEs Li1.3Al0.3Ti1.7(PO4)3 (LATP) and Li1.5Al0.5Ge1.5(PO4)3 (LAGP). Using first principles, we computed thermodynamic ESWs for LATP and LAGP and their decomposition products upon redox potentials. The experimental set-up consists of a sintered stack of a thin SE layer and a SE-Au composite electrode to allow a large contact surface between SE and conductive gold particles, which maximizes the redox currents. Using Potentiostatic Intermittent Titration Technique (PITT) measurements, we were able to accurately determine the ESW of LATP and LAGP solid electrolytes. They are found to be [2.65–4.6 V] and [1.85–4.9 V] for LATP and LAGP respectively. Finally, we attempted to characterize the decomposition products of both materials upon oxidation. The use of an O2 sensor coupled to the electrochemical setup enabled us to observe operando the production of O2 upon LAGP and LATP oxidations, in agreement with first-principles calculations. Transmission Electron Microscopy (TEM) allowed to observe the presence of an amorphous phase at the interface between the gold particles and LAGP after oxidation. Electrochemical Impedance Spectroscopy (EIS) measurements confirmed that the resulting phase increased the total resistance of LAGP. This work aims at providing a method for an accurate determination of ESWs, considered a key parameter to a successful material selection for ASSLBs.

show abstract

Section: Introductionmentioning

confidence: 99%

Assessing the Electrochemical Stability Window of NASICON-Type Solid Electrolytes

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Recent research by Hakalahti et al investigated the interfacial mechanisms of water vapor sorption into cellulose nanofibril films . Moreover, the sorption of moisture in carbon black has been studied as early as the beginning of the 20th century and was beyond that in the focus of research . The moisture sorption on graphite particles is also in the focus of recent investigations .…”

Section: Introductionmentioning

confidence: 99%

Moisture Adsorption Behavior in Anodes for Li‐Ion Batteries

et al. 2019

View full text Add to dashboard Cite

Excessive moisture adsorbed in electrodes and separators of a Li‐ion battery hampers its performance and is, therefore, removed to a certain amount in a post‐drying process. An insufficient understanding of the process results thereby in high process costs. Cost reductions can only be achieved efficiently with an improved process understanding by modeling this post‐drying process. As process modeling requires knowledge of sorption equilibria of water in the components of the battery, the sorption equilibria of water in different anodes are determined by means of a magnetic suspension balance and compared with different experimental setups. The measured data of the adsorption isotherms are described mathematically and give an impression of the amount of moisture, which is going to adjust at an equilibrium starting from a dry anode. Moreover, the materials of the anode are evaluated for their moisture sorption behavior. It is shown that mass‐weighted sorption equilibria of water in the materials yield a good approximation of equivalent equilibria in the anode. In the investigated anodes, the binder and rheology additive carboxymethyl cellulose (CMC) accounts for the most water uptake.

show abstract

“…It has long been known (45,103,112,113,114,121), that charcoals and activated carbons are covered with carbon-oxygen complexes, the composition of which varies as a function of the method of treatment of the sample. Research on surface complexes of charcoal during the war has been carried out primarily because of the help it might furnish in (a) showing the proper surface treatment to give maximum adsorption of certain gases such as ammonia that are apparently very sensitive to the nature of the charcoal surface, (b) interpreting the aging of base charcoal that from time to time was thought to be taking place on storage under humid conditions, and (c) indicating the type of surface complex that might be most effective in any desired minimizing of the adsorption of water vapor, especially at high relative humidities.…”

Section: A Introductionmentioning

confidence: 99%